University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

94

Pages:

2
Author:

Mariam A. A.

Forearm Muscles Anterior Compartment Superficial layer Muscle Pronator teres Flexor carpi radialis* Palmaris longus Flexor carpi ulnaris* Flexor digitorum superficialis* Origin Coronoid process of ulna for ulna head and Medial epicondyle of humerus (common flexor origin) for humeral head Medial epicondyle of humerus (common flexor origin) Medial epicondyle of humerus (common flexor origin) Medial epicondyle of humerus (common flexor origin) for humeral head and olecranon and posterior boarder of ulna via aponeurosis for ulna head Medial epicondyle (Common flexor origin and coronoid process) for humeral-ulnar head and superior half of anterior border of radial head Insertion Innervation Function Middle of convexity Median nerve Pronates and flexes of (C6, C7) forearm (At elbow) lateral surface of radius Base of metacarpal 2nd Median (C6, C7) Distal half of flexor retinaculum and apex of palmar aponeurosis Pisiform, hook of hamate, 5th metacarpal Median (C7, C8) nerve Flexes and abducts hand (at wrist) nerve Flexes hand (at wrist) and tenses palmar aponeurosis Ulnar nerve (C7, Flexes and adducts C8) hand (at wrist) Shafts of middle Median phalanges of medial (C7, four digits C8, T1) nerve Flexes middle phalanges at proximal interphalangeal joints of middle four digits; acting more strongly, it. also, flexes proximal phalanges at metacarpophalangeal joints * Extrinsic muscles of the hand Note: Palmaris longus is absent in ~15% of the population Deep layer Muscle Pronator quadratus Origin Distal quarter anterior surface ulna Insertion of Distal quarter of of anterior surface of radius Innervation Anterior interosseous nerve, from median Function Pronates forearm; deep fibres bind radius and ulna together Flexor pollicis longus* Anterior surface of radius and adjacent interosseous membrane Anterior interosseous nerve, from median nerve (C8, T1) Flexor digitorum Proximal three Bases of distal profundus* quarters phalanges of medial and anterior of 2nd and 3rd surfaces of ulna and digits for lateral interosseous part and bases membrane for both of distal lateral and medial phalanges of the parts 4th and 5th digits nerve (C8, T1) Anterior Flexes phalanges of 1st digit interosseous (thumb) nerve, from median nerve (C8, T1) Anterior • Lateral part: flexes interosseous distal phalanges 2 nerve, from and 3 at distal median interphalangeal nerve (C8, T1) for joints lateral part and • Medial part: flexes ulnar nerve (C8 distal phalanges 4 and T1) for and 5 at distal medial head interphalangeal joints