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Majors animal: Internal anatomy of the lamprey EC (matching)

Olfactory sac Enlarged, internal chamber of the nostril containing a sensory epithelium that allows the lamprey to "smell" dissolved chamicals in the surrounding water
Pindeal organ Photosensory organ located posterior to the nostril; controls many of the lamprey's activities that are dependent on photoperiod
Eye Image-forming photoreceptive organs that lack eyelids; each eye contains a lens and a pigmented retinal layer homologous to those present in other vertebrates
Brain Center of neural control; partitioned into a cerebrum, cerebellum, and medulla oblongata
Notochord Primary axial support element for the body
Spinal cord Posterior extension of the brain that lies dorsal to the notochord and contains spinal nerves
Hypophyseal sac Terminal region of the nostril that circulates water through the nostril and over the olfactory epithelium to facilitate olfaction
Tongue (with teeth) Muscular organ in the oral cavity that rasps through the body wall of the host to create seeping wounds for the lamprey to feed
Oral gland Secretes anticoagulating agent during feeding that prevents the host's blood from clotting and promotes blood flow
Gill filaments Highly vascular structures for gas exchange with the bloodstream
Branchial pouch Respiratory chamber that houses the gill filaments and receives water from the external gill slits
Heart Two-chambered organ (one atrium, one ventricle) that pumps deoxygenated blood to the gills for oxygenation and from the gills throughout the various organ systems of the body
Sinus venosus Thin-walled sac where deoxygenated blood from the body collects before being passed into the atrium of the heart
Transverse septum Partition that separates the coelom into the pericardial cavity and the pleuroperitoneal cavity
Dorsal aorta Channels oxygenated blood from the gills to the posterior regions of the body
Ventral aorta Channels blood from the heart to the gills for oxygenation
Esophagus Transports food to intestine
Intestine Primary site of nutrient absorption
Liver Accessory digestive organ that produces digestive compounds and detoxifies many constituents of the absorbed digested compounds
Kidneys Paired, flattened excretory organs that filter nitrogenous wastes from the blood
Created by: scandalouscanine