from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Situated around the ear.
- adjective Of or relating to the bones immediately around the inner ear.
from The Century Dictionary.
- Surrounding and containing the inner ear, or essential organ ofhearing; composing or entering into the formation of the otic capsule, or otocrane; otocranial; petromastoid; petrosal or petrous.
- noun A periotic bone.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Anat.) Surrounding, or pertaining to the region surrounding, the internal ear.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective anatomy Surrounding, or pertaining to the region surrounding, the
- noun A
bonein the internal ear.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Between the ex-occipital and ali-sphenoid there is wedged in a bone, the periotic
In the lower forms it is a hollow membranous structure, embedded in a mass of cartilage, the otic capsule; in the mammal the latter is entirely ossified, to form the periotic bone.
The eighth nerve runs from the brain case (Cr.), into the periotic bone, and is distributed to the several portions of this labyrinth.
The cerebellum (metencephalon) consists of a central mass, the vermis (v. cbm.), and it also has lateral lobes (l.l.), prolonged into flocculi (f. cbm.), which lastare - em-bedded in pits, [in] the periotic bone, and on that account render the extraction of the brain from the cranium far more difficult than it would otherwise be.
One centre of ossification in the frog forming pro-otic; several fuse together and form periotic of the dog.
A closer approximation to the state of the case will be reached if the student will imagine the maxilla raised up so as to overlie and hide the palatine and presphenoid, the squamosal similarly overlying the periotic bone, and the jugal reaching between them.
In the external view (Figure 3) the bulla hides the periotic bone from without.
The seventh nerve (facial) is almost entirely motor; it passes through the periotic anterior to VIII., and emerges by the stylo-mastoid foramen (s.m.f.) behind the bulla, to run outside the great jaw muscle across the cheek immediately under the skin (Figure 1).
Take the head of a rabbit, the brain of which has been hardened by spirit, and carefully remove cranium; be particularly careful in picking away the periotic bone, on account of the flocculi of cerebellum.
The eighth nerve (auditory) is purely sensory, the nerve of the special sense of hearing; it runs into the periotic bone, and breaks up on the labyrinth.
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