FA2015 Cavernous sinus - 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 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-22-2015
USMLE Forums Newbie
 
Steps History: Not yet
Posts: 2
Threads: 1
Thanked 0 Times in 0 Posts
Reputation: 10
Default FA2015 Cavernous sinus

In FA2015 page 477, they kinda rephrase the sentence a little.

CN III, IV, V1, VI, and occasionally V2 plus
postganglionic sympathetic pupillary fibers

en route to orbit all pass through cavernous
sinus. Cavernous portion of internal carotid
artery is also here.

I'm a little confused about the sentence bolded above, does this mean that not all CN III, IV, VI, V(one), V(two) and post ganglionic symp. pupillary fibers passes through the cavernous sinus ? Some clarifications here would definitely help, thanks.
Reply With Quote Quick reply to this message



  #2  
Old 01-23-2015
CleverFOX's Avatar
USMLE Forums Veteran
 
Steps History: Step 1 Only
Posts: 239
Threads: 4
Thanked 176 Times in 116 Posts
Reputation: 188
Send a message via Skype™ to CleverFOX
Default

Quote:
Originally Posted by joscmh90 View Post
In FA2015 page 477, they kinda rephrase the sentence a little.

CN III, IV, V1, VI, and occasionally V2 plus
postganglionic sympathetic pupillary fibers

en route to orbit all pass through cavernous
sinus. Cavernous portion of internal carotid
artery is also here.

I'm a little confused about the sentence bolded above, does this mean that not all CN III, IV, VI, V(one), V(two) and post ganglionic symp. pupillary fibers passes through the cavernous sinus ? Some clarifications here would definitely help, thanks.
Yes it means all the 3 cranial nerve III,IV,VI pass through the Cavernous sinus along with V1 and V2....apart from this the Postganglionic sympathetic fibres also passes through the CS to reach the eye.


See the attachment...you will see,the cranial nerves as well as the postganglionic sympathetic fibres beside the internal carotid...
Attached Thumbnails
FA2015 Cavernous sinus-t9kc_m9e3yx85iv7m_nxz2yml62vs8t9aooqhng1rda.jpg  
Reply With Quote Quick reply to this message
  #3  
Old 01-23-2015
USMLE Forums Newbie
 
Steps History: Not yet
Posts: 2
Threads: 1
Thanked 0 Times in 0 Posts
Reputation: 10
Default

Quote:
Originally Posted by CleverFOX View Post
Yes it means all the 3 cranial nerve III,IV,VI pass through the Cavernous sinus along with V1 and V2....apart from this the Postganglionic sympathetic fibres also passes through the CS to reach the eye.


See the attachment...you will see,the cranial nerves as well as the postganglionic sympathetic fibres beside the internal carotid...
In FA2014.
The sentence is as follow;

CN III. IV, V(1), V(2) and VI and post ganglionic symp. fibers en route to the orbit all pass through the cavernous sinus. Cavernous portion of internal carotid artery is also here.

Maybe it's just me...but the changes in FA2015 gave me the understanding that only occasionally, we are able to see V2 and post ganglionic symp. fibers going through the cavernous sinus and it kinda contradicts what I've read and learn about which then leads to this confusion I'm having currently.
Reply With Quote Quick reply to this message
 
  #4  
Old 01-23-2015
CleverFOX's Avatar
USMLE Forums Veteran
 
Steps History: Step 1 Only
Posts: 239
Threads: 4
Thanked 176 Times in 116 Posts
Reputation: 188
Send a message via Skype™ to CleverFOX
Default

Quote:
Originally Posted by joscmh90 View Post
In FA2014.
The sentence is as follow;

CN III. IV, V(1), V(2) and VI and post ganglionic symp. fibers en route to the orbit all pass through the cavernous sinus. Cavernous portion of internal carotid artery is also here.

Maybe it's just me...but the changes in FA2015 gave me the understanding that only occasionally, we are able to see V2 and post ganglionic symp. fibers going through the cavernous sinus.
Nope that wont be correct... V2 ie the maxillary subdivison always passes through the CS...

I am now quoting GRAY's Anatomy for Students(2nd ED.) - Pg 844

Structures passing through the cavernous sinus are:
*The internal carotid artery
*The abducent nerve(VI)

Structures in the lateral wall are:
*The occulomotor nerve(III)
*The trochlear nerve(IV)
*The opthalmic nerve(V1)
*The maxillary nerve(V2)


and the internal carotid artery is accompanied by a plexus of symapthetic nerve...they are basically postganglionic fibres,the ganglia being the superior cervical ganglion...

This is my opinion I get your confusion, I think plus in that sentence meant "and"...now I am just I student,and shared what I know from my med school first year :P

Last edited by CleverFOX; 01-23-2015 at 01:28 AM.
Reply With Quote Quick reply to this message
The above post was thanked by:
joscmh90 (01-23-2015)



Reply

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
I need cavernous sinus video! eizou USMLE Step 1 Forum 2 08-01-2014 03:20 PM
Carotid and Aortic Body and Sinus! shwetha99 USMLE Step 1 Forum 4 01-19-2013 09:30 AM
Cavernous Sinsus Thrombosis Versus Orbital Cellulitis? tyagee USMLE Step 2 CK Forum 5 08-10-2012 08:47 PM
Urogenital Sinus Derivatives! ricko335 USMLE Step 1 Forum 4 08-16-2011 07:57 AM
cavernous sinus thrombosis achistikbenny USMLE Step 1 Forum 8 05-17-2010 12:58 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)