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Questions and Answers
What is the main function of the pectoralis minor muscle?
What is the main function of the pectoralis minor muscle?
- It assists in arm adduction.
- It stabilizes the shoulder girdle. (correct)
- It helps in shoulder elevation.
- It aids in respiratory movements.
Which of the following best describes the relationship between the subclavius muscle and the clavicle?
Which of the following best describes the relationship between the subclavius muscle and the clavicle?
- It connects the clavicle to the humerus.
- It is primarily responsible for clavicular rotation.
- It plays a role in stabilizing the clavicle. (correct)
- It serves as a primary mover for clavicular elevation.
Which structure is found beneath the pectoralis minor?
Which structure is found beneath the pectoralis minor?
- Coracoid process
- Brachial plexus
- Axillary artery (correct)
- Serratus anterior
What is a common consequence of pectoralis minor tightness?
What is a common consequence of pectoralis minor tightness?
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In which area of the body does the subclavius muscle primarily act?
In which area of the body does the subclavius muscle primarily act?
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Study Notes
Pectoralis Minor Muscle
- The pectoralis minor muscle acts to depress and protract the scapula.
- It also rotates the scapula downwards.
- It stabilizes the scapula against the rib cage.
Subclavius Muscle
- The subclavius muscle is located below the clavicle and attached to its underside.
- It works to depress the clavicle, stabilize the shoulder joint, and protect the brachial plexus and subclavian vessels.
Pectoralis Minor and Subclavius Muscles
- The pectoralis minor muscle lies beneath the subclavius muscle.
- The subclavius muscle is the most superficial muscle in the region, followed by the pectoralis minor.
Pectoralis Minor Tightness
- A common consequence of pectoralis minor tightness is rounded shoulders.
- This is due to the muscle pulling the scapula forward and downward.
- Tightness can also affect shoulder mobility, breathing, and posture.
Subclavius Muscle Location
- The subclavius muscle resides in the superior thoracic region.
- It is located between the clavicle and the first rib.
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