Human Anatomy Vol 1

Superior border of scapula

AXILLA

Apex of axilla

(cervicoaxillary

canal)

Lateral wall

Medial wall

of clavicle

Anterior wall (opened)

Lateral wall

Figs 4.2a to c: (a) Boundaries of the apex of the axilla, (b) walls of the axilla, and (c) opened up axilla

Eo-

6l

& I Posterlor wall

EI

b o-tI Anterior wall

fL

U)

Base of axilla

Bose ol Flool

It is directed downwards, and is formed by skin,
superficial and axillary fasciae. It is convex upwards in
congruence with concavity of axilla.

Anlerior ll

It is formed by the following.
i. The pectoralis major in front (Fig.4.3).
ii. The clavipectoral fascia
iii. Pectoralis minor.

Posterior II

It is formed by the following.

i. Subscapularis above (Fi9.4.4),

ii. Teres major and

iii. Latissimus dorsi below

Mediol II

It is convex laterally and formed by the following.

i. Upper four ribs with their intercostal muscles.

ii. Upper part of the serratus anterior muscle (Fig. 4.5).

lolerol ll

It is very narrow because the anterior and posterior

walls converge on it. It is formed by the following.

Fig. 4.3: Anterior and posterior walls of the axilla with the axillary

artery

i. Upper part of the shaft of the humerus in the region

of the bicipital groove, and

ii. Coracobrachialis and short head of the biceps

brachii (Fig.4.5).

CONTENTS OF AXITLA

1 Axillary artery and its branches (Fig.4.5).

2 Axillary vein and its tributaries.

3 Infraclavicular part of the brachial plexus.

Subclavius

Pectoralis

maJor

Clavipectoral

fascia

Pectoralis

mtnor

Suspensory

ligament

Sub-

scapularis

Axillary

artery

Teres

malor

Latissimus

dorsi

.o

e

o

CL

CL

E

o

c)o

a

Axillary fascia

(base of axilla)