Majors animal: Internal anatomy of a cephalopod (matching)
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each of the black spaces below before clicking
on it to display the answer.
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| Gills | Paired, feathery organs used for respiration
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| Esophagus | Thin tube connecting the mouth to the stomach
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| Stomach | Small sac where food is stored and digested; digestion is entirely extracellular in cephalopods
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| Pancreas | Small, granular digestive gland that secretes enzymes into the stomach to assist in the breakdown of food
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| Liver | Large, elongated gland that releases secretions into the stomach to facilitate enzymatic digestion of food
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| Cecum | Large, thin-walled digestive chamber prominent along the dorsal end of the body
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| Rectum | Portion of digestive tract leading to anus
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| Ink sac | Large sac that opens into the rectum and secretes a dark brown or black fluid when the animal is alarmed
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| Anus | Terminal portion of digestive tract located near siphon
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| Testis | Produces sperm; located in dorsal end of body tube
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| Vas deferens | Open-ended chamber that receives and stores sperm
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| Spermatophoric gland | Coiled, convoluted tubules that package sperm cells into spermatophore packets
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| Penis | Muscular organ that gathers spermatophores and releases them outisde the body where they are transferred by the male's hectocotylus to the female during mating
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| Ovary | Site of ova production
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| Oviduct | Open-ended chamber that receives ova from the ovary
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| Nidamental glands | Produce secretions that form an encasement around the strings of ova to protect them
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| Retractor muscles | Long muscles that control the retraction of the siphon and the head
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| Kidneys | Paired excretory organs located near the systemic heart that filter nitrogenous wastes from the hemolymph and eliminate them from the body
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| Systemic heart | Large, muscular ventricle that receives oxygenated blood from the gills and pumps it throughout the body
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| Branchial hearts | Smaller, muscular chambers that receive deoxygenated blood from all parts of the body and pump blood to the gills
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