|superiorly: by the outer border of first rib, superior border of scapula, and posterior border of clavicle|
|medially: serratus anterior and by the ribcage||anteriorly: by the pectoralis major, minor, and subclavius (see also anterior axillary fold) posteriorly: by the subscapularis above, and teres major and latissimus dorsi below (see also posterior axillary fold)||laterally: by the intertubercular sulcus (coracobrachialis and the short head of the biceps brachii are in the axilla.)|
|floor/base: by the skin (visible surface of armpit)|
The contents of the axilla include the axillary vein and artery, as well as the brachial plexus, lymph nodes and fat.
The axilla is one of the four sites (the other three being the mouth, rectum, and ear canal) in which a medical thermometer may be inserted in order to measure body temperature.
In modern Western culture, it is common for women to remove underarm hair for aesthetic reasons, while men tend to keep it. Throughout the feminist movement, previously in the hippie culture, and in some areas of the punk rock scene, some women choose to keep their underarm hair for a variety of reasons, from subversion to egalitarianism to comfort.
A wide variety of deodorant and antiperspirant products are sold for the purpose of mitigating this odor.
The sexual attraction to the underarms is called axillism.
The term "underarm" only refers to the outer surface of the axilla. However, the terms are sometimes used interchangeably in casual contexts.
Colloquially, armpit refers to an object or place which is smelly, greasy or otherwise undesirable.