Bulbocavernosus reflex

Bulbocavernosus reflex

The bulbocavernosus reflex is a polysynaptic reflex that is useful in testing for spinal shock and gaining information about the state of spinal cord injuries (SCI). The test involves monitoring anal sphincter contraction in response to squeezing the glans penis or tugging on an indwelling Foley catheter. [ [http://www.wheelessonline.com/ortho/bulbocavernosus_reflex Bulbocavernosus Reflex - Wheeless' Textbook of Orthopaedics ] ] The reflex is spinal mediated and involves S1-S3. The absence of the reflex without sacral spinal cord trauma indicates spinal shock. Typically this is one of the first reflexes to return after spinal shock. Lack of motor and sensory function after the reflex has returned indicates complete SCI. Absence of this reflex in instances where spinal shock is not suspected could indicate a lesion or injury of the conus medullaris or sacral nerve roots.

This reflex can also be tested electrophysiologically, by stimulating the penis or vulva and recording from the anal sphincter. This test modality is used in intraoperative neurophysiology monitoring to verify function of sensory and motor sacral roots as well as the conus medullaris. [cite journal
last = Vodusek
first = David B.
authorlink =
coauthors = Deletis, Vedran
title = Intraoperative Neurophysiological Monitoring of the Sacral Nervous System
journal = Neurophysiology in Neurosurgery, a Modern Intraoperative Approach
volume =
issue =
pages = 153-165
publisher = Academic Press
location =
date = 2002
url =
doi =
id =
accessdate =


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • bulbocavernosus reflex — bulbospongiosus r …   Medical dictionary

  • Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

  • List of sexology topics — This is a list of topics related to sexology, human sexuality and marriage customs, and related topics such as human sexual anatomy, reproductive biology, andrology, gynaecology, obstetrics and, where relevant, anthropology. Note that this list… …   Wikipedia

  • Spinal shock — was first defined by Whytt in 1750 as a loss of sensation accompanied by motor paralysis with initial loss but gradual recovery of reflexes, following a spinal cord injury (SCI) most often a complete transection. Reflexes in the spinal cord… …   Wikipedia

  • Erectile dysfunction — Impotent redirects here. For the classification of poverty, see impotent poor. Erectile dysfunction Classification and external resources ICD 10 F52.2, N48.4 …   Wikipedia

  • Anorgasmia — Classification and external resources ICD 10 F52.3 ICD 9 302.73 …   Wikipedia

  • BCR — B cell reactivity; birth control regimen; breakpoint cluster region; bromocriptine; bulbocavernosus reflex …   Medical dictionary

  • BCR — • B cell reactivity; • birth control regimen; • breakpoint cluster region; • bromocriptine; • bulbocavernosus reflex …   Dictionary of medical acronyms & abbreviations

  • Muscle — is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart… …   Medical dictionary

  • Onuf's nucleus — Medulla spinalis Substantia grisea (Onuf s nucleus not labeled, but region is visible) Latin nucleus nervi pudendi …   Wikipedia