Sponge

Front 1

spicules

Back 1

one of the minute calcareous or silicewous skeletal bodies found in sponges

Front 2

ostia

Back 2

the only body opening of these unusal animals are pores, usually many tiny ones

Front 3

oscula

Back 3

for incoming water, and afew large ones

Front 4

choanocytes

Back 4

These openings are connected by a system of canals, some of which are lined with peculiar flagellated collar

Front 5

dermal ostia

Back 5

water enters through a multitude of tiny incurrent pores

Front 6

spongocoel

Back 6

water enters through microscopic dermal pores into a large cavity

Front 7

radial canals

Back 7

empty into the spongocoel

Front 8

incurrent canals

Back 8

enters through a large number of dermal ostia into

Front 9

prosopyles

Back 9

filters through tiny openings

Front 10

mesohyl

Back 10

sponge cells are losely arranged in a gelatinous matrix

Front 11

pinacocyte

Back 11

neaerest approch to a true tissue in sponges is arrangement of the

Front 12

myocytes

Back 12

usually arranged in circular bands

Front 13

choanocytes

Back 13

which lines flagellated canals and chambers, are ovoid cells with one end embeded and the other exposed

Front 14

can differiate into any of the other types of more specialized cells in the sponge

Back 14

sclerocytes

Front 15

spongocytes

Back 15

secrete ther spongin fibers of the skeleton

Front 16

collencytes

Back 16

secrete fibrillar collagen

Front 17

lophocytes

Back 17

secrete large quanities of collagen but are distinguishable morphologically from collencytes

Front 18

intracellular

Back 18

occurs with in cells.