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BIOL212

Majors animal: Anatomy of the lancelet (matching)

AnatomyPhysiology
Myomeres Provide muscular movements for swimming and burrowing
Notochord Provides skeletal support for anchoring myomeres to provide lateral body movements
Dorsal nerve cord Handles majority of nervous coordination without intervention of the brain
Rostrum Anterior projection shielding entrance to the mouth dorsally
Wheel organ Lined with cilia, which produce a current of water that brings food into the mouth
Oral cirri Act as a strainer to exclude larger particles from the mouth (filter feeding)
Pharyngeal gills Have thin mucous coating that traps ingested food particles; also contain blood vessels supplementing gas exchange for respiration
Gill slits Allow for outflow of water from pharynx between gill bars for food capture and respiration
Velum Transverse partition encircling mouth
Pharynx Receives incoming water from the mouth, entraps food in a film of mucus, and is responsible for some gas exchange
Hepatic cecum Lateral outpocket of intestine responsible for intracellular digestion of small food particles and lipid and glycogen storage
Intestine Site of enzymatic digestion of larger food particles
Atrium Ventral body chamber that receives water passed from pharynx through gill slits
Atriopore Discharges water from atrium to external environment
Anus Regulates egestion of undigested food (feces) from the body
Dorsal aortae Paired blood vessels that join behind the pharynx to form the median dorsal aorta, which carries nutrient-laden blood posteriorly to the body tissues and intestine
Nephridia Ciliated ducts that transport metabolic wastes from the dorsal portions of the coelom to the atrium
Testes Produce sperm for external fertilization
Ovaries Produce ova for external fertilization
Created by: scandalouscanine