sclera

the white of the eyes, the tough outer coat covering the eyeball except for the cornea. "Individuals of the Caitian species have yellow scleras."

cyst

pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an…

proboscis

elongated oral or nasal appendage from the head of an animal. In invertebrates, usually tubular mouthparts. In vertebrates, an elongated nose or snout. Klingon has…

umbilical cord

long connecting mass between the developing embryo or fetus and the placenta: 'Do Klingon newborns cry when their umbilical cords are cut?'

placenta

organ in most mammals — supplies food and oxygen to the foetus and passes back waste during gestation — attached to the wall of the…

exoskeleton

hard outer structure that provides both structure and protection to creatures such as insects and crustaceans (and perhaps exotic alien life). May also refer to…

retina

the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs

sperm(atozoon)

often motile gamete which fertilizes the egg in sexual reproduction

cholesterol

lipid biomolecule synthesized by all animal cells; an essential component of animal cell membranes

anus

the opening of the GI tract where solid waste is expelled