Muscle of pectoral region
Table of Contents
The pectoral region has four muscles which are the Pectoralis major, Pectoralis minor, Subclavis, and Serratus anterior muscle . The origin, insertion, nerve supply, and their action are given below.ย
Pectoralis Major
Thin /Flat /Fan shaped Spiral and twisted muscle
Origin
- Clavicular Head
Medial 1/2 of anterior aspect of clavical
Lateral 1/2 of the anterior surface of the sternum (upto 6th costal cartilage )
ย ย 2. Sternal head
Aponuroses of external oblique muscle
Insertion
At the lateral lip of the Intertubercle sulcus
Nerve Supply
- Lateral pectoral nerve
- Medial pectoral nerve
Action
- Clavical head – Flexion of arm
- Sternocostal part – Adduction / Medial rotation of the arm.
Clinical Anatomy
If a sternocostal muscle fiber is missing there will be weakening in the Adduction and medial rotation of the arm.
Pectoralis Minor
Origin
From 3rd/4th/5th Rib near the costal cartilage
Insertion
It form thick tendon ( Medial Border of upper surface of coracoid process of scapula )
Nerve supply
- Medial and Lateral nerve
- Pectoral nerve
Action
- It Assest the serratus Anterior muscle in drawing the scapula forward
- Depression point of shoulder
- Accessory muscle of respiration
Subclavius
Origin
It arises from the 1st Rib costochondral Junction
Insertion
Insertion into a subclavian groove on the inferior surface of clavicle
Nerve Supply
Nerve to subclavius muscle
Action
Stabilize the clavicle during movement of the shoulder
Serratus anterior muscle
It is a broad sheath of muscle from boundary of the axilla
Origin
Upper 8/9 Ribs
Insertion
Insert into the costal surface of the scapula along the medial border.
Nerve supply
Long thoracic nerve / Bell’s Nerve ( c5,c6,c7)
Action
Pectoral minor and along with Serratus anterior muscle help in
- Pull to scapula forward around the chest wall. It is also called the Boxer muscle.
- Keep the Medial border scapula in opposition to the chest wall
- Lower fibers serratus anterior ( It rotates the scapula laterally upward )
- help in overhead Abduction of the arm.
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