Round pronator
Round pronator , m. Pronator teres, - thick and shortest muscle of this layer. There are two heads in it: a large head, caput humerale, which starts from the medial humerus of the humerus, the medial intermuscular septum of the shoulder and the fascia of the forearm, and the smaller ulnar head, caput ulnare, which lies beneath it and originates from the medial edge of the tuberosity of the ulna. Both heads form a slightly flattened front to back abdomen, passing into a narrow tendon.
The muscle goes obliquely from the inside to the outside and is attached to the middle third of the lateral surface of the radial bone.
Function: penetrates the forearm.
Innervation: n. Medianus (C6 - C7). Supply: aa. Brachialis, ulnaris, radialis.
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