A thick, tubular bone in the upper arm. The humerus head at the upper end forms the shoulder joint with the glenoid cavity of the scapula. The lower end is flattened from front to back, with the lateral and medial epicondyles protruding, between which are the condyles of the humerus, which form the elbow joint with the radius and ulna of the forearm. Below the humerus head are the greater and lesser tuberosities, which taper from below to the body of the bone. This area is called the surgical neck, and along with the upper condyle, it is a common site for fractures. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
上腕にある太い管状の骨。上端の上腕骨頭は,肩甲骨の関節窩とともに肩関節を形成する。下端は前後に平たく,外側および内側上顆が突出し,その間に上腕骨顆があって,前腕の橈骨および尺骨とともに肘関節をつくる。上腕骨頭の下に大結節および小結節があり,その下から骨体部にかけては細くなっている。この部位は外科頸と呼ばれ,顆上部とともに骨折の好発部位である。
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