Pectoralis Major Muscle - Attachment, Action & Innervation
Pectoralis Minor Muscle – Attachment, Action & Innervation
The pectoralis minor muscle is a small, triangular muscle located beneath the pectoralis major.
Attachments of Pectoralis Minor Muscle: Origin & Insertion
Origin: (proximal attachments):
Anterior surfaces of the sternal ends of ribs 3-5.
Insertion: (distal attachments):
Coracoid process of scapula.
Actions on the shoulder (scapula):
Draws scapula forward and downward. (It also elevates ribs if origin & insertion are reversed).
Learn the muscles of the body with ease thanks to these muscle anatomy reference charts.
Nerve to Muscle and its Spinal Segment:
Medial pectoral nerve (C8, T1).
Muscles That Act On The Anterior Shoulder