orbiculare

The tympanum contains four small delicate bones, viz. the malleus, the incus, the stapes, and the os orbiculare, joined to the incus.

The Mirror of Literature, Amusement, and Instruction Volume 13, No. 376, June 20, 1829 Various

A chain of small bones, the malleus (m.), the incus (i.), the os orbiculare (o. or.), a very small bone, and a stirrup-shaped stapes, swing across the tympanum, from the tympanic membrane to the internal ear.

Text Book of Biology, Part 1: Vertebrata 1906

Hidden by the bulla, and just external to the periotic bone, are the auditory ossicles, the incus, malleus, os orbiculare, and stapes.

Text Book of Biology, Part 1: Vertebrata 1906

Agassiz mentions a fourth, which he terms the _os orbiculare_.

The People's Common Sense Medical Adviser in Plain English or, Medicine Simplified, 54th ed., One Million, Six Hundred and Fifty Thousand Ray Vaughn Pierce 1877

A tremulous motion, being excited in this membrane, is communicated to the malleus annexed to it, which communicates it to the incus, by which it is propagated through the os orbiculare to the stapes, which imparts this tremulous motion through the foramen ovale to the fluid contained in the labyrinth.

Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease Thomas Garnett 1784

These two bones are connected by a small oval shaped bone, called os orbiculare, placed between them: the whole forming a little chain of bones.

Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease Thomas Garnett 1784

Distinctive vertebrate species include: eastern cottontail (Sylvilagus floridanus), common opossum (Didelphis virginiana), striped skunk (Mephitis mephitis), Chihuahuan desert horned lizard (Phrynosoma orbiculare), and Sierra Madre sparrow (Xenospiza baileyi).

Zacatonal 2007