Extensor carpi radialis brevis. Pain in the extensor carpi radialis muscle Pain in the extensor carpi radialis longus muscle
68. ROUND PRONATOR BEGINS
On the medial epicondyle of the shoulder
2) on the lateral epicondyle of the shoulder
3) on the olecranon
4) on the block of the humerus
69. ATTACHMENT POINT OF THE SUPERFICIAL FLEXOR OF THE FINGERS
1) proximal phalanx of 2-5 fingers
2) distal phalanx of 2-5 fingers
Middle phalanx 2-5 fingers
4) 2-5 metacarpal bones
70. IN THE THIRD LAYER OF MUSCLES ON THE FRONT SURFACE OF THE FOREARM IS LOCATED
Flexor digitorum profundus
3) pronator quadratus
4) flexor carpi radialis
71. IN THE SECOND LAYER OF MUSCLES ON THE FRONT SURFACE OF THE FOREARM IS LOCATED
2) flexor carpi radialis
Flexor digitorum superficialis
4) flexor pollicis longus
72. THE POINT OF ATTACHMENT OF THE EXTENSOR THUMB BREFUS IS
1) 1st metacarpal bone
Base of the proximal phalanx of the thumb
3) distal phalanx of the thumb
4) head of the proximal phalanx of the thumb
73. THE MUSCLES OF THE EMERGENCY OF THE THUMB RELATE TO
1) palmaris brevis muscle
Brushes
3) first dorsal interosseous muscle
Adductor pollicis muscle
74. THE MUSCLES OF THE EMERGENCY OF THE LITTLE FINGER REFERENCES
1) palmaris longus muscle
2) supinator muscle
Abductor digiti minimi muscle
4) extensor digitorum
75. FUNCTION OF THE VERMIFORM MUSCLES OF THE HAND
1) extension of the proximal phalanges
Flexion of the proximal phalanges
3) adduction of fingers II, IV, V
4) flexion of the middle phalanges
76. IN THE FIRST CHANNEL THE WRISTS ARE LOCATED
Abductor pollicis longus tendon
2) tendon of the long extensor carpi radialis
3) tendon of the extensor pollicis longus
4) tendon of the short extensor carpi radialis
77. THE INTERNAL GROUP OF MUSCLES OF THE PELVIC RELATES
1) gluteus maximus muscle
3) sartorius muscle
Iliopsoas muscle
78. ILIOPSOUMAS MUSCLE ATTACHED
1) to the patella
2) to the greater trochanter
To the lesser trochanter
4) to the intertrochanteric ridge
79. ATTACHMENT POINT OF THE GLUTEUS MAJOR MUSCLE
1) lesser trochanter
2) greater skewer
3) gluteal tuberosity
4) intertrochanteric ridge
80. THE MUSCLES OF THE FEMOR OF THE ANTERIOR GROUP REFERENCES
1) quadriceps muscle
2) pectineus muscle
Quadratus femoris
81. THE MUSCLES OF THE POSTERIOR GROUP REFERENCES
1) gluteus maximus muscle
Biceps femoris
3) sartorius muscle
4) thin muscle
82. THE DEEP LAYER OF THE POSTERIOR GROUP OF THE MUSCLES OF THE CHIB FORM
1) extensor digitorum longus
2) peroneus longus muscle
3) plantaris muscle
Tibialis posterior muscle
83. THE MUSCLES OF THE MEDIAL GROUP ON THE PLANT REFERENCES
Flexor pollicis brevis
2) short extensor pollicis
3) plantaris muscle
4) tibialis posterior muscle
84. THE MIDDLE GROUP OF MUSCLES OF THE PLANTAR SURFACE OF THE FOOT INCLUDES
1) muscle that abducts the little toe
2) short extensor pollicis
Flexor digitorum brevis
4) extensor digitorum brevis
85. THE MUSCLES OF THE DORS OF THE FOOT REFERENCES
1) peroneus brevis muscle
2) plantar interosseous muscles
3) abductor pollicis muscle
Extensor pollicis brevis
86. FEMORAL TRIANGLE LIMITED
Inguinal ligament
2) pectineal ligament
3) pectineus muscle
4) ilium
87. LOCATION OF THE MUSCLE LACUNE
1) greater sciatic foramen
2) lesser sciatic foramen
Behind the inguinal ligament
4) medial to the iliopectineal arch
88. PASSES THROUGH THE MUSCULAR GAP
1) piriformis muscle
Iliopsoas muscle
3) pectineus muscle
4) femoral artery
89. PASSES THROUGH THE GREATER SCITICAL FORANA
2) obturator internus muscle
3) external obturator muscle
Piriformis muscle
90. PASSES THROUGH THE Lesser Ischiatic Foramen
1) iliopsoas muscle
Obturator internus muscle
3) piriformis muscle
4) external obturator muscle
91. THE WALLS OF THE FEMORAL CANAL FORM
1) pectineal ligament
2) transversalis fascia
Femoral vein
4) femoral nerve
92. SUPERFICIAL RING OF THE FEMORAL CANAL LIMITED
1) spermatic cord
2) iliopectineal arch
3) inguinal ligament
Crescent edge of the cribriform fascia
93. THE WALLS OF THE ADRIVING CHANNEL ARE FORMED
Adductor magnus muscle
2) adductor brevis muscle
3) pectineus muscle
4) adductor longus muscle
94. LIMITS THE POPELLETIUM FOSSA
1) quadriceps femoris muscle
Semimembranosus muscle
3) soleus muscle
4) peroneus brevis muscle
95. OPENING INTO THE POPPLITHEAL FOSSA
1) femoral canal
2) obturator canal
3) ankle-popliteal canal
4) superior musculofibular canal
96. CHANNEL CONNECTING WITH THE ANKLE-POPLITHEAL CANAL
1) lower musculofibular canal
2) adductor channel
Superior musculofibular canal
4) femoral canal
97. PARTICIPATES IN THE FORMATION OF THE WALLS OF THE LOWER MUSCULEOFIBULAR CANAL
1) anterior surface of the fibula
2) flexor digitorum longus
Origin: lateral epicondyle, lateral intermuscular septum of the shoulder.
Attachment: base of the second metacarpal bone.
Function: wrist extension, wrist abduction (together with the flexor carpi radialis).
Extensor carpi radialis brevis (m. extensor carpi radialis brevis)(3).
Origin: lateral epicondyle of the humerus, radial collateral and annular ligaments.
Attachment: base of the third metacarpal bone.
Function: wrist extension, wrist abduction.
The ulnar group of the superficial layer includes 3 muscles.
Extensor digitorum (m. extensor digitorum)(4); The tendons of this muscle at the level of the heads of the metacarpal bones are connected to each other by fibrous bundles—intertendinous joints (connexus intertendinineus). At the base of the proximal phalanges, the tendons are divided into 3 legs - 2 lateral and a middle one.
Origin: lateral epicondyle of the humerus, articular capsule of the elbow joint, fascia of the forearm.
Attachment: bases of the distal phalanges (lateral legs of the tendons), bases of the middle phalanges (middle legs) of the II-V fingers.
Function: finger extension, wrist extension.
Extensorlittle finger(m. extensor digiti minimi) (5).
Origin: splits off from the extensor digitorum.
Attachment: base of the distal phalanx of the fifth finger (together with the tendon from the extensor digitorum).
Function: extends the little finger (V finger).
Extensor carpi ulnaris (m. extensor carpi ulnaris)(6) has two heads: humeral and ulnar.
Origin: lateral epicondyle of the humerus, body of the ulna and capsule of the elbow joint.
Attachment: base of the fifth metacarpal bone.
Function: extension of the hand, adduction of the hand (together with the flexor carpi ulnaris).
In the deep layer the posterior group (Fig. 95 b) contains 5 muscles:
Arch support(m. supinator) (1).
Origin: lateral epicondyle of the humerus, crest of the supinator of the ulna, capsule of the elbow joint.
Attachment: upper end of the radius.
Function: rotation of the radius, and with it the hand, outward, supinatio; extension at the elbow joint.
Abductor pollicis longus (m. abductor pollicis longus) (2).
Beginning: middle third of the radius and ulna, interosseous membrane of the forearm.
Attachment: base of the metacarpal bone.
Function: abduction of the thumb, abduction of the hand.
Shortextensor pollicis brevis (m. extensor pollicis brevis)(3).
Origin: radius, interosseous membrane.
Insertion: base of the proximal phalanx of the thumb.
Function: extension of the thumb, abduction of the thumb.
Longextensor pollicis longus (m. extensor pollicis longus)(4).
Origin: ulna and interosseous membrane of the forearm.
Insertion: base of the distal phalanx of the thumb.
Function: extension of the thumb.
Extensorindex finger (m. extensor indicis)(5).
Origin: lower third of the ulna and interosseous membrane of the forearm.
Insertion: middle and distal phalanges (together with the extensor tendon of the digitorum).
Function: extension of the index finger.
Muscles of the hand
M 
the muscles of the hand (Fig. 96 a, b, c) are located on the palmar surface and are divided into three groups: 1-lateral group of muscles that form the eminence of the thumb, or the muscles of the eminence of the thumb (thenar) (muscles of the thumb); 2nd medial group of muscles, forms the eminence of the little finger (hypothenar), or the muscles of the little finger (muscles of the 5th finger); 3middle muscle group, or muscles of the palmar cavity (palmamanus).
Rice. 96. Muscles of the right hand (front view):
A– superficial layer of muscles (tendons of the superficial flexor digitorum are preserved); b– superficial; V– deep layer of muscles of the eminences of the thumb and little finger (interosseous muscles removed)
Lateral group muscles located around the 1st metacarpal bone, acts on the thumb (pollex) and includes 4 muscles:
short muscle, abductor pollicis (m. abductorpollicisbrevis) (1), lies on the lateral side of the eminence of the thumb;
flexor pollicis brevis (m. flexor pollicis brevis)(2) has 2 heads: a) superficial head (caput superficiale); b) deep head (caputprofundum) , the long flexor pollicis tendon (m. flexor pollicis longus) passes between the heads;
muscle that opposes the thumb to the hand (m. opponenspollicis) (3), lies under the m.abductorpollicisbrevis;
adductor pollicis muscle (m. adductorpollicis) (4), has two heads: a) oblique head (caput obliquum); b) transverse head (caput transversum).
The muscles of the lateral group begin from the stretching of the flexors (retinaculumflexorum) and the nearest bones of the wrist, with the exception of the adductor pollicis muscle, starting from the III metacarpal bone, and are attached to the proximal phalanx of the thumb and the sesamoid bones of the metacarpophalangeal joint of the thumb, except for the muscle opponensus thumb of the hand (m.opponenspollicis), which is attached to the metacarpal bone.
Medial group muscles surround the fifth metacarpal bone, act on the little finger (5th finger) and include 4 muscles:
short palmaris muscle (m. palmaris brevis)(5) (vestigial cutaneous muscle);
muscle that abducts the little finger (m. abductor digiti minimi)(6), occupying the most medial position in this muscle group;
short flexor of the little finger (m. flexor digiti minimi brevis)(7);
muscle opposite the little finger (m. opponensdigitiminimi) (8), lying lateral to the previous muscle.
The short palmaris muscle (m.palmarisbrevis) starts from the inner edge of the palmar aponeurosis and the flexor retinaculum.
Attachment: woven into the skin of the eminence of the little finger.
The remaining muscles of the medial group begin from the stretch of the flexors (retinaculum flexorum) and the nearest bones of the wrist (pisiform bone, hook of the hamate) and are attached to the proximal phalanx of the little finger (Vfinger), with the exception of the muscle opponens digitiminimi, which is attached to the V metacarpal bone .
Function: corresponds to the names of the muscles.
Middle group muscles occupy the intermetacarpal spaces, act on the II–V fingers and include 4 lumbrical muscles (musculilumbricales); 3 palmar interosseous muscles (musculiinterosseipalmares) and 4 dorsal interosseous muscles (musculiinterosseidorsales).
Vermiform muscles (muscleslumbricales) (9) connect the tendons of the superficial flexor and extensor of the fingers (4 muscles). Each starts from the radial edge of the corresponding tendon of the deep flexor digitorum and is attached to the dorsal surface of the base of the proximal phalanx of the II-V fingers.
Function: flexion of the main and extension of the middle and distal phalanges of the fingers.
Start : ulnar side II, radial side IV and V metacarpal bones, attachment – capsules of the metacarpophalangeal joints of the II, IV and V fingers.
Function: bringing the II, IV and V fingers to the III finger, flexing their main and extending the middle and distal phalanges.
Dorsal interosseous muscles (musculi inte-rossei dorsales)(Fig. 97 b) – abductors, 4 in number, are located in the I, II, III and IV intermetacarpal spaces.
Each muscle begins with two heads from the surfaces of two adjacent metacarpal bones facing each other and is attached to the proximal phalanges of the II and III fingers on the radial side (1st and 2nd dorsal interosseous muscles), III and IV on the ulnar side (3rd I and 4th muscles).
Function: abduction of the II, III, IV fingers, flexion of their main and extension of the middle and distal phalanges.
Extensor carpi radialis brevis, m. extensor carpi radialis brevis, is somewhat covered by the previous muscle in the proximal section, and in the distal section it is intersected by the abductor and extensor pollicis muscles passing more superficially. The muscle originates from the lateral epicondyle of the humerus, the radial collateral ligament of the annular ligament of the radius. Heading down, it passes into the tendon, which lies next to the tendon of the previous muscle in the sheath of the radial extensor carpi tendon, vagina tendinum mm. extensorum carpi radialium, attached to the base of the third metacarpal bone. At the site of attachment of the tendon lies a small bursa of the short extensor carpi radialis, bursa m. extensoris carpi radialis brevis.
Function: extends the hand and slightly abducts it.
Innervation: n. radialis [(CV)CVI-CVII].
Blood supply: a. radialis, a. recurrent radialis.
- - m. extensor carpi radialis longus, is a fusiform muscle with a narrow tendon, significantly longer than the abdomen...
Atlas of Human Anatomy
- - m. extensor pollicis brevis, located in the lower part of the forearm along the lateral edge of its dorsal surface...
Atlas of Human Anatomy
- - m. extensor hallucis brevis, lies medially from the previous muscle...
Atlas of Human Anatomy
- - m. extensor digitorum brevis, is a flat muscle lying directly on the dorsum of the foot...
Atlas of Human Anatomy
- - m. extensor carpi ulnaris, has a long fusiform abdomen and is located along the inner edge of the dorsal surface of the forearm. The muscle begins with two heads - the brachial and ulnar...
Atlas of Human Anatomy
- - m. flexor carpi radialis, is a long bipinnate flat muscle. Located lateral to all flexors of the forearm...
Atlas of Human Anatomy
- - a groove-shaped depression formed by the bones of the wrist on its palmar surface; in B. z. The finger flexor tendons are located...
Large medical dictionary
- - the space bounded by the carpal groove and the flexor retinaculum...
Large medical dictionary
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Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
- - see List of anat. terms...
Large medical dictionary
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- Brachioradialis muscle; m. brachioradialis.
Surface layer
- Extensor carpi ulnaris, m. extensor carpi ulnaris.
- Extensor digitorum, m. extensor digitorum.
- Extensor of the little finger, m. extensor digiti minimi.
The muscles of the forearm, mm.antebrachii, are divided into three groups according to their position: anterior, lateral (radial) and posterior. In this case, the muscles of the anterior and posterior groups are located in several layers. In the anterior group, the muscles lie in four layers.
First (surface layer)
- Pronator teres, m. pronator teres.
- Flexor carpi radialis, m. flехor carpi radialis.
- Palmaris longus muscle, m. palmaris longus.
- Flexor carpi ulnaris, m. flехor carpi ulnaris.
Second layer
- Superficial flexor digitorum, m. flexor digitorum superficialis.
Third layer
- Flexor digitorum profundus, m
Fourth layer
- Pronator quadratus, m. pronator quadratus
The lateral (radial) group includes:
- Pleradialis muscle; m. brachioradialis.
- Extensor carpi radialis longus, m. extensor carpi radialis longus.
- Extensor carpi radialis brevis, m. extensor carpi radialis brevis.
In the posterior group, the muscles lie in two layers.
Deep layer
- Supinator, m.supinator
- Abductor pollicis longus muscle
Anterior muscle group of the forearm
First (surface) layer
- Pronator teres, m. pronator teres, the thickest and shortest muscle of this layer. It begins with two heads: the larger, humeral head, caput hwnerale, from the epicondylus medialis humeri, septum intermusculare brachii mediale, fascia antebrachii, and the smaller, ulnar head, caput ulnare, originating from the medial edge of the tuberositas ulnae. Both heads form a somewhat flattened abdomen from front to back, which turns into a narrow tendon. The muscle runs obliquely from the inside to the outside and is attached to the middle third of the facies lateralis radii. Action: pronates the forearm and takes part in its flexion. Innervation: n. medianus (C6-C7). Blood supply: muscle branches aa. brachialis, ulnaris, radialis.
- Flexor carpi radialis, m. flexor carpi radialis, bipennate, flat, long muscle. It is located the most lateral of all the forearm flexors. In the proximal part, the muscle is covered only by aponeurosis m. bicipis brachii and m. palmaris longus, and the remaining, large, part of the muscle is covered only by fascia and skin. The muscle begins from the epicondylus medialis humeri, septa intermuscularia and fascia antebrachii and, heading down, passes under the retinaculum flexorum to the base of the palmar surface of the II (III) metacarpal bone. Action: bends and pronates the hand. Innervation: n. medianus [C6-C7-(C8)]. Blood supply: muscle branches a. radialis.
- Palmaris longus muscle, m. palmaris longus, has a short fusiform abdomen and a very long tendon. Lies directly under the skin medially from m. flexor carpi radialis. The muscle originates from the epicondylus medialis humeri, septum intermusculare and fascia antebrachii and, approaching the hand, passes into the wide palmar aponeurosis, aponeurosis palmaris. Action: stretches the palmar aponeurosis and takes part in flexion
Starts with two heads:
a) shoulder, caput humerale, from epicondylus medialis humeri and septum intermusculare;
b) ulna, caput ulnare, from olecranon, two upper thirds of facies dorsalis and
fascia of the forearm .Heading down, the tendon passes under the retinaculum flexorwn and attaches to the os pisiforme. A number of bundles pass into lig. pisometacarpeum u lig. pisohamatum, which are attached to the hamate and V metacarpal bones. Action: bends the hand and participates in its adduction. Innervation: n. ul
n aris (C8, Th1). Blood supply: aa. collaterale, a. brachialis et a. ulnaris.Second layer
Superficial flexor digitorum, m. flexor digitorum superficialis, covered in front m. palmaris longus and m. flexor carpi radialis, leaving a mark on it in the form of furrows. The muscle itself begins with two heads:
a) humeroulnare, caput humeroulnare. long and narrow, from epicondylus medialis humeri et processus coronoideus ulnae;
b) radial, caput radiale. wide and short, from the proximal part of the palmar surface of the radius.
Both heads, uniting together into a common abdomen, end in 4 long tendons. The latter, moving to the hand, lie in the canalis carpi and are attached to the base of the middle phalanges from the index finger to the little finger. At the level of the proximal phalanges, each tendon is divided into two and therefore is attached not at one, but at two points - along the edges of the base of the middle phalanges. Action: bends the middle phalanges of the fingers from the index to the little finger. Innervation: n. medianus (C7-C8 Th1). Blood supply
:ah. radialis et ulnaris.Third layer
- Flexor digitorum profundus, m. flexor digitorum profundus, is a highly developed, flat and wide abdomen, originating from the proximal half of the facies anterior ulnae and membrana interossea. The muscle is directed downwards, passing into 4 long tendons, which, having passed under the retinaculum flexorum, lie in the canalis carpi, located under the tendons of m. flexor digitorum superficialis. Then each of the tendons m. The flexor digitorum profundus passes between the legs of the tendons of the superficial digital flexor, attaching to the bases of the distal phalanges, from the index finger to the little finger. The tendons of the superficial and deep flexor fingers lie in the common synovial vagina of the flexor fingers of the hand, vagina
Fourth layer
The pronator quadratus, m.pronator quadratus, is a thin quadrangular plate of transversely located muscle bundles directly on the membrana interossea. It originates from the distal part of the palmar surface of the ulna and attaches at the same level of the palmar surface of the radius. Action:
pronates the forearm. Innervation: n. medianus (C6-C8). Blood supply: a. interossea anterior.Lateral (radial) muscle group of the forearm
- Brachioradialis muscle, m. brachioradialis, fusiform, occupies the most lateral position. Somewhat below its middle, the muscle passes into a long tendon. It originates from margo lateralis humeri, slightly higher than epicondylus lateralis, and from septum intermusculare brachii laterale. Moving downwards, the muscle attaches to the facies lateralis radii somewhat proximal to the processus styloideus. Action: flexes the arm at the elbow joint and takes part in both pronation and supination of the radius. Innervation: n. radialis [C5-C6 (C7)]. Blood supply aa. collateralis et recurrens radialis.
- Extensor carpi radialis longus, m. extensor carpi radialis longus, a spindle-shaped muscle with a narrow tendon, significantly longer than the abdomen. In its upper part the muscle is slightly covered by m. brachioradialis, in the distal section the tendon of the muscle is oblique, from top to bottom, intersected by m. abductor pollicis longus and m. extensor pollicis brevis. The muscle starts from the epicondylus lateralis and septum intermusculare brachii laterale, goes down, passes into the tendon, which, passing under the retinaculum ex-tensorum, is attached to the base of the dorsal surface of the os metacarpale II. Action: bends the arm at the elbow joint, extends the hand and takes part in its abduction. Innervation: n. radialis (C5-C7). Blood supply: aa. collaterales (a. profundae brachii) et a. rec
Posterior muscle group of the forearm
Surface layer
- Extensor carpi ulnaris, m. extensor carpi ulnaris, has a long fusiform abdomen and is located along the inner edge of the dorsal surface of the forearm. The muscle originates from the epicondylus lateralis humeri, margo posterior ulnae and the articular capsule of the elbow joint. Having passed into a short but powerful tendon enclosed in the sheath of the extensor carpi ulnaris tendon, vagina tendinis m. extensoris carpi ulnaris, the muscle is attached to the base of the dorsal surface of os metacarpale V. Action: retracts the hand to the ulnar side and extends it. Innervation: n. radialis [(C6) C7-C8].Blood supply: a. interossea posterior.
- Extensor digitorum, m. extensor digitorum, has a spindle-shaped abdomen, and in the direction of the muscle bundles it is bipinnate. The muscle lies directly under the skin, closer to the lateral edge of the dorsum of the forearm, and borders on the ulnar side with m. extensor carpi ulnaris and with m. extensor digiti minimi, and with radial - with mm
Deep layer
- Arch support, m. supinator, has the appearance of a thin diamond-shaped plate located at the proximal end of the forearm from its outer-posterior surface. The muscle originates from epicondylus lateralis humeri, crista m. supinatoris ulnae and the articular capsule of the elbow joint, is directed obliquely downwards and outwards, covering the upper end of the radius, and is attached along it from the tuberositas radii to the place of attachment of m. pronator teres.
Latin name extensor - extensor; carpi - wrist; radius - radial; brevis - short.
Muscle of the forearm of the lateral group.
Place of origin- Brachial bone.
Place of attachment- Base of the third metacarpal bone.
Action- Extends the hand.
Innervation- C5- 7.
Blood supply- a. radialis, a. recurrent radialis.
Extensor digitorum / Musculus extensor digitorum
Latin name extensor - extensor; digit - finger.
Part of the surface group. Each digital extensor tendon passes above each metacarpophalangeal joint to form a triangular membranous plate called the extensor sheath or extensor sprain, to which the lumbrical and interosseous muscles of the hand are attached. The extensor of the little finger and the extensor of the index finger are also attached to the membranous plate.
Place of origin- Common extensor tendon from the lateral epicondyle of the humerus.
Place of attachment- Dorsal surfaces of all phalanges of the four fingers.
Action- Extends the fingers (metacarpophalangeal and interphalangeal joints). Participates in the abduction (divergence) of the fingers from the middle finger.
Innervation
Blood supply- Recurrent interosseous artery and posterior interosseous artery through the common interosseous artery (from the ulnar artery).
Example: releasing objects held in the hand.
Extensor pollicis brevis / Musculus extensor pollicis brevis
Latin name extensor - to extend; pollicis - thumb; brevis - short.
Part of the deep muscle group. It lies distal to the adductor pollicis longus muscle, to which it is closely adjacent.
Place of origin- Posterior surface of the radius, distal to the origin of the abductor pollicis longus muscle. Adjacent part of the interosseous membrane.
Place of attachment- Base of the dorsal surface of the proximal phalanx of the thumb.
Action- Extends the thumb. Retracts his wrist.
Innervation- Deep radial (posterior interosseous) nerve C6, 7, 8.
Blood supply- Posterior interosseous artery through the common interosseous artery (from the ulnar artery).
Basic functional movement- Example: opens a finger over a flat object.