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Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesJan 1712 The number of muscles increases as you go down the forearm and this helps the hand produce finer movements The anterior muscles of the forearm are in anatomical position and they are flexors The interosseous membrane between the radius and ulna is important for separating the anterior and posterior compartments and it helps hold the two bones together Compartments divide the muscles according to function The anterior compartment of the forearm flexes the wrist and fingers brings wrist down bends fingers The posterior compartment of the forearm extends the wrist and fingers Most flexors in the anterior compartment originate from a common tendon on the medial epicondyle of the humerus The flexors are mostly innervated by the median nerve as well as the ulnar nerve The tendons of insertion of the flexors are held in place at the wrist by a thickening of deep fascia called retinaculumMuscles of the anterior flexorpronator compartment of the arm Superficialpronator teres flexor carpi radialis palmaris longus flexor carpi ulnaris Middleflexor digitorum superficialis Deepflexor digitorum profundus flexor pollicis longus pronator quadratus Odd musclebrachioradialis Anterior forearmsuperficial layer Four major muscles emerge from the common flexor origin medial epicondyle of the humeruspronator teres flexor carpi radialis palmaris longus and flexor carpi ulnaris in order from lateral to medial The brachioradialis is an oddity because it receives innervation from the radial nerve and only the lateralis innervated by the medial nerve The radial nerve typically serves extensor muscles Even though the bulk of the muscle is visible in the anterior compartment of the forearm it is technically a posterior compartment muscle Pronator teres superficial Is a twoheaded muscle and the shorte
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