Axillary sheath

The axillary sheath is a fibrous sheath that encloses the axillary artery and the three cords of the brachial plexus to form the neurovascular bundle, surrounded by the axillary fat.[1][2] It is an extension of the prevertebral fascia of the deep cervical fascia.

Axillary sheath
Axillary artery and its branches - anterior view of right upper limb and thorax (axillary sheath not labeled, but region is visible)
Anatomical terminology

A brachial plexus nerve block can be achieved by injecting anaesthetic into this area.[3]


This article incorporates text in the public domain from page 586 of the 20th edition of Gray's Anatomy (1918)

  1. Grant's Atlas of Anatomy - 13th edition. p. 511.
  2. Last's Anatomuy, 9th Edt
  3. Ay; Akinci, M.; Sayin, M.; Bektas, U.; Tekdemir, I.; Elhan, A. (2007). "The axillary sheath and single-injection axillary block". Clinical Anatomy. 20 (1): 57–63. doi:10.1002/ca.20270. PMID 16372345.

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