Lab3 - Module 2 - Anatomy of the Arm and Forearm: Page 6 of 11
Muscles of the Flexor Forearm - Continued
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| Intermediate group: |
| Add the Flexor Digitorum Superficialis muscle has two heads of origin; HumeroUlnar Head and Radial |
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Origin - HumeroUlnar Head- medial epicondyle of the humerus, ulnar collateral ligament, and coronoid process of the ulna; Radial Head- anterior surface of the radius just distal to the radial tuberosity Insertion - Four long tendons into the middle phalanx of each of the 4 most medial fingers (2 through 5). Innervation - Median Nerve (C7, C8, T1) Action - Finger flexion at the metacarpophalangeal joints and proximal interphalangeal joints, also aids in hand flexion at the wrist |
| Superficial Group: |
| Add the Flexor Carpi Ulnaris muscle has two heads of origin; Humeral Head and Ulnar Head |
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Origin - Humeral Head- medial epicondyle of the humerus, Ulnar Head- medial margin of the olecranon and the posterior border of the ulna Insertion - Pisiform bone. Halmus (Hook) of the Hamate Bone, 5th Metacarpal. The tendon the the flexor carpi ulnaris is a good guide to the ulnar nerve and artery, which are on its lateral side. Innervation - Ulnar Nerve Action - Flexes hand at the wrist and ulnar deviation of the wrist |
| The Palmaris Longus muscle is absent in approximately 20% of the population. It is absent in this 3D cadaver. |
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Origin - Medial epicondyle of the humerus Insertion - Anterior flexor retinaculum and palmar aponeurosis Innervation - Median Nerve Action - Flexes the hand at the wrist and tightens the palmar aponeurosis |
| Add the Flexor Carpi Radialis muscle. |
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Origin - Medial epicondyle of the humerus Insertion - Base of the 2nd metacarpal. The tendon of the flexor carpi radialis can be used as a guide to the radial artery which lies just lateral to it. Innervation - Median Nerve Action - Flexes the hand at the wrist and radial deviation of wrist |
| Add the Pronator Teres muscle has two heads of origin: Humeral Head and Ulnar Head |
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Origin - Humeral Head- medial epicondyle of humerus Ulnar Head- coronoid process of the ulna Insertion - Middle lateral surface of the radius Innervation - Median Nerve Action - Pronates and flexes forearm |