Author: Glossary
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Pillar cell
One of two groups of cells (inner and outer) resting on the basement membrane of the organ of Corti in which elongated bodies (pillars) develop. These enclose the inner tunnel (Corti’s tunnel).
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Birth control pill
A class of medicines taken orally to control conception. They contain synthetic forms of estrogen and progesterone or synthetic progesterone alone.
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Piliation
The formation and development of hair. The creation and generation of hair.
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Pili trianguli et canaliculi
A condition in which the hair shaft is triangular in cross-section and often has a groove; seen in children with uncombable hair syndrome.
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Pili torti
A condition in which hairs are broken and twisted.
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Pili incarnati
The condition of ingrowing hair, especially in the beard area.
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Pigmentum nigrum
The black pigment of the lamina vitrea of the choroid of the eye.
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Pigmentolysin
A substance that destroys a pigment.
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Hematogenous pigmentation
Pigmentation produced by the collection of hemoglobin, or pigment carried to a site through the blood.
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Visual pigment
A light-absorbing compound in the photoreceptor cells of the retina that converts light energy into a nerve impulse that is passed from the receptor cells to the optic nerve.