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The bony labyrinth (also osseous labyrinth or otic capsule) is the rigid, bony outer wall of the inner ear in the temporal bone. It consists of three parts: the vestibule, semicircular canals, and cochlea. These are cavities hollowed out of the substance of the bone, and lined by periosteum.
The first part of the ear to develop is the inner ear, [19] which begins to form from the ectoderm around the embryo's 22nd day, [18] derived from two thickenings called otic placodes on either side of the head. Each otic placode recedes below the ectoderm, forms an otic pit and then an otic vesicle. [20]
In the tetrapod and higher clades from the lower-middle Famennian there are several defining changes on the basis of anatomy of Ichthyostega, Tulerpeton, and Acanthostega. In the cranium, there is a stapes derived from the hyomandibular of fishes; a single bilateral pair of nasal bones, and a fenestra ovalis in the otic capsule of the braincase ...
Otic means pertaining to the ear. It can refer to: Otic ganglion, nerve cells in ear; Otic polyp, benign growth in middle ear; Otic capsule, another name for bony labyrinth; Otic drops, another name for ear drops; Otic notch, notch in skull of some species; Otic pit, developmental stage of ear; Otic placode, developmental stage of ear
Sound is conducted through the oval window to the interior of the otic capsule. [2] This motion ultimately stimulates sensory cells in the inner ear. [3] Depiction of the evolution of the ossicles of the ear. Columella (Co) and extra-columella (E) evolve into the stapes and extra-stapes in embryonic mammals (7). [4]
Otic vesicle, or auditory vesicle, consists of either of the two sac-like invaginations formed and subsequently closed off during embryonic development. It is part of the neural ectoderm , which will develop into the membranous labyrinth of the inner ear.
Otosclerosis is a condition of the middle ear where portions of the dense enchondral layer of the bony labyrinth remodel into one or more lesions of irregularly-laid spongy bone.
The spiral ligament is a fibrous cushion located between the stria vascularis and the bony otic capsule ... 1054 of the 20th edition of Gray's Anatomy (1918 ...