The object of this thesis on Biceps brachii muscle is to reconguize the deformation of the said muscle by fosakng the tradional idea, and by finding fourth head of the subject muscle, apply the recognition of the deformation in basic practice.
The writer obserbed fourth head of Biceps brachii muscle deformation and summarized as fellows. 1. The region of origin was in regions of major node and minor node of upper arm humerus. 2. Adhered region was connected by long head and short head, and adhered as dense part and tendon membran of the radius. 3. Nerve distribution was controled by musclulo Cutaneous nerve, and muscular branch of brachii atery was distributed. 4. On the region of origin, crassed 30° above 1ong head, and from short head found slip the solid size of the tendon was about 8/1 to 10/1 of long head. 5. On the both sides of right and left, found fourth head which was the deformation of Biceps barchii muscle. 6. On the basic practice, subcutaneous injection apply for Brachii muscle but intramuseullar injection rared.
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