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Correct Answer - D
Ans. D: XII
Nucleus Ambiguus
Function:
* Motor innervation of ipsilateral muscles of the soft palate, pharynx,
larynx and upper esophagus.
Pathway:
* Axons of motor neurons in the nucleus ambiguus course with three
cranial nerves: C.N. IX (glossopharyngeal), C.N. X (vagus), C.N. XI
(the rostral or cranial portion of spinal accessory) to innervate
striated muscles of the soft palate, pharynx, larynx and upper
esophagus.
Deficits:
* Lesion of nucleus ambiguus results in atrophy (lower motor
neuron) and paralysis of innervated muscles, producing nasal
speech, dysphagia, dysphonia, and deviation of the uvula toward the
opposite side (strong side).
* No affection of the Sternocleidomastoid or Trapezius. These
muscles are innervated by cells in the rostral spinal cord (caudal
portion C.N. XI).

Correct Answer - D
Upper Quadrangular space
It has the following boundaries:
– the teres major inferiorly
– the long head of the triceps laterally
For the superior border, some sources list the teres minor, while
others list the subscapularis.
It contains the scapular circumflex vessels.