Which of the following is the most likely locus of this lesion? A 40 - ProProfs Discuss
Topics
Products
Follow Us:

Which of the following is the most likely locus of this lesion? A 40-year-old male who had been suffering from a disorder of unknown origin complains to his physician that he has difficulty in producing a smile from the left side of his face and that he can't salivate or produce tears from the left eye. Further analysis showed some loss of taste and that the affected muscles were flaccid and the eyelids were open.



A. The nucleus of the facial nerve
B. Inferior and superior ganglia of cranial nerve IX
C. Geniculate ganglion
D. Cerebral cortex
E. Reticular formation
Asked by Lane, Last updated: Dec 18, 2019

This question is part of

USMLE step 1 Qs (8)

+ Answer
Request

2 Answers

E. Good

E. Good

Answered Jan 17, 2019

The answer to this is letter C. What is the geniculate ganglion? This has gotten its name because it somehow looks like a knee that is bent. This is composed of a variety of nerves that are responsible for the responses that the face makes. The fact that the person is unable to make certain expressions may signify that the geniculate ganglion is affected by it. The other choices available may provide other symptoms if they are affected but at this point, it is letter C that would need...Read More
 

John Smith

John Smith

Answered Sep 08, 2016

Geniculate ganglion -the nerve affected by this disorder is cranial nerve vii (facial nerve). the cell bodies of origin, which innervate the muscles of facial expression (special visceral efferents), arise from the facial nucleus, which are located in the ventrolateral aspect of the lower pons. the preganglionic parasympathetic neurons, which synapse with postganglionic neurons in the submandibular and pterygopalatine ganglia, arise from the superior salivatory nucleus of the lower pons. the...Read More
 

Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer
Search for Google images
Select a recommended image
Upload from your computer

Email Sent
We have sent an email to your address "" with instructions to reset your password.