The small pectoral muscle is located deeply with respect to the pectoralis major muscle. It originates with three tendon digitations from the external face and from the posterior margin of the 3rd, 4th and 5th coast. The muscular bundles are directed upwards and converge at the apex and medial margin of the coracoid process of the scapula.
By contracting, it lowers the shoulder, rotates it internally and abducts it; lift the ribs (inspiratory muscle).
It is innervated by the anterior thoracic nerves of the brachial plexus (C6-C7)
ORIGIN With 3 tendon digits from the outer face and from the upper edge of the 3rd, 4th and 5th ribs (near the costal cartilage) |  |
INSERTION Apex and medial margin of the coracoid process of the scapula | |
ACTION Lower the shoulder, rotate it internally and abduct it; elevates ribs (inspiratory muscle) | |
| INNERVATION Anterior thoracic nerves of the brachial plexus (C6-C7). |
| Upper limb | Lower limb | Trunk | Abdomen | Articles |
