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pin·e·al bod·y

a small, unpaired, flattened body, shaped somewhat like a pinecone, attached at its anterior pole to the region of the posterior and habenular commissures and lying in the depression between the two superior colliculi below the splenium of the corpus callosum; it is a glandular structure, composed of follicles containing epithelioid cells and lime concretions called brain sand; despite its attachment to the brain, it appears to receive nerve fibers exclusively from the peripheral autonomic nervous system. It produces melatonin and serotonin.


(pī′nŭs) [L pinus., pine]
The pineal gland.


a genus of coniferous trees in the family Pinaceae.

Pinus cubensis, Pinus ponderosa, Pinus radiata
the leaves of the trees P. ponderosa (western yellow pine), P. radiata and P. cubensis contain isocupressic acid and are abortifacient when fed to cows. See pine needle abortion.
Pinus taeda
the leaves are reported to cause fatal indigestion in cows. Called also loblolly pine.