Anatomy Notes

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Department
Anatomy and Cell Biology
Course
Anatomy and Cell Biology 3319
Professor
Peter Merrifield
Semester
Winter

Description
Anatomy NotesJan 1912 Muscles of the posterior compartment of the forearm are extensors and supinators Extensorsupinator muscles of the posterior compartment of the forearm The posterior compartment has two layera superficial and deep layer Superficialextensor carpi radialis longus extensor carpi radialis brevis extensor digitorum extensor digiti minimi is part of this extensor carpi ulnaris Deepsupinator abductor pollicis longus extensor pollicis longus extensor indicis extensor pollicis brevis All of these muscles are innervated by the radial nerve or branches of the radial nerve Extensor carpi radialis longus superficial It is parallel to the brachioradialis on the lateral forearm ndOlateral supracondyle ridge of humerus Ibase of 2 metacarpal Actionextends and abducts hand at the wrist joint extends in conjunction with ex carpi ulnaris and abducts in conjunction with flexor carpi radialis Innervationradial nerve C6 C7 Extensor carpi radialis brevis Lies deep to ex carpi radialis longus and is shorter than it Olateral rdepicondyle of humerus Ibase of 3 metacarpal Actionextends and abducts hand at the wrist joint Innervationdeep branch of radial nerve C7 C8 Extensor digitorum superficial It lies medial to the ex carpi radialis brevis and a detached portion of it called the ex digiti minimi extends the little finger It has a long tendon that goes to the digits Olateral epicondyle of humerus Iextensor expansions and distal phalanges of medial four digits digits 25 Actionextends the medial four fingers at the metacarpophalangeal joints prime mover of finger extension and extends hand at the wrist joint Innervationposterior interosseous nerve which is a continuation of the deep branch of radial nerve C7 C8 Extensor carpi ulnaris superficial It is a long muscle and is the most medial of the superficial thposterior muscles Olateral epicondyle of humerus and posterior border of ulna Ibase of 5 metacarpal Actionextends and adducts hand at the wrist joint extends in c
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