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Questions and Answers
Which muscle is the only upper limb muscle that is supplied by a cranial nerve?
Which muscle is the only upper limb muscle that is supplied by a cranial nerve?
- Rhomboid major
- Levator scapula
- Latissimus dorsi
- Trapezius (correct)
Which muscle is involved in the 'shrugging the shoulder' test?
Which muscle is involved in the 'shrugging the shoulder' test?
- Trapezius (correct)
- Levator scapula
- Rhomboid major
- Latissimus dorsi
Which muscle is responsible for the abduction of the arm above 90 degrees?
Which muscle is responsible for the abduction of the arm above 90 degrees?
- Levator scapula
- Rhomboid major
- Trapezius
- Serratus anterior (correct)
Which group of muscles passes from the scapula to the humerus?
Which group of muscles passes from the scapula to the humerus?
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Which region of the body has cutaneous innervation from C1 to C8?
Which region of the body has cutaneous innervation from C1 to C8?
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Study Notes
Muscle Innervation and Function
- The only upper limb muscle supplied by a cranial nerve is the trapezius muscle, which is innervated by the spinal accessory nerve (CN XI).
- The trapezius muscle is involved in the 'shrugging the shoulder' test, indicating its role in scapular elevation.
- The supraspinatus muscle is responsible for the abduction of the arm above 90 degrees.
- The rotator cuff muscles, which include the supraspinatus, infraspinatus, teres minor, and subscapularis, pass from the scapula to the humerus.
Cutaneous Innervation
- The region of the body with cutaneous innervation from C1 to C8 is the upper limb, specifically the arm and hand.
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