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Questions and Answers
Which muscle is responsible for flexion, adduction, and medial rotation of the arm?
Which nerve supplies the Pectoralis major muscle?
Where does the clavicular head of the Pectoralis major muscle originate from?
What is the insertion point of the Pectoralis major muscle?
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Which muscle extends the flexed arm?
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Which muscle raises the ribs in forced inspiration?
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Where does the Subclavis muscle insert?
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Which nerve supplies the Subclavis muscle?
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What is the origin of the Serratus anterior muscle?
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Where does the first digitations of the Serratus anterior muscle insert?
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Study Notes
Muscles and their Functions
- Pectoralis major muscle is responsible for flexion, adduction, and medial rotation of the arm.
- The muscle that extends the flexed arm is the deltoid, particularly the posterior fibers.
- Muscle responsible for raising the ribs during forced inspiration is the external intercostals.
Innervation and Blood Supply
- Pectoralis major muscle is supplied by the lateral and medial pectoral nerves.
- Subclavius muscle is supplied by the nerve to the subclavius.
- Both pectoralis major and subclavius receive blood through branches from the thoracoacromial trunk.
Muscle Origins and Insertions
- Clavicular head of the Pectoralis major originates from the medial half of the clavicle.
- The insertion point of the Pectoralis major is the lateral lip of the bicipital groove of the humerus.
- Serratus anterior muscle originates from the upper eight or nine ribs.
- The first digitations of the Serratus anterior muscle insert into the medial border of the scapula.
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Description
Test your knowledge on the origin, insertion, nerve supply, and action of the pectoralis major muscle in this quiz. Learn about the clavicular and sterno costal heads, as well as their specific anatomical details. Perfect for anatomy enthusiasts and students studying the upper body muscles.
