| tegmen ventriculi quarti | Roof of fourth ventricle, formed in its upper part by the superior medullary velum stretching between the two brachia conjunctiva (superior cerebellar peduncles), in its lower part by the inferior medullary velum composed of the choroid membrane and choroid plexus of the fourth ventricle. Synonym: roof of fourth ventricle. (05 Mar 2000) |
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| apertura lateralis ventriculi quarti | One of the two lateral openings of the fourth ventricle into the subarachnoid space at the cerebellopontine angle. Synonym: apertura lateralis ventriculi quarti, foramen lateralis ventriculi quarti, foramen of Key-Retzius, foramen of Luschka, Retzius' foramen. (05 Mar 2000) |
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| apertura mediana ventriculi quarti | The large midline opening in the posterior inferior part of the roof of the fourth ventricle, connecting the ventricle with the cerebellomedullary cistern. Synonym: apertura mediana ventriculi quarti, arachnoid foramen, Magendie's foramen, median aperture of the fourth ventricle. (05 Mar 2000) |
| ramus choroidei ventriculi quarti | Fourth ventricle choroid branch of posterior inferior cerebellar artery. See: choroid branches. (05 Mar 2000) |
| vena recessus lateralis ventriculi quarti | A small vein originating in the cerebellar tonsil, coursing by the lateral recess of the fourth ventricle on its way to terminate in the petrosal vein. Synonym: vein of lateral recess of fourth ventricle. (05 Mar 2000) |
| recessus lateralis ventriculi quarti | The narrow recess of the ventricle that extends laterally over, and down along the side of, the inferior cerebellar peduncle and the overlying cochlear nuclei; at its tip it opens by way of Luschka's foramen into the interopeduncular cistern of the subarachnoid space. By way of this recess, part of the choroid plexus of the fourth ventricle protrudes into the subarachnoid space. Synonym: recessus lateralis ventriculi quarti. (05 Mar 2000) |
| plexus choroideus ventriculi quarti | One of two vascular fringes of pia mater projecting on either side from the lower part of the roof of the fourth cerebral ventricle. Synonym: plexus choroideus ventriculi quarti. (05 Mar 2000) |
| striae medullares ventriculi quarti | Slender fascicles of fibres extending transversally below the ependymal floor of the ventricle from the median sulcus to enter the inferior cerebellar peduncle. They arise from the arcuate nuclei on the ventral surface of the medullary pyramid. Synonym: striae medullares ventriculi quarti, acoustic striae, auditory striae, Bergmann's cords, medullary teniae, teniae acusticae. (05 Mar 2000) |
| sulcus medianus ventriculi quarti | <anatomy> The shallow midline groove in the floor of the ventricle. Synonym: sulcus medianus ventriculi quarti. (05 Mar 2000) |
| tela choroidea ventriculi quarti | The sheet of pia mater covering the lower part of the ependymal roof of the fourth ventricle. Synonym: tela choroidea ventriculi quarti, tela choroidea inferior. (05 Mar 2000) |
| tenia ventriculi quarti | The line of attachment of the choroid roof to the rim of the fourth ventricle. Synonym: tenia of fourth ventricle. (05 Mar 2000) |
| foramen lateralis ventriculi quarti | One of the two lateral openings of the fourth ventricle into the subarachnoid space at the cerebellopontine angle. Synonym: apertura lateralis ventriculi quarti, foramen lateralis ventriculi quarti, foramen of Key-Retzius, foramen of Luschka, Retzius' foramen. (05 Mar 2000) |
| tegmen | Origin: L, fr. Tegere, tectum, to cover. 1. A tegument or covering. 2. <botany> The inner layer of the coating of a seed, usually thin and delicate; the endopleura. 3. <zoology> One of the elytra of an insect, especially of certain Orthoptera. 4. <zoology> Same as Tectrices. Source: Websters Dictionary (01 Mar 1998) |
| tegmen cruris | Old term for tegmentum mesencephali. (05 Mar 2000) |
| tegmen mastoideum | The lamina of bone roofing over the mastoid cells. (05 Mar 2000) |
| tegmen tympani | The roof of the middle ear, formed by the thinned anterior surface of the petrous portion of the temporal bone. Its anterior edge is inserted into the petrosquamous fissure so that it can be seen as a wedge of bone subdividing that fissure into a squamo tympanic and a petrotympanic fissure. Synonym: roof of tympanum. (05 Mar 2000) |
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