The chewing cycle in the herbivorous lizard Uromastix aegyptius (Agamidae)

G. S. Throckmorton

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The chewing cycle was examined using cinematography at 32 frames per second (fps) and simultaneous electromyography of selected jaw muscles. Three types of food of various sizes were fed to the animals. Seven feeding behaviours were distinguished and comparisons between the chewing cycles in these behaviours made. The basic chewing cycle consisted of 4 phases: (1) slow opening, (2) fast opening, (3) closing and (4) stationary. The timing of these phases, the maximum gape angle used and the action of the tongue varied with each type of behaviour. Differences in the timing of the chewing cycle were related to both the size and texture of the food and to tongue position. The jaw adductor muscles were active only during closing, but opening muscles were active during fast opening and occasionally also during closing. Some behaviours showed differences in the level of muscle activity. Thus, Uromastix has a complex chewing cycle similar to the mammalian one. It is suggested that the mammalian chewing cycle developed from the reptilian chewing cycle by the addition of transverse movements of the lower jaw.

Original languageEnglish (US)
Pages (from-to)225-233
Number of pages9
JournalArchives of Oral Biology
Volume25
Issue number4
DOIs
StatePublished - 1980

Fingerprint

Lizards
Mastication
Jaw
Muscles
Tongue
Cineradiography
Food
Electromyography
Feeding Behavior

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

The chewing cycle in the herbivorous lizard Uromastix aegyptius (Agamidae). / Throckmorton, G. S.

In: Archives of Oral Biology, Vol. 25, No. 4, 1980, p. 225-233.

Research output: Contribution to journalArticle

@article{bf72b6a5f9b04bc8a21131d3e61474bd,
title = "The chewing cycle in the herbivorous lizard Uromastix aegyptius (Agamidae)",
abstract = "The chewing cycle was examined using cinematography at 32 frames per second (fps) and simultaneous electromyography of selected jaw muscles. Three types of food of various sizes were fed to the animals. Seven feeding behaviours were distinguished and comparisons between the chewing cycles in these behaviours made. The basic chewing cycle consisted of 4 phases: (1) slow opening, (2) fast opening, (3) closing and (4) stationary. The timing of these phases, the maximum gape angle used and the action of the tongue varied with each type of behaviour. Differences in the timing of the chewing cycle were related to both the size and texture of the food and to tongue position. The jaw adductor muscles were active only during closing, but opening muscles were active during fast opening and occasionally also during closing. Some behaviours showed differences in the level of muscle activity. Thus, Uromastix has a complex chewing cycle similar to the mammalian one. It is suggested that the mammalian chewing cycle developed from the reptilian chewing cycle by the addition of transverse movements of the lower jaw.",
author = "Throckmorton, {G. S.}",
year = "1980",
doi = "10.1016/0003-9969(80)90027-8",
language = "English (US)",
volume = "25",
pages = "225--233",
journal = "Archives of Oral Biology",
issn = "0003-9969",
publisher = "Elsevier Limited",
number = "4",

}

TY - JOUR

T1 - The chewing cycle in the herbivorous lizard Uromastix aegyptius (Agamidae)

AU - Throckmorton, G. S.

PY - 1980

Y1 - 1980

N2 - The chewing cycle was examined using cinematography at 32 frames per second (fps) and simultaneous electromyography of selected jaw muscles. Three types of food of various sizes were fed to the animals. Seven feeding behaviours were distinguished and comparisons between the chewing cycles in these behaviours made. The basic chewing cycle consisted of 4 phases: (1) slow opening, (2) fast opening, (3) closing and (4) stationary. The timing of these phases, the maximum gape angle used and the action of the tongue varied with each type of behaviour. Differences in the timing of the chewing cycle were related to both the size and texture of the food and to tongue position. The jaw adductor muscles were active only during closing, but opening muscles were active during fast opening and occasionally also during closing. Some behaviours showed differences in the level of muscle activity. Thus, Uromastix has a complex chewing cycle similar to the mammalian one. It is suggested that the mammalian chewing cycle developed from the reptilian chewing cycle by the addition of transverse movements of the lower jaw.

AB - The chewing cycle was examined using cinematography at 32 frames per second (fps) and simultaneous electromyography of selected jaw muscles. Three types of food of various sizes were fed to the animals. Seven feeding behaviours were distinguished and comparisons between the chewing cycles in these behaviours made. The basic chewing cycle consisted of 4 phases: (1) slow opening, (2) fast opening, (3) closing and (4) stationary. The timing of these phases, the maximum gape angle used and the action of the tongue varied with each type of behaviour. Differences in the timing of the chewing cycle were related to both the size and texture of the food and to tongue position. The jaw adductor muscles were active only during closing, but opening muscles were active during fast opening and occasionally also during closing. Some behaviours showed differences in the level of muscle activity. Thus, Uromastix has a complex chewing cycle similar to the mammalian one. It is suggested that the mammalian chewing cycle developed from the reptilian chewing cycle by the addition of transverse movements of the lower jaw.

UR - http://www.scopus.com/inward/record.url?scp=0018941055&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0018941055&partnerID=8YFLogxK

U2 - 10.1016/0003-9969(80)90027-8

DO - 10.1016/0003-9969(80)90027-8

M3 - Article

C2 - 6934719

AN - SCOPUS:0018941055

VL - 25

SP - 225

EP - 233

JO - Archives of Oral Biology

JF - Archives of Oral Biology

SN - 0003-9969

IS - 4

ER -