Which muscle form middle wall of axilla?

Answer 1

The Axilla (more commonly the armpit) is the gap between the Arm and the Thorax beneath the Glenohumeral (shoulder) joint. It is usually viewed as being a triangular prism, pointing upwards) with no inferior border. Anatomists tend not to refer to the limits of a structure with the term "walls" we find the terms Boundaries or Borders much more apt. There are 4 boundaries of the axilla and can be defined using aither bone or muscle tissue. The posterior; boney border is the Scapula (or shoulder bone) and; muscular border is Susbapularis ("beath the scapula") and sometimes latismuss dorsi is used by subscapularis is the easiest to locates in my opinion. The anterior bones border is the Clavicle (it looks quite high to be considered in the axilla but its the best there is) and; the muscular border is the Pectoralis muscles (the pecs). The lateral; boney border is the Humerus (the bone in the arm) and; muscular border is the long head of the Biceps Brachi (named for the fact that it has two heads). And finally to answer the question, the medial; boney border is the Ribcage and; muscular border is the Serratus anterior.