Question
Identify the nerve marked as ‘B’ in the given image
| A. |
Thoracodorsal nerve
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| B. |
Long thoracic nerve
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| C. |
Lower subscapular nerve
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| D. |
Intercostobrachial nerve
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Show Answer
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Correct Answer � A
Explanation
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Answer A) Thoracodorsal nerve
The thoracodorsal nerve is a pure motor nerve that innervates the latissimus dorsi muscle
- The latissimus dorsi muscle is a large, fan-shaped muscle that originates from the spinous processes of T7 to L5, the thoracolumbar fascia, and iliac crest.
- It inserts in the intertubercular groove of the humerus bone and acts to extend, internally rotate, and adduct the arm.
- The primary blood supply of the latissimus dorsi muscle is the thoracodorsal artery.
- The dorsal divisions of T6 to T12 provide the sensory innervation of the skin of the latissimus dorsi muscle
