| pineal eye | A non-image-forming, photoreceptive eye in or near the median line in certain crustacea and lower vertebrates; homologue of pineal gland in higher forms. Synonym: epiphysial eye, parietal eye. (05 Mar 2000) |
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| pedunculus of pineal body | See: habenula. (05 Mar 2000) |
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| pineal | A gland-like structure in the brain which appears to be the major site of melatonin biosynthesis. The exact role of the pineal remain obscure. (27 Sep 1997) |
| pineal body | A small conical midline body attached to the posterior part of the third ventricle and lying between the superior colliculi, below the splenium of the corpus callosum. (12 Dec 1998) |
| pineal cells | Cell's of the corpus pineale or pinealocyte. (05 Mar 2000) |
| pineal cyst | A cyst of the pineal gland; rarely of clinical importance. (05 Mar 2000) |
| pineal gland | A small, flat gland found within the brain which produces the hormones melatonin and serotonin. (09 Oct 1997) |
| pineal gland calcification | <radiology> Visible on plain skull film (33-76% in adults), seen more frequently on CT, rare in kids less than 6 y.o. (presence suggests neoplasm), usually in the form of a cluster of amorphous, irregular densities, may be solitary, the size of calcification: usually 3-5 mm, if greater than 1 cm, suspect pinealoma, AV malformation, etc. See: physiological intracranial calcifications (12 Dec 1998) |
| pineal habenula | The peduncle or stalk of the pineal gland. See: habenula. (05 Mar 2000) |
| pineal recess | A diverticulum from the posterior part of the third ventricle extending back between the posterior commissure and the habenular commissure. Synonym: recessus pinealis. (05 Mar 2000) |
| pineal region tumours | Type of brain tumours. (12 Dec 1998) |
| pineal tumours | <radiology> SIGNS: aqueductal obstruction most likely to be hydrocephalus, paralysis of upward gaze (due to pressure on quarigeminal plate), precocious puberty, symptoms of hypothalamic, thalamic, cerebellar or pyramidal lesion TYPES: germ-cell (teratoid) tumours, teratoma, germinoma / atypical teratoma, endodermal sinus (yolk sac) tumour, choriocarcinoma, pineal-cell tumours, pineocytoma, pineo---, others, glioma, ganglioneuroma, ganglioglioma (12 Dec 1998) |
| accessory organs of the eye | The eyelids, with lashes and eyebrows, lacrimal apparatus, conjunctival sac, and extrinsic muscles of the eyeball. Synonym: organa oculi accessoria, accessory organs, accessory visual apparatus, adnexa oculi, appendages of eye. (05 Mar 2000) |
| accommodation of eye | The increase in thickness and convexity of the eye's lens in order to focus the image of an external object upon the retina. (05 Mar 2000) |
| amaurotic cat's eye | A yellow reflex from the pupil in cases of retinoblastoma or pseudoglioma. (05 Mar 2000) |
| anterior chamber of eye | The space between the cornea anteriorly and the iris/pupil posteriorly, filled with a watery fluid (aqueous humor) and communicating through the pupil with the posterior chamber. Synonym: camera anterior bulbi, camera oculi anterior, camera oculi major. (05 Mar 2000) |