Questions and Answers
What are the origins of the Pectoralis Major?
What is the insertion of the Pectoralis Major?
Lateral lip of intertubercular groove of humerus
What is the action of the Pectoralis Major?
Flexion, medial rotation, horizontal adduction of upper extremity
What is the nerve supply for the Pectoralis Major?
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What is the origin of the Pectoralis Minor?
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What is the insertion of the Pectoralis Minor?
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What is the action of the Pectoralis Minor?
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What is the nerve supply for the Pectoralis Minor?
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What is the origin of the Subclavius?
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What is the insertion of the Subclavius?
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What is the action of the Subclavius?
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What is the nerve supply for the Subclavius?
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What is the origin of the Serratus Anterior?
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What is the insertion of the Serratus Anterior?
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What is the action of the Serratus Anterior?
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What is the nerve supply for the Serratus Anterior?
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Study Notes
Pectoral Muscles Overview
- Pectoralis Major originates from the clavicular head (medial clavicle) and sternal head (sternum, upper 6 costal cartilages).
- The insertion of Pectoralis Major is at the lateral lip of the intertubercular groove of the humerus.
- Primary actions of Pectoralis Major include flexion, medial rotation, and horizontal adduction of the upper extremity.
- Innervated by the lateral pectoral nerve (C5,6,7) and medial pectoral nerve (C8,T1).
Pectoralis Minor Details
- Pectoralis Minor originates from the 3rd to 5th ribs.
- Inserts at the coracoid process of the scapula.
- The muscle functions to draw the scapula inferiorly and anteriorly.
- Innervation is provided by the medial pectoral nerve (C8,T1).
Subclavius Muscle
- Originates from the 1st rib.
- Inserts at the middle third of the clavicle.
- Acts to depress the clavicle.
- Innervated by the nerve to subclavius (C5,6).
Serratus Anterior Function
- Originates from the lateral surface of ribs 1-8.
- Inserts at the medial border of the scapula.
- Holds the scapula against the thoracic wall and facilitates protraction and retraction of the scapula.
- Innervated by the long thoracic nerve (C5,6,7).
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Description
Explore the anatomy and functions of the pectoral muscles, including Pectoralis Major, Pectoralis Minor, Subclavius, and Serratus Anterior. Understand their origins, insertions, actions, and innervation to enhance your knowledge of upper body musculature.
