Glossary

membranous

Relating to, composed of or similar to a membrane.

Used in 8 species profiles

fin
Membranous appendage supported by cartilage or bony rays. Used for locomotion, steering, and balance by fishes and some other aquatic organisms.
fontanelle
Non-ossified, usually membranous gap between cranial bones.
membrane
Thin, usually flexible layer of tissue covering, lining, separating, or connecting cells or parts of an organism.
peritoneum
Membranous sac lining the abdominal cavity, the pigmentation of which is sometimes used in identification of fish larvae.
skin
In vertebrates, the thin, membranous layer of external tissue forming the protective covering of the body.
yolk sac
A membranous sac containing yolk attached to the ventral surface of embryos and early larvae in some fishes. Retained for a period post-hatching in those species which form yolk sac larvae.