The Project Gutenberg EBook of The Adductor Muscles of the Jaw In Some
Primitive Reptiles, by Richard C. Fox

This eBook is for the use of anyone anywhere at no cost and with
almost no restrictions whatsoever. You may copy it, give it away or
re-use it under the terms of the Project Gutenberg License included
with this eBook or online at www.gutenberg.net

Title: The Adductor Muscles of the Jaw In Some Primitive Reptiles

Author: Richard C. Fox

Release Date: October 24, 2009 [EBook #30321]

Language: English

Character set encoding: ASCII

*** START OF THIS PROJECT GUTENBERG EBOOK ADDUCTOR MUSCLES OF THE JAW ***

Produced by Chris Curnow, Joseph Cooper, Diane Monico, and
the Online Distributed Proofreading Team at
http://www.pgdp.net

UNIVERSITY OF KANSAS PUBLICATIONS

MUSEUM OF NATURAL HISTORY

Volume 12, No. 15, pp. 657-680, 11 figs.
May 18, 1964

The Adductor Muscles of the Jaw
In Some Primitive Reptiles

BY

RICHARD C. FOX

UNIVERSITY OF KANSAS
LAWRENCE
1964

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, Henry S. Fitch,
Theodore H. Eaton, Jr.

Volume 12, No. 15, pp. 657-680, 11 figs.
Published May 18, 1964

UNIVERSITY OF KANSAS
Lawrence, Kansas

PRINTED BY
HARRY (BUD) TIMBERLAKE, STATE PRINTER
TOPEKA, KANSAS
1964

30-1522

The Adductor Muscles of the Jaw
In Some Primitive Reptiles

BY

RICHARD C. FOX

Information about osteological changes in the groups of reptiles that
gave rise to mammals is preserved in the fossil record, but the
musculature of these reptiles has been lost forever. Nevertheless, a
reasonably accurate picture of the morphology and the spatial
relationships of the muscles of many of these extinct vertebrates can
be inferred by studying the scars or other marks delimiting the origins
and insertions of muscles on the skeletons of the fossils and by
studying the anatomy of Recent genera. A reconstruction built by these
methods is largely speculative, especially when the fossil groups are
far removed in time, kinship and morphology from Recent kinds, and when
distortion, crushing, fragmentation and overzealous preparation have
damaged the surfaces associated with the attachment of muscles. The
frequent inadequacy of such direct evidence can be partially offset by
considering the mechanical demands that groups of muscles must meet to
perform a particular m