Transcript 9-Front of forearm.ppt
Dr. Ahmed Fathalla Ibrahim
MUSCLES OF FRONT OF FOREARM
•
SUPERFICIAL GROUP (5)
From lateral to medial:
1.
Pronator teres (PT) 2.
3.
4.
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5.
1.
2.
3.
Flexor carpi radialis (FCR) Palmaris longus (PL) (may be absent) Flexor digitorum superficialis FDS) Flexor carpi ulnaris (FCU) DEEP GROUP (3) Flexor pollicis longus (FPL) Flexor digitorum profundus (FDP Pronator quadratus (PQ)
SUPERFICIAL GROUP
• • • •
2.
•
1.
ORIGINS: All 5 muscles have a HUMERAL HEAD (arising from the front of medial epicondyle of humerus: ( common flexor origin ). IN ADDITION: 3 out of 5 muscles have an ULNAR HEAD: PT & FDS : arise from medial border of coronoid process of ulna FCU : arises from medial surface of olecranon process & posterior border of shaft of ulna One muscle has a RADIAL HEAD: FDS : arises from oblique line & anterior border of shaft of radius
SUPERFICIAL GROUP
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ACTIONS & INSERTIONS:
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One pronator of radioulnar joints (PT): produces powerful pronation
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Any muscle acting on radioulnar joint must be inserted into radius
Insertion: middle of lateral surface of shaft of radius (point of maximum curvature)
SUPERFICIAL GROUP
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ACTIONS & INSERTIONS: 3 flexors of wrist joint (FCR, FCU, PL)
Any “carpi” is inserted into metacarpal bone
FCR (flexion + abduction of wrist joint): inserted into 2 nd & 3 rd metacarpal bones FCU (flexion + adduction of wrist joint): inserted into 5 th metacarpal bone (+ pisiform & hamate) PL (flexion of wrist joint): inserted palmar aponeurosis into
SUPERFICIAL GROUP
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ACTIONS & INSERTIONS: One flexor of medial 4 fingers (FDS): produces flexion of proximal interphalangeal & metacarpophalangeal joints of medial 4 fingers Insertion: by 4 tendons into the middle phalanges of medial 4 fingers
SUPERFICIAL GROUP
SUPERFICIAL GROUP
DEEP GROUP
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ALL MUSCLES ARE ATTACHED TO ANTERIOR SURFACE OF SHAFT OF RADIUS AND/OR ULNA
DEEP GROUP
Flexor pollicis longus
• • •
ORIGIN: Middle of anterior surface of shaft of radius (+ interosseous membrane) INSERTION: ACTION: distal phalanx of thumb flexion of interphalangeal & metacarpophalangeal joints of thumb
FLEXOR DIGITORUM PROFUNDUS
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ORIGIN: Upper ¾ of anterior surface of shaft of ulna (+ interosseous membrane)
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INSERTION: by 4 tendons into the distal phalanges of medial 4 fingers ACTION: flexion of distal & proximal interphalangeal + metacarpophalangeal joints of medial 4 fingers
PRONATOR QUADRATUS
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ORIGIN: Lower ¼ of anterior surface of shaft of ulna INSERTION: Lower ¼ of anterior surface of shaft of radius
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ACTION: main pronator of radioulnar joints
DEEP GROUP
DEEP GROUP
NERVE SUPPLY
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ALL MUSCLES OF FRONT OF FOREARM ARE SUPPLIED BY MEDIAN NERVE EXCEPT: 1. FCU 2. MEDIAL HALF OF FDP ULNAR NERVE