Podcast
Questions and Answers
Which muscle is responsible for stabilization of the clavicle?
Which muscle is responsible for stabilization of the clavicle?
What action is primarily performed by the Pectoralis Major?
What action is primarily performed by the Pectoralis Major?
Which nerve supplies the Pectoralis Minor?
Which nerve supplies the Pectoralis Minor?
Which muscle's action includes protraction of the scapula?
Which muscle's action includes protraction of the scapula?
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From which ribs does the Serratus Anterior originate?
From which ribs does the Serratus Anterior originate?
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Study Notes
Pectoral Region Muscles
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Pectoralis Major:
- Origin (Clavicular Head): Anterior surface of medial part of clavicle
- Origin (Sternocostal Head): Sternum, upper 6 costal ribs
- Insertion: Lateral lip of the bicipital groove of humerus
- Nerve Supply: Medial and lateral pectoral nerves
- Action: Adduction of the arm, medial rotation of arm, climbing, forced inspiration, flexion of the shoulder
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Pectoralis Minor:
- Origin: 3rd, 4th, 5th ribs
- Insertion: Coracoid process of scapula
- Nerve Supply: Medial pectoral nerve
- Action: Draws the scapula anteroinferiorly, depression of the shoulder, forced inspiration
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Subclavius:
- Origin: Junction between 1st rib and its cartilage
- Insertion: Subclavian groove of clavicle
- Nerve Supply: Nerve to subclavius
- Action: Stabilizes the clavicle
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Serratus Anterior:
- Origin: Originates from fleshy digitations from the outer surface of first 8 ribs
- Insertion: Ventral surface of medial border of scapula
- Nerve Supply: Nerve to serratus (Long thoracic)
- Action: Protraction of scapula, used in boxing & pushing, abduction of arm >90, used in punishment
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Description
Test your knowledge of the muscles in the pectoral region, including the pectoralis major, pectoralis minor, subclavius, and serratus anterior. Learn about their origins, insertions, nerve supplies, and actions in this informative quiz.
