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Definition
| describing the back portion of a structure |
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| describing the lower surface of a structure |
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| describing the mid region of an organism |
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| the sides, left and right |
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| the head end, or the part which moves forward. The cephalized end |
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| the tail end of the animal |
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Definition
| away from the main mass of the body (e.g. fingers) |
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Definition
| near the main mass of the body (e.g. shoulders, thighs) |
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Definition
| toward the middle of the body |
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Definition
| the surface on which the mouth is located |
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Definition
| the surface opposite from that containing the mouth |
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Definition
| the muscles in a mollusc that cause the valves to close, or add to a midline |
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Definition
| low pressure hearts which pump "blood" to the ctenidia in squid |
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Definition
| gland involved in ionic regulation, ridding the body of excess calcium and controlling pH. Found in esophagus of earthworms |
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Definition
| major center of glycogen and fat synthesis and storage in earthworms. Appears as a conspicuous girdle around the intestine in the anterior half of the worm |
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Term
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Definition
| a conspicuous swelling towards the anterior end of worms. Secretes mucous that helps to adhere mating worms. Also allows sperm motility during transfer from testes of one individual to spermatheca of other (for storage and later use in external fertilization) |
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Term
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Definition
| body cavity, arises from the embryonic mesoderm. A true coelem is lined by a tissue called the peritoneum |
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Term
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Definition
| epithelium in ehich the cells elongate and fit together like the pickets in a picket fence. |
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Definition
| specialzied cells found only in the epithelium of cnidarians, produce organelles called nematocytes |
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Term
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Definition
| a large thin walled sac that stores food |
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Definition
| a non-living layer on the outside of an organisms, tending to retard water loss |
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Definition
| having separate sexes, i.e some individuals contain the male reproductive system and other individuals contain the female system |
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Term
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Definition
| innermost of the three embryonic tissue layers first delineated during gastrulation |
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Definition
| the outermost of the tree embryonic tissue layers |
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Definition
| an aggregation of neuron cell bodies |
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Term
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Definition
| inner layer of body wall (endoderm) in cnidarians, includes cells specialized for enzyme secretion which are used in digestion |
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Definition
| internal cavity of cnidarians, lined with gastrodermis and used for digestion and nutrient distribution (is not a coelem) |
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Term
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Definition
| a highly muscularized sac that contracts and grinds food due to presence of small stones |
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Term
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Definition
| having both male and female reproductive systems in the same individual |
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