Human Anatomy Vol 1

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to the lower border of the teres major muscle where it
continues as the brachial artery. Its direction varies with
the position of the arm.
The pectoralis minor muscle crosses the artery and
divides it into three parts (Fig. a.6).
i. First part, superior (proximal) to the muscle.
ii. Second part, posterior (deep) to the muscle.
iii. Third part, inferior (distal) to the muscle.

Relolions of Firsl Pod
Anferupr
1 Skin
2 Superficial fascia, platysma and supraclavicular
nerves
3 Deep fascia


(^4) Clavicular part of the pectoralis major (Fig. a.7a)
Coracoid process
Axillary artery
Subclavian artery
Pectoralis minor
Brachial artery
Teres major
Fig. 4.6: The extent and parts of the axillary aftery
Supraclavicular nerves
Thoracoacromial artery
Lateral pectoral nerve
Axillary artery
AXILLA
5 Clavipectoral fascia with cephalic vein, lateral
pectoral nerve, and thoracoacromial artery.
6 Loop of communication between the lateral and
medial pectoral nerves.
Fosferior
1 First intercostal space with the external intercostal
muscle
2 First and second digitations of the serratus anterior
with the nerve to serratus anterior.
3 Medial cord of brachial plexus with its medial
pectoral branch.
Ieferryf
Lateral and posterior cords of the brachial plexus
tutredfof
Axillary uein: The first part of the axillary artery is
enclosed (together with the brachial plexus) in the
axillary sheath, derived from the prevertebral layer of
deep cervical fascia.
Relolions of Second Porl
"4nfenor
1 Skin
2 Superficial fascia
3 Deep fascia
4 Pectoralis major
5 Pectoralis minor (Fig. a.7b)
Fosferior
L Posterior cord ofbrachial plexus
2 Subscapularis
Isfersf
L Lateral cord ofbrachial plexus
(^2) Coracobrachialis (Fig. a.8)
Platysma
Deep fascia
Pectoralis major
Clavipectoral fascia
Cephalic vein
Axillary vein
Medial pectoral nerve
Al
Humerus
Posterior cord
Nerve to serratus anterior
Serratus anterior
Lateral cord
tt
E
=o
EL.cL


Co
()
o
a
Firsi intercostal space
Fig.4.7a: Relations of first part of axillary adery

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