Pectoralis minor muscle
Pectoralis Minor Muscle
The Pectoralis Minor Muscle (Pronunciation: pek-to-ral-is min-or mus-cle) is a thin, triangular muscle located in the upper chest, beneath the Pectoralis Major.
Etymology
The term "Pectoralis" is derived from the Latin word "pectus" which means chest, and "minor" refers to the smaller size of this muscle compared to the Pectoralis Major.
Anatomy
The Pectoralis Minor originates from the third, fourth, and fifth ribs near their cartilage and inserts into the coracoid process of the scapula. It is innervated by the medial pectoral nerve.
Function
The primary function of the Pectoralis Minor is to stabilize the scapula by drawing it inferiorly and anteriorly against the thoracic wall. This muscle also aids in respiration, as it lifts the ribs when the scapula is stationary, aiding in deep inhalation.
Related Terms
- Pectoralis Major: The larger, superficial muscle situated in the chest area.
- Coracoid Process: A small hook-like structure on the lateral edge of the superior anterior portion of the scapula.
- Scapula: Also known as the shoulder blade, it connects the humerus bone of the arm to the collarbone.
- Medial Pectoral Nerve: A nerve that arises from the medial cord of the brachial plexus and through it, innervates the Pectoralis Minor and Pectoralis Major muscles.
External links
- Medical encyclopedia article on Pectoralis minor muscle
- Wikipedia's article - Pectoralis minor muscle
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