layer - thin structure composed of a single thickness of cells

apodeme - ridge-like ingrowth of the exoskeleton of an arthropod that supports internal organs and provides attachment points for muscles

caliculus, calycle, calyculus - a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp)

tooth - toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell

pad - the foot or fleshy cushion-like underside of the toes of an animal

branchial cleft, gill cleft, gill slit - one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes

branchial arch, gill arch, gill bar - one of the bony or cartilaginous arches on each side of the pharynx that support the gills of fishes and aquatic amphibians

peristome - region around the mouth in various invertebrates

syrinx - the vocal organ of a bird

body part - any part of an organism such as an organ or extremity

bulb - a rounded dilation or expansion in a canal or vessel or organ

carina - any of various keel-shaped structures or ridges such as that on the breastbone of a bird or that formed by the fused petals of a pea blossom

cauda - any taillike structure

chiasm, chiasma, decussation - an intersection or crossing of two tracts in the form of the letter X

cingulum - (anatomy) an encircling girdle-like structure (as the ridge around the base of a tooth)

concha - (anatomy) a structure that resembles a shell in shape

filum, filament - a threadlike anatomical structure or chainlike series of cells

germ - a small simple structure (as a fertilized egg) from which new tissue can develop into a complete organism

infundibulum - any of various funnel-shaped parts of the body (but especially the hypophyseal stalk)

interstice - a small structural space between tissues or parts of an organ; "the interstices of a network"

landmark - an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken

limbus - a border or edge of any of various body parts distinguished by color or structure

rib - a riblike supporting or strengthening part of an animal or plant

blade - a broad flat body part (as of the shoulder or tongue)

radicle - (anatomy) a small structure resembling a rootlet (such as a fibril of a nerve)

plexus, rete - a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels

tube-shaped structure, tube - (anatomy) any hollow cylindrical body structure

passageway, passage - a path or channel or duct through or along which something may pass; "the nasal passages"

fundus - (anatomy) the base of a hollow organ or that part farthest from its opening; "the uterine fundus"

funiculus - any of several body structure resembling a cord

head - that part of a skeletal muscle that is away from the bone that it moves

bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body

tooth root, root - the part of a tooth that is embedded in the jaw and serves as support

capsule - a structure that encloses a body part

uvea - the part of the eye that contains the iris and ciliary body and choroid

membranous labyrinth - the sensory structures of the inner ear including the labyrinthine receptors and the cochlea; contained within the bony labyrinth

bony labyrinth, osseous labyrinth - cavity in the petrous part of the temporal bone that contains the membranous labyrinth

glans - a small rounded gland-like structure; especially that at the end of the penis or clitoris

alveolar bed - lung tissue densely packed with alveoli

valve - a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

vascular structure - a structure composed of or provided with blood vessels

lacrimal apparatus - the structures that secrete and drain tears from the eye

cytoskeleton - a microscopic network of actin filaments and microtubules in the cytoplasm of many living cells that gives the cell shape and coherence