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Questions and Answers
What forms the upper end (apex) of the axilla?
What are the boundaries of the axilla?
Which muscles form the posterior axillary fold?
What is the function of the axilla?
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What is the lower end (base) of the axilla bounded by?
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Study Notes
Axilla Structure
- The upper end (apex) of the axilla is formed by the Humerus (upper arm bone), Scapula (shoulder blade), and 1st rib.
Boundaries of Axilla
- The axilla is bounded by:
- Medially (inner): By the Serratus anterior muscle and the thoracic cage
- Laterally (outer): By the Humerus and the Coracobrachialis muscle
- Anteriorly (front): By the Pectoralis major and Pectoralis minor muscles
- Posteriorly (back): By the Subscapularis, Teres minor, and Teres major muscles
Posterior Axillary Fold
- The posterior axillary fold is formed by the Latissimus dorsi and Teres major muscles.
Axilla Function
- The axilla serves as a gateway for major blood vessels, nerves, and lymphatics to and from the upper limb.
Base of Axilla
- The lower end (base) of the axilla is bounded by the fascia covering the Axillary fascia and the Pectoralis major muscle.
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Description
Test your knowledge of the axilla with this quiz. Explore the boundaries, structures, and functions of this pyramid-shaped space, which serves as a crucial passage for nerves, blood vessels, and lymph channels.
