The axilla can be visualized as having a floor, an apex, and four walls (medial, lateral, anterior and posterior). See the figure.
The anterior axillary fold A is made up of the pectoralis major and minor muscles.
The posterior axillary fold P is made up of the latissimus dorsi and teres major muscles
The base faces inferiorly and is formed by the skin and fascia of the concave axilla (armpit). Check out a transverse section of the axilla for its boundaries.
The other boundaries are as listed in the following tables:
Keep in mind that many of the structures found in the axilla can be palpated (felt) or observed visually. In all general physical examinations, the axilla should be carefully examined.
|Table of Pectoral Muscles||Axillary Walls|
Table of Contents for Upper Limb & Back
|This is copyrighted©1999 by Wesley Norman, PhD, DSc|