Boundaries of the Axilla

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What is the Axilla?

The axilla is a space surrounded by four walls in the shape of a pyramid. It has six boundaries:

Boundaries of the Axilla:

Apex:

• The apex is located at the first rib between the clavicle (anteriorly) and the acromion of the scapula (posteriorly).

Base:

• Skin and fascia of the armpit.

Medial Wall:

• The rib cage (ribs 1-4), and the serratus anterior.

Lateral Wall:

• The intertubercular groove of the humerus.

Anterior Wall:

• Pectoralis major and minor muscles.

Posterior Wall:

• The scapula, teres major, latissimus dorsi, and subscapularis.

Chapters on Shoulder Anatomy:

1. Arteries of the Axilla
2. Arteries of the Shoulder Girdle
3. Axillary Artery Aneurysm
4. Axillary Fat and Fascia
5. Axillary Nerve Block
6. Bones and Fractures of the Upper Limb
7. Boundaries of the Axilla
8. Breast Cancer and Axillary Lymph Nodes
9. Erb-Duchenne Palsy
10. Joints of the Shoulder Girdle
11. Klumpke's Paralysis
12. Lymph Nodes of the Axilla
13. Muscles of the Axilla
14. Muscles of the Shoulder Girdle
15. Notes on Shoulder Bursae
16. Roots and Trunks of the Brachial Plexus
17. Winged Scapula in Computer Programmer
18. Transient Axillary Paralysis
19. Variation of Brachial Plexus Structure
20. Veins of the Axilla

Additional Reading:

Histology and Cytology

1. Cell Components
2. Nervous Tissue
3. Muscle Tissue
4. Lymphoid Tissue
5. Integument
6. Respiratory System
7. Gastrointestinal System
8. Renal/Urinary System
9. Male Reproductive System
10. Female Reproductive System

Gross Anatomy

1. Back and Nervous System
2. Thorax
3. Abdomen, Pelvis, and Perineum
4. Upper Limb
5. Lower Limb
6. Head and Neck
7. Chest Wall
8. Shoulder

Anatomy Videos

1. Video of Musculoskeletal Examination in a Clinical Setting
1. Video of HEENT Examination in a Clinical Setting

Related Topics

1. Jugular Venous Distention Workup

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