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

G. S. Throckmorton

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

The actions of the deep and superficial portions of the ptery‐goideus 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 ptery‐goideus functioned during opening of the jaws, presumably to protract the jaw. The superficial pterygoideus was strictly a jaw elevator. The depressor mandibu‐lae 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
JournalThe Anatomical Record
Volume190
Issue number2
DOIs
StatePublished - Feb 1978

ASJC Scopus subject areas

  • Anatomy
  • Agricultural and Biological Sciences (miscellaneous)

Fingerprint Dive into the research topics of 'Action of the pterygoideus muscle during feeding in the lizard Uromastix aegyptius (Agamidae)'. Together they form a unique fingerprint.

  • Cite this