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anatomy of an octopusclick to hear

anatomy of an octopus ink sac anus gill kidney heart gonad cecum stomach shell dorsal mantle cavity mantle muscles digestive gland crop poison gland beak skull brain

ink sac click to hear

Reservoir containing an ink-producing gland; when threatened, the octopus releases the ink through the siphon into the water to hide its flight.

anus click to hear

Terminal orifice of the digestive tract enabling ejection of fecal matter.

gill click to hear

Respiratory organ located in the dorsal mantle cavity and covered with ciliated cells; muscles help to circulate water through the gills.

kidney click to hear

Organ secreting urine; it eliminates toxic substances from the body.

heart click to hear

Muscular organ helping blood to circulate.

gonad click to hear

Genital gland producing spermatozoa (sperm) or ova (eggs), depending on the sex of the mollusk.

cecum click to hear

Lateral canal located in the anterior portion of the intestine where especially a part of digestion and fermentation take place.

stomach click to hear

Dilated section of the digestive tract preceding the intestine; it receives food to be digested.

shell click to hear

Small internal calcareous structure produced by the mantle; certain species do not have shells.

dorsal mantle cavity click to hear

Chamber formed of folds of the mantle; it contains the main organs, especially the gills, and connects to the outside.

mantle muscles click to hear

Muscles contracting to force water out of the dorsal mantle cavity through the siphon and allowing the octopus to propel itself through the water.

digestive gland click to hear

Organ producing a secretion that contributes to digestion.

crop click to hear

Large sac located beyond the esophagus, where food is held before being digested in the stomach.

poison gland click to hear

Organ producing an acidic secretion that forms the venom, which the octopus injects into its prey through its beak.

beak click to hear

Corneous formation consisting of a jaw capable of crushing, and allowing the octopus to catch its prey and inject it with venom.

skull click to hear

Bony structure enclosing and protecting the brain.

brain click to hear

Main organ of the nervous system; it is located in the head.