|
KMID : 0376219850220020229
|
|
Chonnam Medical Journal
1985 Volume.22 No. 2 p.229 ~ p.238
|
|
|
Reflex Action of Semicircular Canals on the Extraocular Superior Rectus and Splenius Capitis Muscles in Rabbits
|
|
|
|
|
Abstract
|
|
|
The present experiment was carried out to compare overall functional organization for vestibule-ocular and vestibulo-collic reflexes in the rabbits. Each semicircular canal nerve was electrically stimulated by means of an electrode inserted into the ampulla, and reflex responses of the extraocular superior rectos muscle and the splenius capotes muscle were recorded in terms of isometric tension and electromyographic activity. The following results were obtained.
1) The superior rectos muscle contracted in response to stimulation of the ipsilateral posterior canal nerve and relaxed in response to stimulation of the contralateral posterior canal.
2) On the contrary, the splenius capotes muscle contracted in response to the contralateral posterior canal stimulation and relaxed in response to the ipsilateral canal.
3) When the ipsilateral eye and neck muscles were tested simultaneously, stimulation of the vertical canals caused responses of the muscles in an opposite pattern. Moreover, separate stimulation of the two vertical canals composing a functional pair elicited reversed responses of the muscles.
4) Similarly, separate stimulation of the bilateral horizontal canals, a functional pair, caused responses of the ipsilateral eye and neck muscles in an opposite pattern.
5) When the contralateral eye and neck muscles were tested together, stimulation of vertical canals produced responses of good correspondence, and changing the laterality of the canal stimulation always reversed the response pattern.
During the vestibule-ocular and vestibulo-collic reflexes elicited by stimulation of each semicircular canal, the superior rectos and splenius capotes muscles revealed reflex responses with contrary pattern. However, it was figured out that the response patterns of the motor neurons of the two muscles must be rather identical. Thus it is suggested that the overall functional interrelation between the receptor organs (canals) and the effectors (the neck and eye muscles) be similar for the two reflex organizations.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|