Podcast
Questions and Answers
Which muscle is located under the pectoralis major and forms the anterior wall of the axilla?
Which muscle is located under the pectoralis major and forms the anterior wall of the axilla?
From which of the following does the clavicular head of the pectoralis major originate?
From which of the following does the clavicular head of the pectoralis major originate?
What is the nerve supply for the pectoralis major muscle?
What is the nerve supply for the pectoralis major muscle?
Which muscle in the pectoral region helps in flexion of the upper limb?
Which muscle in the pectoral region helps in flexion of the upper limb?
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What does the pectoralis major muscle do?
What does the pectoralis major muscle do?
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Which muscle is responsible for drawing the ribs upward and outwards during deep inspiration?
Which muscle is responsible for drawing the ribs upward and outwards during deep inspiration?
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Which muscle depresses or fixes the clavicle during movement of the shoulder joint?
Which muscle depresses or fixes the clavicle during movement of the shoulder joint?
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What is the function of the pectoralis minor muscle?
What is the function of the pectoralis minor muscle?
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What is a significant clinical sign of damage to the long thoracic nerve, which innervates the serratus anterior muscle?
What is a significant clinical sign of damage to the long thoracic nerve, which innervates the serratus anterior muscle?
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What structures lie deep to the pectoralis minor muscle and its tendon?
What structures lie deep to the pectoralis minor muscle and its tendon?
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Study Notes
Pectoralis Muscles
- The pectoralis minor muscle is located under the pectoralis major and forms the anterior wall of the axilla.
- The clavicular head of the pectoralis major originates from the clavicle.
- The pectoralis major muscle is supplied by the medial and lateral pectoral nerves.
- The pectoralis major muscle helps in flexion of the upper limb.
- The pectoralis major muscle adducts, flexes, and rotates the humerus medially.
- The pectoralis minor muscle helps in drawing the ribs upward and outwards during deep inspiration.
- The pectoralis minor muscle also depresses or fixes the clavicle during movement of the shoulder joint.
- The function of the pectoralis minor muscle is to assist in inspiration and stabilize the scapula.
- A significant clinical sign of damage to the long thoracic nerve, which innervates the serratus anterior muscle, is a winged scapula.
- The structures that lie deep to the pectoralis minor muscle and its tendon are the ribs, intercostal muscles, and axillary vessels.
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Description
Explore the anatomy of the pectoral region and axilla, including the bones, muscles, and their functions. Learn about the clavicle, scapular, humerus, pectoralis major, pectoralis minor, subclavius, and serratus anterior.
