MUSCLE OF PECTORAL REGION 

=> Pectoral is upper chest region. There are three muscle in Pectoral Region.

1) Pectoral major
2) Pectoral minor
3) Subclavian

Superficial Muscle of Anterior Chest and Arm (left side)

Deep Muscle of Anterior Chest and Arm (left side)

PECTORALIS MAJOR :-

ORIGIN :-
sternal half of the clavicle, Upper half of sternum, aponeurosis of external oblique muscle

INSERTION :- lateral lip of intertubercular sulcus

ACTIONS :- adduction, medial rotation and flexion of the shoulder

NERVE SUPPLY :- Medial & Lateral Pectoral Nerve.

PECTORAL MINOR :- 

ORIGIN:- costocondral junction of 3rd, 4th ,5th ribs

INSERTION: corocoid process medial &upper surface

ACTIONS: draws the scapula forwards, depression of the shoulder.

NERVE SUPPLY :- Medial & Lateral
Pectoral Nerve (C5-8,T1)

SUBCLAVIUS

ORIGIN: 1st rib at the costochondral junction.

INSERTION: subclavian groove of the clavicle

ACTION: steadies the clavicle

NERVE SUPPLY: Nerve to Subclavius from
upper trunk of Brachial plexus
(C5,C6)