Sponsored Links
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
Like Tree2Likes

Thread: Neuroanatomy Q1*

  1. #1
    Roxanita is offline Senior Member
    Join Date
    May 2004
    Posts
    539
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts

    Neuroanatomy Q1*

    Advertisements



    A 48-year-old man comes to his physician because his wife noticed that his right pupil is "small." Physical examination shows that the right pupil is constricted and does not react to light. His left pupil is normal. These findings are most likely due to a lesion involving which of the following structures on the right?

    A) Cervical spinal cord

    B) Frontal eye fields

    C) Lateral geniculate nucleus

    D) Optic tract

    E) Visual cortex

  2. #2
    mmw
    mmw is offline Newbie
    Join Date
    Dec 2004
    Posts
    13
    Downloads
    9
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    may be the answer is A?

  3. #3
    Asclepius1's Avatar
    Asclepius1 is offline Ultimate Member 537 points
    Join Date
    Feb 2006
    Posts
    5,087
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    I think the correct answer is D.

  4. #4
    Roxanita is offline Senior Member
    Join Date
    May 2004
    Posts
    539
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts

    a)

    From the question:

    A 48-year-old man comes to his physician because his wife noticed that his right pupil is "small." Physical examination shows that the right pupil is constricted and does not react to light. His left pupil is normal. These findings are most likely due to a lesion involving which of the following structures on the right?
    A) Cervical spinal cord
    B) Frontal eye fields
    C) Lateral geniculate nucleus
    D) Optic tract
    E) Visual cortex
    If we analyze quickly the answers...

    Option B) Frontal Eye Field; is located in the posterior part of the middle frontal gyrus (Brodmann's area 8. It regulates voluntary contralateral horizontal gaze. A lesion here would give us Ipsilateral conjugate deviation of the eyes. (away from the lesion)

    The left options C) Lateral Geniculate Nucleus; D) Optic tract and E) Visual cortex (Brodmann's area 17); would give us a contralateral component or other clinical features not present on this patient.



    Therefore having only myosis on this pt we could think about another known condition called Horner's Syndrome which in this case could explain the clinic signs of the patient and give us so for the answer A) as we know Horner syndrome is due to paralysis of the cervical sympathetic nerves.

    The symptoms of Horner's syndrome include:

    * Drooping of the upper eyelid
    * Swelling of the lower eyelid
    * Sinking of the eyeball
    * An absence of sweat on the same side of the face as the affected eye
    * The pupil becomes smaller (miotic)
    * Each iris may be a different color



    bbsskr and chintan patel like this.

  5. #5
    sarda is offline Member 510 points
    Join Date
    Dec 2006
    Posts
    116
    Downloads
    94
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Thanks Good Explanation

  6. #6
    tehmina is offline Junior Member 510 points
    Join Date
    Apr 2009
    Posts
    43
    Downloads
    27
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    ans is aaaaaaaaaaaaa

  7. #7
    roadhouse is offline Junior Member 510 points
    Join Date
    Aug 2010
    Posts
    20
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    ansa is aaaaaaaaaaaa

  8. #8
    anatomydude is offline Junior Member 510 points
    Join Date
    Jul 2011
    Posts
    23
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    definitely a horner's. A

  9. #9
    businessdegree is offline Newbie 510 points
    Join Date
    Jul 2012
    Posts
    10
    Downloads
    0
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    The answer is A!!

  10. #10
    bbsskr is offline Newbie 510 points
    Join Date
    Dec 2008
    Posts
    3
    Downloads
    9
    Uploads
    0
    Thanks
    0
    Thanked 0 Times in 0 Posts
    The answer is A. and the explanation is quite good....

Page 1 of 2 12 LastLast

Similar Threads

  1. Need brs neuroanatomy
    By MD7 in forum Free Downloads
    Replies: 4
    Last Post: 05-25-2011, 03:32 PM
  2. BRS Neuroanatomy
    By mr_bungle in forum St. Georges University School of Medicine
    Replies: 16
    Last Post: 06-06-2008, 04:23 PM
  3. neuroanatomy BRS
    By Rgupta716 in forum USMLE Step 1 Forum
    Replies: 0
    Last Post: 01-22-2008, 12:52 AM
  4. neuroanatomy
    By md90 in forum USMLE Step 1 Forum
    Replies: 0
    Last Post: 06-06-2006, 09:15 PM
  5. Brs Neuroanatomy
    By JATTSOUNDZ in forum St. Matthews Medical School Classifieds
    Replies: 0
    Last Post: 05-14-2006, 06:00 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •