Pectoralis minor muscle () is a thin, triangular muscle, situated at the upper part of the chest, beneath the pectoralis major in the human body. It arises from ribs III-V; it inserts onto the coracoid process of the scapula. It is innervated by the medial pectoral nerve. Its function is to stabilise the scapula by holding it fast in position against the Thoracic wall.
Structure
Attachments
From the muscle's origin, the muscle's fibers pass superiorly and laterally, converging to form a flat tendon.
Origin
Pectoralis minor muscle arises from the upper margins and outer surfaces of the 3rd, 4th, and 5th
near their costal cartilages, and from the
Aponeurosis covering the intercostalis.
Insertion
Its tendon inserts onto the medial border and upper surface of the
coracoid process of the
scapula.
Innervation
The muscle receives motor innervation from the medial pectoral nerve.
Relations
Pectoralis minor muscle forms part of the anterior wall of the
axilla.
It is covered anteriorly (superficially) by the clavipectoral fascia. The medial pectoral nerve pierces the pectoralis minor and the clavipectoral fascia. In attaching to the coracoid process, the pectoralis minor forms a 'bridge' - structures passing into the upper limb from the thorax will pass directly underneath.
[http://www.teachmeanatomy.com/muscles-of-the-pectoral-region/ ]
Axillary nodes are classified according to their positions relative to the pectoralis minor muscle. Level 1 are lateral, Level 2 are deep, Level 3 are medial. The pectoralis minor divides the axillary artery into three parts
Variations
The origin is from the second, third and fourth or fifth ribs. The tendon of insertion may extend over the coracoid process to the greater tubercle. It may be split into several parts. Absence of this muscle is rare but happens with certain uncommon diseases, such as the
Poland syndrome.
Function
Pectoralis minor muscle depresses the point of the
shoulder, drawing the
scapula superior, towards the
thorax, and throwing its
inferior angle posteriorly.
See also
-
Pectoralis minor syndrome
External links
