petrous part of temporal bone

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Related to Petrosal bone: petrous

part

 
a division of a larger structure.
mastoid part of temporal bone the posterior portion of the petrous (or petromastoid) part. Called also mastoid bone.
petromastoid part of temporal bone see petrous part of temporal bone.
petrous part of temporal bone the part of the temporal bone located at the base of the cranium, containing the inner ear. Some anatomists divide it into two separate subparts, calling the posterior section the mastoid part, reserving the term petrous part for the anterior section only, and calling the entire area the petromastoid part. Called also petrous bone.
squamous part of temporal bone the flat, scalelike, anterior superior portion of the temporal bone. Called also squamous bone.
tympanic part of temporal bone the part of the temporal bone forming the anterior and inferior walls and part of the posterior wall of the external acoustic meatus. Called also tympanic bone.

pet·rous part of tem·po·ral bone

[TA]
the part of the temporal bone that contains the structures of the inner ear and the second part of the internal carotid artery; in prenatal life it appears as a separate ossification center.

pet·rous part of tem·po·ral bone

(pet'rŭs pahrt tem'pŏr-ăl bōn) [TA]
The part of the temporal bone that contains the structures of the internal ear and the second part of the internal carotid artery; in prenatal life, it appears as a separate ossification center.
References in periodicals archive ?
The petrosal bone protects the organs of hearing and balance.
handleyi, a large surface of the petrosal bone (including the sulcus of the prootic sinus) is exposed through the anteroposteriorly elongated subsquamosal foramen.
These three species share the following three morphological traits that have yet to be analyzed in a broad phylogenetic context: 1) at least in males, all three species have both anterior and posterior accessory cusps on their upper canines; 2) the subsquamosal foramen is anteroposteriorly elongated, exposing a large area of the petrosal bone behind the sulcus of the prootic sinus; and 3) the postglenoid foramen runs posteromedially so that the sulcus of the prootic sinus is not exposed in ventral view.
1999) was used to delete the reconstructed areas of the petrosal bone that cover the bony labyrinth.