a small, cone-shaped endocrine organ in the posterior forebrain, secreting melatonin and involved in biorhythms and gonadal development.
a pea-sized organ in the brain, situated beneath the posterior part of the corpus callosum, that secretes melatonin into the bloodstream Technical names epiphysis, epiphysis cerebri
pineal gland n.
See pineal body.
A small gland located near the brain and primarily involved in the production and secretion of the hormone melatonin, which regulates circadian rhythms in many animals, including humans.
pinealocyte pin·e·a·lo·cyte (pĭn’ē-ə-lō-sīt’, pī’nē-, pĭ-nē’-, pī-nē’-) n. A cell of the pineal body having long processes ending in bulbous expansions.
pinealoma pin·e·a·lo·ma (pĭn’ē-ə-lō’mə, pī’nē-) n. pin·e·a·lo·mas or pin·e·a·lo·ma·ta (-mə-tə) A neoplasm derived from the pineal body and characterized by large, round, or polygonal cells with large nuclei and small cells that resemble lymphocytes.
- Pineal stalk
pineal stalk n. The attachment of the pineal body to the roof of the third ventricle, containing the pineal recess of the third ventricle.
[pahy-nap-uh l] /ˈpaɪˌnæp əl/ noun 1. the edible, juicy, collective fruit of a tropical, bromeliaceous plant, Ananas comosus, that develops from a spike or head of flowers and is surmounted by a crown of leaves. 2. the plant itself, having a short stem and rigid, spiny-margined, recurved leaves. 3. Military Slang. a fragmentation hand grenade. […]