Anatomy and Cell Biology 3319 Lecture : Anatomy Notes
3 Feb 2012
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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. 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 retinaculum. Muscles of the anterior (flexor/pronator) compartment of the arm: superficial pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris.
