# Axillary space
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> Source: https://en.wikipedia.org/wiki/Axillary_space
> Source revision: 1266692860
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{{Infobox anatomy
|Name = Axillary space
|Latin = spatium axillare
|Image=File:Axillary space.png
|Caption = Axillary Spaces
|Function = [Anatomic space](/source/Spatium) through which contents leave the axilla.
|Image2 =
|Caption2 =
|System =
}}
The '''axillary spaces''' are [anatomic spaces](/source/Spatium).[{{cite book|author1=Scott L. Spear|author2=Shawna C. Willey|title=Surgery of the breast: principles and art|url=https://books.google.com/books?id=AwE_0ZmqiL4C&pg=PA131|accessdate=17 July 2010|year=2006|publisher=Lippincott Williams & Wilkins|isbn=978-0-7817-4756-1|pages=131–}}] through which axillary contents leave the axilla.[{{Cite web|url=https://www.amboss.com/us/knowledge/Shoulder,_axilla,_and_brachial_plexus|title=Shoulder, axilla, and brachial plexus – Knowledge for medical students and physicians|website=www.amboss.com|language=en-US|access-date=2020-01-01|archive-date=2020-01-01|archive-url=https://web.archive.org/web/20200101191644/https://www.amboss.com/us/knowledge/Shoulder,_axilla,_and_brachial_plexus|url-status=dead}}] They consist of the [quadrangular space](/source/quadrangular_space), [triangular space](/source/triangular_space), and [triangular interval](/source/triangular_interval). It is bounded by [teres major](/source/teres_major), [teres minor](/source/teres_minor), medial border of the [humerus](/source/humerus), and long head of [triceps brachii](/source/triceps_brachii).[{{cite book|last1=Krishna|first1=Garg|title=BD Chaurasia's Human Anatomy (Regional and Applied Dissection and Clinical) Volume 1 - Upper limb and thorax|date=2010|publisher=CBS Publishers and Distributors Pvt Ltd|location=India|isbn=978-81-239-1863-1|pages=81, 82|edition=Fifth|chapter=7 - Scapula}}]
They should not be confused with the true "axillary space" within the borders of the axilla.
==Structure==
===Axilla===
The true axilla is a conical space with its apex at the Cervico-axillary Canal, Base at the axillary fascia and skin of the armpit. When viewed in an axillary plane (axillary cut), it is more triangle with: '''Medial Wall:''' Serratus Anterior, '''Anterior Wall:''' pectoral muscles, '''Posterior Wall:''' subscapularis muscle, where the "apex" of the triangle is the humerus[{{Cite web|url=http://sarcoma.org/publications/OTOS_Book/13282_ON-13.pdf|title=Axillary Space Exploration and Resections|last=|first=|date=|website=|url-status=live|archive-url=https://web.archive.org/web/20180403152825/http://sarcoma.org:80/publications/OTOS_Book/13282_ON-13.pdf |archive-date=2018-04-03 |access-date=2020-01-01}}][{{Cite web|url=https://slideplayer.com/slide/6391629/|title=Anatomy of the Axilla Dr Rania Gabr. - ppt video online download|website=slideplayer.com|access-date=2020-01-01}}]
===Quadrangular space ===
This space is in the posterior wall of the axilla. It is a quadrangular space bounded laterally by surgical neck of the humerus, medially by long head of triceps brachii and inferiorly by [teres major](/source/teres_major). It is bounded superiorly by [subscapularis](/source/subscapularis) in front, capsule of the shoulder joint in the middle, and behind by [teres minor](/source/teres_minor). The [axillary nerve](/source/axillary_nerve) and [posterior humeral circumflex artery](/source/posterior_humeral_circumflex_artery) and vein pass through this space.