11/9/2023 0 Comments Fish heart blood flow diagram![]() Each Cuverian duct is formed by three veins, anterior cardinal sinus, a jugular sinus and a posterior cardinal sinus. The blood is carried to the sinus venosus by right and left ductus Cuvieri. Veins of the venous system carry deoxygenated blood to the sinus venosus. (e) A pair of genital arteries to the gonads. ![]() (d) A few pairs of renal arteries to the kidneys. (c) A number of paired segmental arteries for segmental muscles. (b) A pair of subclavian arteries, each dividing into a pectoral and a pelvic arteries for pectoral and pelvic fins. (a) A coeliaco-mesenteric artery for swim-bladder, stomach, intestine, liver, spleen, etc. The dorsal aorta runs backwards along the ventral side of the vertebral column and enters the tail as caudal artery.Īlong its route, dorsal aorta gives the following arteries: The first efferent branchial artery on either side gives off a cephalic artery which further divides into an external carotid artery that supplies blood to the orbital region, tongue and hyoid arch, and an internal carotid artery goes to the brain. These two communicate with the anterior end of the dorsal aorta. The third and fourth efferent branchial arteries on either side unite to form the posterior epibranchial artery. Both the anterior epibranchial arteries unite posteriorly along the mid-dorsal line to form the dorsal aorta. The first and second efferent branchials on either side unite to form the anterior epibranchial artery. Like afferent branchial arteries, efferent branchial arteries are also four pairs. They carry oxygenated blood to the different parts of the body and not to the heart. All these four pairs of afferent branchials carry deoxygenated blood to the gills. The second, third and fourth pairs of afferent branchial arteries originate independently behind the first pair and enter the second, third and fourth pairs of gills. The ventral aorta runs forward along the mid-line of the floor of the pharynx and close to the hyoid arch bifurcates into a first pair of afferent branchial arteries which goes to the first pair of gills. There is no conus arteriosus.įrom the ventricle arises a stout ventral aorta whose proximal part is dilated to form the non-contractile bulbus arteriosus. These valves prevent the flow of blood in reverse direction. The auricle opens into a thick-walled ventricle by atrio-ventricular aperture guarded by valves. It receives blood from the sinus through a valved sinu-auricular aperture. Auricle lies ventral to the sinus venosus and is a thin-walled single chamber. It receives deoxygenated blood from the entire body by right and left ductus Cuvieri. Sinus venosus is a thin-walled sac placed dorsally over the atrium and ventricle. Heart is 2- chambered, consisting of sinus venosus, atrium and ventricle. Heart is placed in the pericardial coelom ventral to the oesophagus and enclosed within thin-walled pericardium. Haematopoiesis occurs chiefly in teleosts in the kidney intertubular tissue and in the spleen. Besides erythrocytes, nucleated reticulocytes and thrombocytes, as well as coarse and fine granulocytes and various lymphocytes occur. Erythrocytes are elliptical and nucleated with haemoglobin. It consists of the fluid part, plasma and blood corpuscles. Like that of the cartilaginous fishes, blood vascular system consists of a “single circulation.” Blood:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |