Editing Axilla (section)

== '''Anatomical boundaries:''' (pyramid shape - four walls, a base and an apex) ==

* '''Floor/base:''' axillary fascia, which     extends between the four side-walls: 1) the anterior and posterior     axillary folds; and 2) the serratus anterior and the deep fascia of the     arm.
** The suspensory ligament from      the lower border of pectoralis minor attaches to the fascial floor from      above.
* '''Anterior     wall (anterior axillary fold):''' pectoralis major, pectoralis minor, subclavius,     clavipectoral fascia.
* '''Posterior     wall (posterior axillary fold):''' subscapularis and teres major, and the tendon of     latissimus dorsi.
* '''Medial wall     (chest wall):'''     upper part of serratus anterior, as far down as the fourth rib.
* '''Lateral wall     (arm):''' humerus,     coracobrachialis, biceps brachii.
* '''Apex:''' The opening between axilla     and posterior triangle of neck, between the clavicle, upper border of     scapula, outer border of first rib.
** Apex defined as      costoclavicular ligament in Sabiston