| intracranial part of optic nerve | <anatomy, nerve> The portion of the optic nerve between the optic canal and the optic chiasm. Synonym: pars intracranialis nervi optici. (05 Mar 2000) |
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| intracranial part of vertebral artery | See: vertebral artery. (05 Mar 2000) |
| intralaminar part of optic nerve | <anatomy, nerve> The portion of the optic nerve as it passes through the lamina cribrosa of the sclera. Synonym: pars intralaminaris nervi optici. (05 Mar 2000) |
| intralobar part of the right superior pulmonary vein | <anatomy, vein> The vein draining the apical and posterior segments of the right lung; tributary to the posterior branch of the right superior pulmonary vein. Synonym: pars intralobaris venae pulmonalis dextrae superioris. (05 Mar 2000) |
| intraocular part of optic nerve | <anatomy, nerve> The part of the optic nerve within the eye; it is divided into intralaminar, postlaminar, and prelaminar parts. Synonym: pars intraocularis nervi optici. (05 Mar 2000) |
| intrasegmental part | A vein emerging from the bronchopulmonary segment it drains; a tributary to a branch of a pulmonary vein. Synonym: pars intrasegmentalis, intrasegmental part. (05 Mar 2000) |
| iridial part of retina | iridial part of retina |
| oblique part of cricothyroid muscle | <anatomy> See: cricothyroid muscle. Synonym: pars obliqua musculi cricothyroidei. (05 Mar 2000) |
| occipital part of corpus callosum | Occipital radiation of the corpus callosum; that part of the fibre radiation of the corpus callosum which bends sharply backward into the occipital lobe of the cerebrum. Synonym: forceps major, forceps posterior, occipital part of corpus callosum, pars occipitalis corporis callosi. (05 Mar 2000) |
| opercular part | One of the three small cortical convolutions together forming a cover for the insular region. Opercular convolutions are frontal, temporal, and parietal. Synonym: pars opercularis. (05 Mar 2000) |
| optic part of retina | The internal layer of the retina containing the neural elements, as distinguished from the outer leaf of the retina, or pigmented layer. Synonym: pars optica retinae, neural layer of retina, optic part of retina, stratum cerebrale retinae. (05 Mar 2000) |
| oral part of pharynx | The area of the throat at the back of the mouth. (12 Dec 1998) |
| orbital part of frontal bone | The portion of the frontal bone that contributes to the formation of the orbits; the most rostral of three cortical convolutions that togetther form the inferior frontal gyrus. Synonym: pars orbitalis ossis frontalis. (05 Mar 2000) |
| orbital part of lacrimal gland | See: lacrimal gland. (05 Mar 2000) |
| orbital part of optic nerve | <anatomy, nerve> The part of the optic nerve between the eye and the optic canal. Synonym: pars orbitalis nervi optici. (05 Mar 2000) |