Pectoralis minor muscle

Pectoralis minor muscle

Muscle infobox
Name = Pectoralis minor
Latin = musculus pectoralis minor
GraySubject = 122
GrayPage = 438


Caption =


Caption2 = |
Origin = 3rd to 5th ribs, near their costal cartilages
Insertion = medial border and superior surface of the coracoid process of the scapula
Blood = Pectoral branch of the thoracoacromial trunk
Nerve = Medial pectoral nerve (C8, T1) Lateral pectoral nerve
Action = It stabilizes the scapula by drawing it inferiorly and anteriorly against the thoracic wall.
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12550138
The Pectoralis minor is a thin, triangular muscle, situated at the upper part of the chest, beneath the Pectoralis major.

Origin and insertion

It arises from the upper margins and outer surfaces of the third, fourth, and fifth ribs, near their cartilages 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.

Relations

The pectoralis minor muscle is covered anteriorly (superficially) by the clavipectoral fascia. The medial pectoral nerve pierces the pectoralis minor and the clavipectoral fascia.

Actions

The Pectoralis minor depresses the point of the shoulder, drawing the scapula downward and medialward toward the thorax, and throwing the inferior angle backward.

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.


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External links

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* [http://faculty.ucc.edu/biology-potter/Musculature/sld014.htm Slide]
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  • musculus pectoralis minor — [TA] smaller pectoral muscle: origin, third, fourth, and fifth ribs; insertion, coracoid process of scapula; innervation, lateral and medial pectoral; action, draws shoulder forward and downward, raises third, fourth, and fifth ribs in forced… …   Medical dictionary

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