Medial group of muscles of Shoulder region

Medial group of muscles of Shoulder region –

Table of Contents

This is a flat, long muscle extends obliquely downwards and forwards between the dorsal angle of the scapula and the arm. It lies behind the subscpularis and on the medial face of the long and medial heads of the triceps
Origin: The dorsal angle of the scapula and the adjacent part of the posterior border of the scapula
Insertion: By a short flat tendon in common with the latissimus dorsi to the medial tubercle of the humerus
Action: To flex the shoulder and adduct the arm
Blood supply: Subscapular artery
Nerve supply: Nerve to teres major

This muscle occupies the subscapsular fossa and presents three fleshy parts
Origin: Subscapular fossa
Insertion: By a flat tendon to the posterior division of the medial tuberosity of the humerus. It is covered by the tendon of origin of coracobrachialis
Action: To adduct the arm
Blood supply: Subscapular artery
Nerve supply: Nerves to Subscapularis

The muscle lies partly on the medial face of the shoulder joint and the arm
Origin: Coracoid process of scapula
Insertion:
- To a small area on the upper part of the medial surface of the humerus above the teres tubercle
- To the middle third of the anterior surface of the humerus
Action: To adduct the arm and flex the shoulder joint
Blood supply: Anterior circumflex artery
Nerve supply: Musculo-cutaneous nerve

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