Axillary space

Axillary space (also known as the axilla, armpit or underarm) is an area on the human body directly under the joint where the arm connects to the shoulder. It also provides the under-arm sweat gland.

Etymology

The term "axilla" is derived from the Latin word "ala", meaning "wing". In the context of the human body, it refers to the area that is wing-like or arched, which is the area under the shoulder joint where the arm connects to the body.

Anatomy

The axillary space is pyramid-shaped and is bordered by the upper thoracic wall and the humerus. It is divided into four spaces by the axillary fascia and the clavipectoral fascia. These spaces are the anterior axillary space, the medial axillary space, the posterior axillary space, and the lateral axillary space.

The axillary space contains several important structures including the axillary artery, the axillary vein, the brachial plexus, and several groups of lymph nodes.

Clinical significance

The axillary space is of clinical significance due to its contents. The axillary artery and vein are major blood vessels that supply the upper limb. The brachial plexus is a network of nerves that control the muscles of the upper limb and provide sensation. The lymph nodes in the axilla are often checked in the diagnosis and staging of breast cancer.

Related terms

• Axillary artery
• Axillary vein
• Brachial plexus
• Lymph nodes

See also

• Anatomy
• Human body
• Breast cancer

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  Axillary space