Jackofknives
Ipwnpoker.com
Topics: 91
Posts: 740
|
A tumor in the floor of the fourth ventricle has compressed the abducens nucleus in the dorsal part of the pons on the right. Your patient exhibits an internal strabismus. What else might you expect you to see in the patient?
(A) An ability to voluntarily look to the left with either eye
(B) An inability to wrinkle the forehead on the right
(C) A sensorineural hearing loss
(D) Alteration of taste on the anterior two-thirds of the tongue
(E) A right ptosis
___________________
There are many things in this world that can’t be changed no matter how hard you try. That’s why you must not hesitate when the time comes where you have to give it all you’ve got.
|
| forumdoctor
Forum Senior
Topics: 14
Posts: 123
|
A
|
| monam84
Forum Senior
Topics: 35
Posts: 135
|
A MLF conjugate gaze impaired not sure
|
| forumdoctor
Forum Senior
Topics: 14
Posts: 123
|
jack answer plsssssss
|
| Jackofknives
Ipwnpoker.com
Topics: 91
Posts: 740
|
Recall that facial nerve makes an internal genu around the adducens nucleus in the dorsal pons, meaning lesion of the CN6 nucleus will also very like to result in lesion of the CN7 nerve (NOTE: CN7 nerve, not CN nucleus!). This will result in Bell's palsi.
So the answer is B.
Now you might ask, why not D then, it seems right as well? Well taste buds in the anterior 2/3 of the tongue are indeed innervated by CN7, but they receive dual innervation. Yes, taste sensation could be altered, but B is the best answer.
___________________
There are many things in this world that can’t be changed no matter how hard you try. That’s why you must not hesitate when the time comes where you have to give it all you’ve got.
|
| forumdoctor
Forum Senior
Topics: 14
Posts: 123
|
thanks jack......
|
| new_n_lost
Forum Hero
Topics: 710
Posts: 6,299
|
Damn Never Thought of That !!!!!!!!
___________________
"never argue with a fool, they'll bring you down to their level and beat you with experience" FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
|
| monam84
Forum Senior
Topics: 35
Posts: 135
|
Whats the dual innervation to the ant 2/3 of tongue? Also, wouldnt the MLF be damaged if the lesion is at the floor of 4th ventricle?
|
| Jackofknives
Ipwnpoker.com
Topics: 91
Posts: 740
|
Yes, MLF can be damaged, but reread the options.
"An ability to voluntarily look to the left with either eye "
Lesion to the MLF results in medial rectus palsi, NOT the inability to look to the left with EITHER eye.
By dual innervations I meant, inevitably you may loose some innervation to the taste buds of the anterior 2/3 of the tongue, but not all.
___________________
There are many things in this world that can’t be changed no matter how hard you try. That’s why you must not hesitate when the time comes where you have to give it all you’ve got.
|
| monam84
Forum Senior
Topics: 35
Posts: 135
|
Thanks, great question and answer, keep it coming 
|
| mytime
Go Marching in!
Topics: 40
Posts: 3,169
|
Just the kinda NA qs. that have been coming on the test. Well done, JACKO!
|
|
| |
| | | | | | | | | | | |
