Hiérarchie anatomique

Anatomie générale > Muscles; Système musculaire > Muscles du thorax > Muscle petit pectoral



Origin: 3rd to 5th ribs, near their costal cartilages

Insertion: Medial border and superior surface of the coracoid process of the scapula

Artery: Pectoral branch of the thoracoacromial trunk

Nerve: Medial pectoral nerves (C8, T1)

Action: Stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall

The Pectoralis minor is a thin, triangular muscle, situated at the upper part of the thorax, beneath the Pectoralis major. It arises from the upper margins and outer surfaces of the third, fourth, and fifth ribs, near their cartilage and from the aponeuroses covering the Intercostalis; the fibers pass upward and lateralward and converge to form a flat tendon, which is inserted into the medial border and upper surface of the coracoid process of the scapula.
Variations.—Origin from second, third and fourth or fifth ribs. The tendon of insertion may extend over the coracoid process to the greater tubercle. May be split into several parts. Absence rare. Pectoralis minimus, first rib-cartilage to coracoid process. Rare

Cette définition contient du texte provenant d'une édition publique de Gray's Anatomy (20eme édition Américaine de "Gray's Anatomy of the Human Body" publiée en 1918 - http://www.bartleby.com/107/).


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