Axilla

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Axilla boundaries

Boundaries

Anteriorly:

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  • Pectoralis major.
  • Pectoralis minor.
  • Clavipectoral fascia.

Posteriorly:

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  • Subscapularis
  • Teres major.
  • Latissimus dorsi.

Laterally:

  • Coracobrachialis
  • Short head of Biceps.
  • Upper part of humerus.

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Medially:

  • Upper four ribs with their intercostals muscles.
  • Upper part of serratus anterior muscle.

Base: It is formed by the skin and fascia.

Apex: It is directed upwards and medially towards the neck.

It is bounded by:

In front: By posterior surface of clavicle.

Behind: By superior border of scapula.

Medially: By outer border of first rib.

 

Axillary content

Contents:

  • Axillary artery & its branches.
  • Axillary vein & its tributaries.
  • Lower part of brachial plexus & its infraclavicular branches.
  • Lateral cutaneous branches of 2nd & 3rd intercostals nerve.
  • Terminal part of cephalic vein.
  • Long thoracic nerve.
  • Five groups of axillary lymph nodes and lymph vessels.
  • Axillary fat.

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