Quadrangular space

The quadrangular space (or quadrilateral space [of Velpeau] or foramen humerotricipitale) is one of the three spaces in the axillary space. The other two spaces are: triangular space and triangular interval.[1]

Quadrangular space
Suprascapular and axillary nerves of right side, seen from behind. Quadrangular space is the lateral space, labeled in green at center right. Axillary nerve is visible entering it.
The scapular and circumflex arteries. (Quadrangular space is visible but not labeled. Posterior humeral circumflex artery is visible entering quadrangular space at center right.)
Anatomical terminology

Boundaries

The quadrangular space is defined by:[2]

Contents

It transmits the axillary nerve and posterior circumflex humeral vessels (artery and vein).

Clinical significance

Quadrangular space is a clinically important anatomic space in the arm as it provides the anterior regions of the axilla a passageway to the posterior regions. In the quadrangular space, the axillary nerve and posterior circumflex humeral artery can be compressed or damaged due to space-occupying lesions or disruption in the anatomy due to trauma. Symptoms include axillary nerve related weakness of the deltoid muscle in the case of any significant mass lesions in the quadrangular space.

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gollark: Weirdly, `"0"/"0"` seemingly results in them being converted to numbers instead of going through potatOS's string divison handling.
gollark: Apparently not, since `debug.setmetatable` won't let me override division.
gollark: I should see if I can make it produce a more fun result in potatOS.
gollark: Although potatOS does not, as of yet, expose it as an API.

See also

Additional images
  • Muscles on the dorsum of the scapula, and the Triceps brachii.

References

This article incorporates text in the public domain from page 589 of the 20th edition of Gray's Anatomy (1918)

  1. Krishna, Garg (2010). "7 - Scapula". BD Chaurasia's Human Anatomy (Regional and Applied Dissection and Clinical) Volume 1 - Upper limb and thorax (Fifth ed.). India: CBS Publishers and Distributors Pvt Ltd. p. 81. ISBN 978-81-239-1863-1.
  2. Anatomy photo:03:04-0101 at the SUNY Downstate Medical Center - "Scapular Region: Quadrangular Space of Scapular Region"
  3. Adam Mitchell; Drake, Richard; Gray, Henry David; Wayne Vogl (2005). Gray's anatomy for students. Elsevier/Churchill Livingstone. p. 649. ISBN 0-443-06612-4.
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