Anatomy of Proximal Humerus

File:Emojione 1F3AF.svg - Wikimedia Commons

1. Bony Anatomy

  • Head: Hemispherical, articulates with the glenoid cavity of the scapula.

  • Anatomical neck: Marks the attachment of the joint capsule.

  • Greater tubercle: Attachment of supraspinatus, infraspinatus, teres minor.

  • Lesser tubercle: Attachment of subscapularis.

  • Intertubercular (bicipital) groove: Lodges the long head of the biceps tendon.

  • Surgical neck: Common site for fractures.

2. Vascular Supply

  • Anterior and posterior humeral circumflex arteries, branches of the axillary artery, form the main supply.

  • Arcuate artery provides intraosseous perfusion.

  • Disruption → avascular necrosis (AVN) risk of the humeral head.


3. Nerve Relations

  • Axillary nerve winds around the surgical neck—commonly injured in displaced fractures.


You have completed 9% of the lesson
9%
Previous Activity
Next Activity