lamprey anatomy diagramshinedown attention attention
(2) The endostyle is replaced by thyroid gland ventral to the pharynx.
The mid-brain or optic lobes extend dorsally from posterior commissure to the cerebellum. Caudal Fin, Cloacal Aperature, External Pharyngeal slits, Eye, Lateral Line System, Naris, Buccal Funnel, Pineal Organ, Urogenital Papilla . The secretion contains anticoagulant which prevents the coagulation of the blood during feeding. The vestibule subdivides by a median fold into an anterior and posterior utricular chambers. 1.7) In adults, the gall bladder is lost and fat stores are laid down in the hepatic tissue. Those teeth present between the circumoral and the marginal. A single median nostril is present on the dorsal side of the head. A single median nostril is present on the dorsal side of the head.
The lamprey has telolecithal eggs having large amount of yolk. The typhlosole takes a slightly spiral course along the intestine and is, hence, known as spiral valve. This makes the head less sensitive, but when the light falls on the tail which is provided by photoreceptors the animal quickly moves.
Histologically, pineal eye is similar to that of paired eyes.
Accommodation is affected by a process found in no other vertebrates. 1.2).
For attachment with the host body they feed the flesh by rasping with the tongue apparatus, suck blood and show sanguivoracity. The outer layer of cells possesses brush border and stores mucus. The gonads extend almost the whole of the body cavity and lack reproductive duct. The side walls of the sinus are pierced by a pair of genital pores which place its cavity in communication with the coelom. The adult functional kidney is mesonephric and is attached to the dorsal wall of the coelom by peritoneal sheet.
The adrenocortical or inter-renal tissue, like the higher vertebrates, develops from coelomic epithelium of posterior end of pronephros. After metamorphosis in lamprey the thyroid gland develops from the endostyle of the ammocoete larva. In addition to this the median and inferior jugular vein collect blood from the muscles of the buccal funnel and gill pouches. The testis consists of many follicles containing male gametes which are liberated into the body cavity. May 4, 2013 - Lamprey anatomical Diagram (lateral view). (Fig. It forms a series of segmental funnels opening into a common archinephric duct.
Its inner wall becomes folded to form numerous gill lamellae while the outer wall is highly thick. 1.3). The intestinal mucosa is also made of single-layered epithelium produced into spiral folds. .
For this reason its circulatory system shows semi-closed character.
These valves regulate the blood pressure in the arteries. The blood of adult lampreys shows a large Bohr effect, particularly in sea lamprey (P. marius) while ammocoete blood has a high affinity for oxygen and weaker Bohr effect. The gill pouches are separated from each other by a septum called interbranchial septum. The sexes are separate in the adult. Median eye or pineal organ is better developed. The medulla leads behind the spinal cord.
The skull is of a primitive type. The gut, kidneys and gonads receive blood supply from special arteries coming out from the unpaired dorsal aorta. (vi) Gills develop into pouches and open into the pharynx. Cloacal Aperature. Internally it is divisible into chambers, which are provided with patches of sensory hairs similar to macula of higher vertebrates.
May 4, 2013 - Lamprey anatomical Diagram (lateral view) Beginning in 2004, a group of scientists from around the globe set out to map the genome of the sea lamprey. Through this aperture passes the naso-hypophysial sac. It prevents shortening of body when myotomes contract. The canals and sacs are filled with endolymph.
1.21). The secretion of buccal glands of the adult play an important role in feeding both by its anticoagulant properties and its cytolytic effects on the skeletal muscles, blood vessels, connective tissue and skin of the living fish.
Such teeth are present on the anterior area of the buccal disc. The vacuum cup is produced inside the oral cavity by the pulling on the tongue backwards by the contraction of the cardio-apicalis muscle. From the coelom the sex cell are carried away through abdominal pores. there are a series of myotomes separated by myocommas. It secretes thyroxin hormone.
1.9). It contains both red blood corpuscles and white blood cells. The heart is an S-shaped structure situated behind the last pair of gill-pouches. The heart is innervated by the vagus branch, they penetrate the heart and profusely innervate the various chambers. The body comprises a cylindrical head and trunk and laterally flattened tail.
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