Action of the pterygoideus muscle during feeding in the lizard Uromastix aegyptius (Agamidae)

G. S. Throckmorton

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The actions of the deep and superficial portions of the pterygoideus muscle and the depressor mandibulae were studied in the agamid lizard, Uromastix aegyptius, using fine wire electrodes. The EMG signals were recorded, while simultaneously recording the jaw positions during feeding on movie film at 32 fps. Muscle activity varies with different types of food. The deep and superficial portions of the pterygoideus performed different functions. The deep pterygoideus functioned during opening of the jaws, presumably to protract the jaw. The superficial pterygoideus was strictly a jaw elevator. The depressor mandibulae is not the initiator of jaw opening. When biting on tough food items, the deep pterygoideus and depressor mandibular were active.

Original languageEnglish (US)
Pages (from-to)217-222
Number of pages6
JournalAnatomical Record
Volume190
Issue number2
StatePublished - 1978

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Agamidae
Lizards
Jaw
jaws
lizard
lizards
muscle
Muscles
muscles
food
Motion Pictures
electrode
Elevators and Escalators
elevators
Food
wire
electrodes
Electrodes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Anatomy

Cite this

Action of the pterygoideus muscle during feeding in the lizard Uromastix aegyptius (Agamidae). / Throckmorton, G. S.

In: Anatomical Record, Vol. 190, No. 2, 1978, p. 217-222.

Research output: Contribution to journalArticle

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