Review Note
Last Update: 02/12/2025 11:28 AM
Current Deck: Anatomy::RC::Back::Pol Compilation::Back muscle
PublishedCurrently Published Content
Front
After a radical neck surgery, the patient
experienced difficulty in shrugging his shoulder.
Which muscle is LIKELY involve?
A. Levator scapulae
B. Latissimus dorsi
C. Trapezius
D. Deltoid
experienced difficulty in shrugging his shoulder.
Which muscle is LIKELY involve?
A. Levator scapulae
B. Latissimus dorsi
C. Trapezius
D. Deltoid
Back
C. Trapezius
Explanation:
The trapezius muscle is primarily responsible for shrugging the shoulder. This muscle is innervated by the spinal accessory nerve (cranial nerve XI). Damage to this nerve, often a complication of radical neck surgery, can impair the trapezius muscle, leading to difficulty in shoulder shrugging and scapular elevation.
Key Details About the Trapezius Muscle:
- Function:
- Elevates the scapula (shrugging).
- Retracts and rotates the scapula.
- Depresses the scapula (lower fibers).
- Innervation:
- Motor: Spinal accessory nerve (cranial nerve XI).
- Proprioception: Cervical nerves (C3 and C4).
Why Not the Other Options?
- A. Levator Scapulae:
- Assists in elevating the scapula but plays a minor role compared to the trapezius.
- B. Latissimus Dorsi:
- Functions in adduction, extension, and medial rotation of the arm, not scapular elevation.
- D. Deltoid:
- Responsible for abduction of the arm, not scapular elevation or shoulder shrugging.
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