external (redirected from external parasites)

external /ex·ter·nal/ (ek-ster´nal) situated or occurring on the outside. In anatomy, situated toward or near the outside; lateral.

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ex·ter·nal (k-stûrnl)

adj. Abbr. ext.

Relating to, connected with, or existing on the outside; exterior.

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external

situated or occurring on the outside, toward or near the outside; lateral.

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external elastic membrane

a condensation of elastic fibers separating the media of blood vessels from the adventitia.

external environment

environment outside the animal; includes ambient temperature, wind chill factor, bedding adequacy, stall space, feed and water supply.

external germinal layer

the superficial layer of proliferating neuroepithelial cells on the surface of the embryonic cerebellum.

external inguinal ring

abdominal ring (external).

external parasites

see under individual listings for insects, insect larvae and helminths.

external root sheath

epithelial layer acting as a sheath to the root of hairs; continuous with the germinal matrix at the base of the developing follicle.