Neuroanatomy Tract Lesion Collection - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum > USMLE Step 1 High Yield > USMLE Step 1 Bits & Pieces

USMLE Step 1 Bits & Pieces High yield short focused points, monographs, charts, illustrations, tables, and other stuff related to the USMLE Step 1 Exam.


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 02-11-2013
USMLE Forums Scout
 
Steps History: ---
Posts: 75
Threads: 12
Thanked 61 Times in 32 Posts
Reputation: 71
Neuro Neuroanatomy Tract Lesion Collection

I've seen these questions on NBMEs and someone told me to expect at least one or two of these on the exam.

I have compiled a less of the fiber tracts, their actions/damage results, and the damage is seen either the ipsilateral or contralateral sides.

Please take a look at it and see if I have the right informations (especially the contralateral & ipsilateral).

Thank you.


Dorsal Column
o Action/damage results: ascending pressure, vibration, touch & proprioceptive sensation
o Ipsilateral: nucleus cuneatus or gracilis (medulla)
o Contralateral: decussates in medulla & ascends contralaterally in medial lemniscus

Lateral corticospinal tract
o Action/damage results: voluntary movement of contralateral limbs; spastic paraysis of lower limbs & flaccid paralysis of upper limp
• if lesions of the corticospinal tract occur above the pyramidal decussation ( caudal medulla):
o weakness is seen in muscles on the contralateral side of the body
• if lesions of the corticospinal tract occur below the pyramidal decussation (caudal medulla):
o weakness is seen in muscles on the ipsilateral side of the body

Spinothalamic tract
o Action/damage results: loss of pain & temperature
o See damage on ipsilateral side (if the damage is in the spinal cord)
o See damage on the contralateral side (if the fibers already decussates at anterior white commissure & ascends contralaterally)

Lower motor neurons in the ventral/medial horn
o Action/damage results: flaccid paralysis of axial muscles
o See damage on the ipsilateral side

Lateral horn
o Action/damage results: flaccid paralysis of limb muscles
o See damage on the ipsilateral side

Spinocerebellar
o Action/damage results: loss of unconscious proprioceptive (limb and joint position)
o See damage on the ipsilateral side
Reply With Quote Quick reply to this message
The above post was thanked by:
dr Blue (08-03-2014), drzi (01-04-2014), HIM@KASHYAP (02-13-2013), jpalargue (02-18-2013), laarnijoy (02-12-2013), md-88 (03-12-2014), R777 (12-26-2013), Rsadhu (05-21-2015), slime66 (02-15-2013), sp1990 (07-07-2014), sreyasi bhattach (06-21-2013), Thrax_usmle (02-12-2013)



  #2  
Old 02-11-2013
USMLE Forums Guru
 
Steps History: 1+CK+CS+3
Posts: 304
Threads: 48
Thanked 291 Times in 106 Posts
Reputation: 301
Default

This list u made is perfect except one thing.... spinothalamic tract damage is always contralateral regardless of the site of damage.
Reply With Quote Quick reply to this message
The above post was thanked by:
dr_pawandeep (07-01-2014), luschka (02-11-2013), Thrax_usmle (02-12-2013)
  #3  
Old 02-12-2013
Master shifu's Avatar
USMLE Forums Addict
 
Steps History: Step 1 Only
Posts: 191
Threads: 14
Thanked 87 Times in 59 Posts
Reputation: 97
Default

Quote:
Originally Posted by obinocle View Post
This list u made is perfect except one thing.... spinothalamic tract damage is always contralateral regardless of the site of damage.

Yeah......it's true but when the lesion involves a specific segment then contralateral loss of pain & temperature will occur below the level of involvement but what will happen those fibres that enters spinal cord through that specific segment involved..................

I think loss of pain & temperature will be contralateral below the segment that is involved..................and will be ipsilateral at that area supplied by the segment affected.
Reply With Quote Quick reply to this message
 
  #4  
Old 02-12-2013
USMLE Forums Scout
 
Steps History: ---
Posts: 75
Threads: 12
Thanked 61 Times in 32 Posts
Reputation: 71
Default

Spinothalamic tract injury updated:

- The analgesia begins contralateral w/ 1 to 2 segments below the lesion & includes everything below that level.
- i.e. Cut @ right T5, loose stuff on left T7
Reply With Quote Quick reply to this message
  #5  
Old 07-01-2014
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 64
Threads: 8
Thanked 14 Times in 12 Posts
Reputation: 24
Default

Quote:
Originally Posted by Master shifu View Post
Yeah......it's true but when the lesion involves a specific segment then contralateral loss of pain & temperature will occur below the level of involvement but what will happen those fibres that enters spinal cord through that specific segment involved..................

I think loss of pain & temperature will be contralateral below the segment that is involved..................and will be ipsilateral at that area supplied by the segment affected.
loss of all the sensations and flaccid paralysis at the level of lesion
Reply With Quote Quick reply to this message



Reply

Tags
Neuroanatomy-

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Collection of CS videos ApplicantGuide USMLE Links & Free Ads 0 03-10-2012 03:38 PM
Gold Collection for Step 1 lsumed64 USMLE Step 1 Forum 2 03-01-2012 06:26 PM
Amilotropic Lateral Sclerosis: Mixed Lesion or Pure Motor Lesion? patelMD USMLE Step 1 Forum 5 08-16-2011 12:29 PM
lesion of the corticospinal tract sohni USMLE Step 1 Forum 9 03-31-2011 12:24 AM
neurophys question on tract lesion Clawhand USMLE Step 1 Forum 4 10-07-2010 08:17 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)