J-Reflex and Kent nerve? - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
USMLE Articles
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

Thread Tools Search this Thread Display Modes
Old 09-13-2010
USMLE Forums Veteran
Steps History: 1 + CS
Posts: 217
Threads: 56
Thanked 116 Times in 56 Posts
Reputation: 116
Lungs J-Reflex and Kent nerve?

Ok guys I know this is going to sound stupid, but I don't have my physio book with me at the library, is J-reflex the same as Herring bauer inflation reflex?

I do know however for a fact that J receptors are sensory nerve endings in alv wall in juxtaposition to pulm capillaries. They are stimulated when irritant chemicals are injected into pulm bld or when pulm capillaries become engorged with bld or in pulm edema(as in CHF)

thanks again ppl!
Reply With Quote Quick reply to this message
The above post was thanked by:
ashishkabir (09-13-2010)

Old 09-13-2010
YoramFishke's Avatar
USMLE Forums Veteran
Steps History: 1+CK+CS
Posts: 248
Threads: 11
Thanked 303 Times in 127 Posts
Reputation: 333

Yes they are the same

Receptors in the airways and lungs are innervated by myelinated and unmyelinated vagal fibers. The unmyelinated fibers are C fibers. The receptors innervated by myelinated fibers are commonly divided into slowly adapting receptors and rapidly adapting receptors on the basis of whether sustained stimulation leads to prolonged or transient discharge in their afferent nerve fibers. The other group of receptors presumably consists of the endings of C fibers, and they are divided into pulmonary and bronchial subgroups on the basis of their location.

The shortening of inspiration produced by vagal afferent activity (Figure 36-3) is mediated by slowly adapting receptors. So are the Hering-Breuer reflexes. The Hering-Breuer inflation reflex is an increase in the duration of expiration produced by steady lung inflation, and the Hering-Breuer deflation reflex is a decrease in the duration of expiration produced by marked deflation of the lung. Because the rapidly adapting receptors are stimulated by chemicals such as histamine, they have been called irritant receptors. Activation of rapidly adapting receptors in the trachea causes coughing, bronchoconstriction, and mucus secretion, and activation of rapidly adapting receptors in the lung may produce hyperpnea.

Because the C fiber endings are close to pulmonary vessels, they have been called J (juxtacapillary) receptors. They are stimulated by hyperinflation of the lung, but they respond as well to intravenous or intracardiac administration of chemicals such as capsaicin. The reflex response that is produced is apnea followed by rapid breathing, bradycardia, and hypotension (pulmonary chemoreflex). A similar response is produced by receptors in the heart (Bezold-Jarisch reflex or the coronary chemoreflex; The physiologic role of this reflex is uncertain, but it probably occurs in pathologic states such as pulmonary congestion or embolization, in which it is produced by endogenously released substances.
Reply With Quote Quick reply to this message
The above post was thanked by:
ashishkabir (09-13-2010), Mondoshawan (12-19-2010), Panc4 (12-22-2014)


Physiology-, Respiratory-

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
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.
Where you live. Leave blank if you don't want to tell.


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
Which nerve must be severed? Kabutar111 USMLE Step 1 Forum 1 08-09-2010 07:35 PM
Gag reflex Graymess USMLE Step 2 CS Forum 2 06-25-2010 07:25 AM
Pupillary light reflex just_md USMLE Step 1 Forum 7 05-18-2010 04:17 AM
Facial Nerve Branches lee-usmle USMLE Step 1 Mnemonics 2 10-04-2009 02:53 AM
spinal nerve number repon32 USMLE Step 1 Forum 2 09-15-2009 08:54 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 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)