Pineal Body


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Related to Pineal Body: cerebral aqueduct, Corpora quadrigemina

pineal body

[′pin·ē·əl ‚bäd·ē]
(anatomy)
An unpaired, elongated, club-shaped, knoblike or threadlike organ attached by a stalk to the roof of the vertebrate forebrain. Also known as conarium; epiphysis.

Pineal Body

 

(also called pineal eye), an eyelike organ in some higher fishes, such as dipnoans and some holosteans, and in such reptiles as the tuatara and many lizards. It develops from an outgrowth of the roof of the diencephalon and communicates with the diencephalon by means of an unpaired nerve. The structure of the pineal body is particularly similar to that of the ordinary paired eye in reptiles: their pineal body has a crystalline lens that faces the parietal foramen in the roof of the skull and that has a multilayered retina with photosensitive and pigmentary cells. The pineal body in some lizards perceives differences in light. The pineal body is reduced in higher vertebrates.

References in periodicals archive ?
The central parts of the transverse fissure deepen to form triangular fossa occupied by the pineal body. Meanwhile the tip of the rostral pole gave access to the small olfactory bulb.
Calcium deposition may normally be seen in the choroid plexus, pineal body, falx and Pacchionian bodies: many pathological conditions may also result in calcification.6 Differential diagnoses of intraparenchymal-calcified lesions include metabolic disorders (hyperparathyroidism, lead poisoning), infectious disorders (cytomegalovirus infection, toxoplasmosis, tuberculomas), neoplasms (ependymoma, oligodendroglioma), and vascular malformation, including Sturge-Weber syndrome and pial arteriovenous malformation.7
The pineal gland, also known as pineal body, is a medium and odd endocrine organ, which originates in the second month of intrauterine life (Macchi & Bruce, 2004) as a diencephalon roof evagination with a conical shape (Bertolucci & Foa, 2004), is aimed antero-posterior and rests on the path that separates the upper colliculus of the posterior wall of the third ventricle and is joined habenular and posterior commissures (Rouviere & Delmas, 1999).