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BIOL212
Majors animal: Internal anatomy of the lamprey EC (matching)
| Structure | Function |
|---|---|
| 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
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