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.
Recent Post
Why my heel hurts when i walk : Possible Reasons and Fixes
Why my heel hurts when i walk : Possible Reasons and Fixes Heel pain can make everyday activities difficult. Many people notice discomfort while getting
8 best pain killers for muscle pain
8 best pain killers for muscle pain Pain is one of the most common health complaints worldwide, and pain killers are often the first solution
Immediate Gout Pain Relief Fast in 24 hours
Immediate Gout Pain Relief Fast in 24 hours Gout is a form of inflammatory arthritis caused by elevated serum uric acid levels, leading to the
5 Effective knee pain exercises at home
5 Effective knee pain exercises at home Knee pain exercises at home are a simple way to reduce pain, ease stiffness in an aching knee,
Why My Knee Hurt and Fix It?
Why My Knee Hurt and Fix It? Knee hurt is a common problem that can affect your daily routine, especially when walking, running, or climbing
Understanding ALL about Rheumatoid arthritis
Rheumatoid arthritis Rheumatoid arthritis (RA) is a disease of synovium (a thin, soft connective tissue membrane that lines the inner surface of synovial joints) characteristics