| posterior canaliculus of chorda tympani | A canal leading from the facial canal to the tympanic cavity through which the chorda tympani nerve enters this cavity. Synonym: canaliculus chordae tympani, iter chordae posterius, small canal of chorda tympani. (05 Mar 2000) |
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| secretory canaliculus | See: intercellular canaliculus, intracellular canaliculus. (05 Mar 2000) |
| intercellular canaliculus | One of the fine channels between adjoining secretory cells, such as those between serous cells in salivary glands. (05 Mar 2000) |
| intracellular canaliculus | <cell biology> A fine canal formed by invagination of the cell membrane into the cytoplasm of a cell, such as those of the parietal cells of the stomach. (05 Mar 2000) |
| tympanic canaliculus | A minute canal passing from the inferior surface of the petrous portion of the temporal bone between the jugular fossa and carotid canal to the floor of the tympanic cavity. Located in the wedge of bone separating the jugular canal and carotid canal, it transmits the tympanic branch of the glossopharyngeal nerve. Synonym: canaliculus tympanicus, Jacobson's canal, tympanic canal. (05 Mar 2000) |
| external aperture of cochlear canaliculus | The external opening of the cochlear aqueduct on the temporal bone medial to the jugular fossa. Synonym: apertura externa canaliculi cochleae. (05 Mar 2000) |
| lacrimal canaliculus | A curved canal beginning at the lacrimal punctum in the margin of each eyelid near the medial commissure and running transversely medially to empty with its fellow into the lacrimal sac. Synonym: canaliculus lacrimalis. (05 Mar 2000) |
| aperture of mastoid antrum | The orifice leading from the epitympanic recess to the mastoid antrum. Synonym: aditus ad antrum. (05 Mar 2000) |
| mastoid | A bony process off the base of the skull that is composed of air cells. Inflammation of the mastoid is known as mastoiditis. (27 Sep 1997) |
| mastoid abscess | An abscess of the mastoid air cells. (05 Mar 2000) |
| mastoid air cells | Numerous small intercommunicating cavities in the mastoid process of the temporal bone that empty into the mastoid or tympanic antrum. Synonym: cellulae mastoideae, mastoid cells, mastoid sinuses. (05 Mar 2000) |
| mastoid angle of parietal bone | The posteroinferior point of the parietal bone. Synonym: angulus mastoideus ossis parietalis. (05 Mar 2000) |
| mastoid antrum | A cavity in the petrous portion of the temporal bone, communicating posteriorly with the mastoid cells and anteriorly with the epitympanic recess of the middle ear via the aperture of the mastoid antrum. Synonym: antrum mastoideum, tympanic antrum, Valsalva's antrum. (05 Mar 2000) |
| mastoid artery | <anatomy, artery> Mastoid branch of occipital artery, passing through the mastoid foramen; distribution, mastoid air cells; anastomosis, middle meningeal artery. Synonym: arteriae occipitalis, ramus mastoideus arteriae occipitalis, mastoid branch of occipital artery. (05 Mar 2000) |
| mastoid bone | The nipple-like projection of the petrous part of the temporal bone. Synonym: processus mastoideus, mastoid bone, temporal apophysis. (05 Mar 2000) |