Anatomy Of The Pectoralis Minor Muscle

Courtesy: Prof Nabil Ebraheim, University of Toledo, Ohio, USA
ANATOMY OF PECTORALIS MINOR

Pectoralis minor is a thin triangular muscle in the upper part of chest situated beneath the pectoralis major muscle

It joins shoulder girdle to thorax

ORIGIN
From anterior surface of superior margins of 3 rd 4 th and 5 th ribs near the costal cartilage

INSERTION
Into the medial border of coracoid process of scapula

NERVE SUPPLY
Medial pectoral nerve(C8,T1)

ACTIONS
Stabilises the scapula
– Pulls anterior and inferior against the thoracic wall

Ligaments and muscles attached to coracoid process:

Ligaments

1.Coracoclavicular ligament
Conoid part-4.5 cm from acromio clavicular joint
Trapezoid part-3 cm from acromio clavicular joint
2.Coracoacromial ligament
3.Coracohumeral ligament

Muscles

1.Pectoralis Minor
2.Coracobrachialis
3.Short head of Biceps