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Questions and Answers
Which joint connects the shoulder girdle bones to the axial skeleton anteriorly?
Which joint connects the shoulder girdle bones to the axial skeleton anteriorly?
- Coracoclavicular joint
- Acromioclavicular joint
- Sternoclavicular joint (correct)
- Glenohumeral joint
Which muscle is responsible for depression of the shoulder and protraction of the scapula?
Which muscle is responsible for depression of the shoulder and protraction of the scapula?
- Serratus anterior
- Subclavius
- Trapezius
- Pectoralis minor (correct)
Which nerve innervates the subclavius muscle?
Which nerve innervates the subclavius muscle?
- Long thoracic nerve
- Nerve to subclavius (correct)
- Dorsal scapular nerve
- Medial pectoral nerve
What is the origin of the serratus anterior muscle?
What is the origin of the serratus anterior muscle?
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Which action is primarily associated with the serratus anterior muscle?
Which action is primarily associated with the serratus anterior muscle?
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Study Notes
Shoulder Anatomy
- The sternoclavicular joint connects the shoulder girdle bones to the axial skeleton anteriorly.
Muscle Functions
- The pectoralis minor muscle is responsible for depression of the shoulder and protraction of the scapula.
Muscle Innervation
- The subclavius muscle is innervated by the nerve C5-C6.
Muscle Origin
- The serratus anterior muscle originates from the surface of the scapula (1st to 9th ribs).
Muscle Actions
- The serratus anterior muscle is primarily associated with the action of rotation of the scapula.
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