JN Track the topics, authors and articles important to you
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Neurophysiol 84: 827-835, 2000;
0022-3077/00 $5.00
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (23)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sokoloff, A. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Sokoloff, A. J.

The Journal of Neurophysiology Vol. 84 No. 2 August 2000, pp. 827-835
Copyright ©2000 by the American Physiological Society

Localization and Contractile Properties of Intrinsic Longitudinal Motor Units of the Rat Tongue

Alan J. Sokoloff

Department of Physiology, Emory University School of Medicine, Atlanta, Georgia 30322

Sokoloff, Alan J. Localization and Contractile Properties of Intrinsic Longitudinal Motor Units of the Rat Tongue. J. Neurophysiol. 84: 827-835, 2000. Tongue dysfunction is a hallmark of many human clinical disorders, yet we lack even a rudimentary understanding of tongue neural control. Here, the location and contractile properties of intrinsic longitudinal motor units (MUs) of the rat tongue body are described to provide a foundation for developing and testing theories of tongue motor control. One hundred and sixty-five MUs were studied by microelectrode penetration and stimulation of individual motor axons coursing in the terminal portion of the lateral (retrusor) branch of the hypoglossal nerve in the rat. Uniaxial MU force was recorded by a transducer attached to the protruded tongue tip, and MU location was estimated by electromyographic (EMG) electrodes implanted into the anterior, middle, and posterior portions of the tongue body. All MUs produced retrusive force. MU twitch force ranged from 2-129 mg (mean = 35 mg) and tetanic force ranged from 9-394 mg (mean = 95 mg). MUs reached maximal twitch force in 8-33 ms (mean = 15 ms) and were resistant to fatigue; following 2 min of stimulation, MUs (n = 11) produced 78-131% of initial force. EMG data were collected for 105 MUs. For 65 of these MUs, the EMG response was confined to a single electrode location: for 26 MUs to the anterior, 21 MUs to the middle, and 18 MUs to the posterior portion of the tongue. Of the remaining MUs, EMG responses were observed in two (38/40) or all three (2/40) tongue regions. These data provide the first contractile measures of identified intrinsic tongue body MUs and the first evidence that intrinsic longitudinal MUs are restricted to a portion of tongue length. Localization of MU territory suggests a role for intrinsic MU in the regional control of the mammalian tongue observed during feeding and speech.




This article has been cited by other articles:


Home page
 J. Neurophysiol.Home page
L. J. Pittman and E. F. Bailey
Genioglossus and Intrinsic Electromyographic Activities in Impeded and Unimpeded Protrusion Tasks
J Neurophysiol, January 1, 2009; 101(1): 276 - 282.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
J. P. Saboisky, J. E. Butler, D. K. McKenzie, R. B. Gorman, J. A. Trinder, D. P. White, and S. C. Gandevia
Neural drive to human genioglossus in obstructive sleep apnoea
J. Physiol., November 15, 2007; 585(1): 135 - 146.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
J. P. Saboisky, J. E. Butler, R. B. Fogel, J. L. Taylor, J. A. Trinder, D. P. White, and S. C. Gandevia
Tonic and Phasic Respiratory Drives to Human Genioglossus Motoneurons During Breathing
J Neurophysiol, April 1, 2006; 95(4): 2213 - 2221.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
A. J. Sokoloff
Activity of tongue muscles during respiration: it takes a village?
J Appl Physiol, February 1, 2004; 96(2): 438 - 439.
[Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
E. F. Bailey and R. F. Fregosi
Coordination of intrinsic and extrinsic tongue muscles during spontaneous breathing in the rat
J Appl Physiol, February 1, 2004; 96(2): 440 - 449.
[Abstract] [Full Text] [PDF]

Home page
 CROBMHome page
K. M. Hiiemae and J. B. Palmer
TONGUE MOVEMENTS IN FEEDING AND SPEECH
Critical Reviews in Oral Biology & Medicine, November 1, 2003; 14(6): 413 - 429.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
S. A. Kinirons, M. S. Shall, J. R. McClung, and S. J. Goldberg
Effect of Artificial Rearing on the Contractile Properties and Myosin Heavy Chain Isoforms of Developing Rat Tongue Musculature
J Neurophysiol, July 1, 2003; 90(1): 120 - 127.
[Abstract] [Full Text] [PDF]

Home page
 CROBMHome page
A. Sawczuk and K.M. Mosier
Neural Control of Tongue Movement With Respect To Respiration and Swallowing
Critical Reviews in Oral Biology & Medicine, January 1, 2001; 12(1): 18 - 37.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online