Comparison of isometric contractile properties of the tongue muscles in three species of frogs, Litoria caerulea, Dyscophus guinetti, and Bufo marinus

Susan E. Peters, Kiisa C Nishikawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Previous studies show that anurans feed in at least three different ways. Basal frogs have a broad tongue that shortens during protraction and emerges only a short distance from the mouth. Some frogs have long, narrow tongues that elongate dramatically due primarily to inertia from mouth opening, which is transferred to the tongue. A few species have a hydrostatic mechanism that produces tongue elongation during protraction. This functional diversity occurs among frogs that share the same two pairs of tongue muscles. Our study compares the isometric contractile properties of these tongue muscles among three frog species that represent each feeding mechanism. Nerves to the paired protractors and retractors were stimulated electrically in each species to record the force properties, contraction speeds, and fatigabilites of these muscles. Few differences were found in the isometric contractile properties of tongue muscles, and the greatest differences were found in the retractors, not the protractors. We propose that the unique arrangement of the tongue muscles in frogs results in a retractor that may also be coactivated with the protractor in order to produce normal tongue protraction. Inertial effects from body, head, and jaw movements, along with clear differences that we found in passive resistance of the tongues to elongation, may explain much of the behavioral variation in tongue use among species.

Original languageEnglish (US)
Pages (from-to)107-124
Number of pages18
JournalJournal of Morphology
Volume242
Issue number2
DOIs
StatePublished - Nov 1999

Fingerprint

Bufo marinus
tongue
Tongue
Anura
frogs
Muscles
muscles
Mouth
mouth
Litoria
Dyscophus
Head Movements
functional diversity
Jaw
jaws
nerve tissue

Keywords

  • Anura
  • Contractile properties
  • Tongue muscles

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Developmental Biology
  • Anatomy

Cite this

@article{a5b11c653386471390469ce8becf1194,
title = "Comparison of isometric contractile properties of the tongue muscles in three species of frogs, Litoria caerulea, Dyscophus guinetti, and Bufo marinus",
abstract = "Previous studies show that anurans feed in at least three different ways. Basal frogs have a broad tongue that shortens during protraction and emerges only a short distance from the mouth. Some frogs have long, narrow tongues that elongate dramatically due primarily to inertia from mouth opening, which is transferred to the tongue. A few species have a hydrostatic mechanism that produces tongue elongation during protraction. This functional diversity occurs among frogs that share the same two pairs of tongue muscles. Our study compares the isometric contractile properties of these tongue muscles among three frog species that represent each feeding mechanism. Nerves to the paired protractors and retractors were stimulated electrically in each species to record the force properties, contraction speeds, and fatigabilites of these muscles. Few differences were found in the isometric contractile properties of tongue muscles, and the greatest differences were found in the retractors, not the protractors. We propose that the unique arrangement of the tongue muscles in frogs results in a retractor that may also be coactivated with the protractor in order to produce normal tongue protraction. Inertial effects from body, head, and jaw movements, along with clear differences that we found in passive resistance of the tongues to elongation, may explain much of the behavioral variation in tongue use among species.",
keywords = "Anura, Contractile properties, Tongue muscles",
author = "Peters, {Susan E.} and Nishikawa, {Kiisa C}",
year = "1999",
month = "11",
doi = "10.1002/(SICI)1097-4687(199911)242:2<107::AID-JMOR4>3.0.CO;2-V",
language = "English (US)",
volume = "242",
pages = "107--124",
journal = "Journal of Morphology",
issn = "0362-2525",
publisher = "John Wiley and Sons Inc.",
number = "2",

}

TY - JOUR

T1 - Comparison of isometric contractile properties of the tongue muscles in three species of frogs, Litoria caerulea, Dyscophus guinetti, and Bufo marinus

AU - Peters, Susan E.

AU - Nishikawa, Kiisa C

PY - 1999/11

Y1 - 1999/11

N2 - Previous studies show that anurans feed in at least three different ways. Basal frogs have a broad tongue that shortens during protraction and emerges only a short distance from the mouth. Some frogs have long, narrow tongues that elongate dramatically due primarily to inertia from mouth opening, which is transferred to the tongue. A few species have a hydrostatic mechanism that produces tongue elongation during protraction. This functional diversity occurs among frogs that share the same two pairs of tongue muscles. Our study compares the isometric contractile properties of these tongue muscles among three frog species that represent each feeding mechanism. Nerves to the paired protractors and retractors were stimulated electrically in each species to record the force properties, contraction speeds, and fatigabilites of these muscles. Few differences were found in the isometric contractile properties of tongue muscles, and the greatest differences were found in the retractors, not the protractors. We propose that the unique arrangement of the tongue muscles in frogs results in a retractor that may also be coactivated with the protractor in order to produce normal tongue protraction. Inertial effects from body, head, and jaw movements, along with clear differences that we found in passive resistance of the tongues to elongation, may explain much of the behavioral variation in tongue use among species.

AB - Previous studies show that anurans feed in at least three different ways. Basal frogs have a broad tongue that shortens during protraction and emerges only a short distance from the mouth. Some frogs have long, narrow tongues that elongate dramatically due primarily to inertia from mouth opening, which is transferred to the tongue. A few species have a hydrostatic mechanism that produces tongue elongation during protraction. This functional diversity occurs among frogs that share the same two pairs of tongue muscles. Our study compares the isometric contractile properties of these tongue muscles among three frog species that represent each feeding mechanism. Nerves to the paired protractors and retractors were stimulated electrically in each species to record the force properties, contraction speeds, and fatigabilites of these muscles. Few differences were found in the isometric contractile properties of tongue muscles, and the greatest differences were found in the retractors, not the protractors. We propose that the unique arrangement of the tongue muscles in frogs results in a retractor that may also be coactivated with the protractor in order to produce normal tongue protraction. Inertial effects from body, head, and jaw movements, along with clear differences that we found in passive resistance of the tongues to elongation, may explain much of the behavioral variation in tongue use among species.

KW - Anura

KW - Contractile properties

KW - Tongue muscles

UR - http://www.scopus.com/inward/record.url?scp=0033230409&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033230409&partnerID=8YFLogxK

U2 - 10.1002/(SICI)1097-4687(199911)242:2<107::AID-JMOR4>3.0.CO;2-V

DO - 10.1002/(SICI)1097-4687(199911)242:2<107::AID-JMOR4>3.0.CO;2-V

M3 - Article

VL - 242

SP - 107

EP - 124

JO - Journal of Morphology

JF - Journal of Morphology

SN - 0362-2525

IS - 2

ER -