This document describes the anatomy of the axilla, including its boundaries, contents, and structures that pass through it. It details the walls that form the axilla, as well as the muscles, blood vessels, nerves, and lymph nodes contained within. The axillary artery and its branches in the axilla are also outlined.

1. by Yapa Wijeratne
Faculty of Medicine
University of Peradeniya
Sri Lanka

3. 3
1. Outer border of 1st rib
2. Clavicle -the posterior surface
3. Upper border of the scapula

4. 4
1. Pectoralis major
2. Pectoralis minor
3. Subclavius muscles
4. Clavipectoral fascia

5. 1
1. Upper part of serratus anterior
Lower limit of the axilla = level of 4th rib

6. 1
1. Intertubercular sulcus of the humerus

7. 3
1. Subscapularis (associated with the costal
surface of the scapula);
2. Latissimus dorsi- the distal part
3. Teres major

8.  Axillary fascia and a dome of skin that spans
the distance between the inferior margins of
the walls

9.  Pierced by 4 structures
 2 inwards
1. Lymphatics from the infraclavicular nodes to the apical
nodes of the axilla.
2. Cephalic vein

10.  2 outwards
1. Lateral pectoral nerve
2. Thoracoacromial artery,
or its branches
1. Pectoral
2. Acromial
3. Deltoid
4. Clavicular

12. 1. Axillary artery
2. Axillary vein
3. Brachial plexus
4. Lymphatics of the upper limb
5. Proximal parts of two muscles of the arm
1. Biceps brachii
2. Coracobrachialis
6. The axillary process of the breast
7. Collections of lymph nodes

13. Branches
1st part – 1
2nd part – 2
3rd part - 3

14. 1
 Send - Superior thoracic artery
2
 The - Thoraco-acromial artery
 Lord to - Lateral thoracic artery
3
 Say - Subscapular artery
 A - Anterior circumflex humeral artery
 Prayer - Posterior circumflex humeral artery

16. 1. An anterior or pectoral group
2. A posterior or subscapular group
3. A lateral group
4. A central group
5. An apical group

19. The inferior margin of
the Subscapularis
The surgical neck
of the Humerus
The lateral
margin of the
long head of the
Triceps brachii
The superior
margin of the
Teres major
Passing through the quadrangular space are
1. Axillary nerve
2. Posterior circumflex humeral artery and vein.

20.  the medial margin of the long head of the triceps brachii muscle;
 the superior margin of the teres major muscle;
 the inferior margin of the subscapularis muscle
 Passing through the triangular space are
1. circumflex scapular artery and vein

21. The shaft of the
humerus
The inferior
margin of the
teres major
muscle
The lateral
margin of the
long head of
the Triceps
brachii
Passing through the Triangular interval are
1. radial nerve