periotic

/per-ee-oh-tik, -ot-ik/US // ˌpɛr iˈoʊ tɪk, -ˈɒt ɪk //UK // (ˌpɛrɪˈəʊtɪk, -ˈɒtɪk) //

周围环境,周边环境,包皮过长,周边

Definitions

adj.形容词 adjective

1
Anatomy.
- : surrounding the ear.
- : noting or pertaining to certain bones or bony elements that form or help to form a protective capsule for the internal ear.

Thus the auditory or periotic capsules press on the parachordals till they come to be more or less imbedded in them.
Of these the more posterior on each side represents the exoccipital and all three periotic bones.
Three bones, the epi-otic, opisthotic and pro-otic, together form the auditory or periotic capsule of each side.
The periotic has its inner surface marked by important depressions, while both inner and outer surfaces are pierced by foramina.
The tympanic is not fused to the periotic and has a small bulla not filled with cancellous bone.