A narrow, straight tube, running from the pharynx, perforates the diaphragm and joins the stomach in the abdominal cavity. The veins join to form the hepatic portal vein, which ends in the liver through branches. Start studying Rat Respiratory dissection. Starting from the cut give an incision extending up to the snout anteriorly and the genital opening posteriorly. The respiratory system consists of the upper respiratory tract (nasal passages), the airway conduction system (larynx, trachea, bronchi, bronchioles, and terminal bronchioles), and the lower respiratory tract (alveolar ducts and alveoli). The external region of the cockroach’s body is covered with the brown coloured hard exoskeleton, which is composed of chitin. Two muscular chambers, smaller in size and located in front of the ventricles.
Precaval vein is formed by the union of external and internal jugulars and subclavian vein.
The aortic arch arises from the base of the left ventricle. Learn more about the circulatory system of a rat …
The glands are attached to the junction of the bladder and urethra by stalk. This branch of vagus runs backward to the heart through the neck region. Unlike the frog, the rat does not have to hold its breathe or get oxygen from its' skin.
The brain senses the lack of oxygen and sends a signal, making you take a long deep breath, that is, a yawn. It is not a part of the brain. The optic nerves arising from the optic lobes cross each other in front of the infundibulum forming optic chiasma. Origin of right renal is anterior to that of the left one. Now you’ll have the opportunity to see how the respiratory, digestive and circulatory system are arranged spatially. A narrow artery, continuation of the dorsal aorta and extends the whole length of the tail. Immediately after coming out of the cranium the vagus forms a large ganglion, the nodosum ganglion. In the left side it runs through the aortic arch and in the right side it makes a loop around the beginning of the subclavian artery. A small chamber between the mouth cavity and the oesophagus. Rat - Circulatory System. The erythrocytes (R.B.Cs.) Start studying Rat Respiratory dissection. A large pulmonary artery lies between the two atria on the ventral side. Superior (anterior) mesenteric from ileum, caecum and colon.
R. rattus and R. bengalensis are commonly found in godowns domestic houses in towns and cities. Internal iliac runs backward and supplies the pelvic region. The right kidney is slightly anterior to the left. The cardiac stomach is thin walled, transparent and on the left side. Two pairs.
In female the ovaries are ventrolateral to the kidneys.Welcome to BiologyDiscussion! 19.1) are medium-sized ones common in fields, domestic houses and godowns of rural areas. It is enclosed in a two layered capsule.
Dissection Video. You can analyse the circulatory system, respiratory system and digestive system through this dissection. 19.2). Of late, due to prevailing high cost, guinea pig is being replaced by rat. The caudal joins the postcaval at their junction. a. Small, paired, club- shaped, anteriormost outgrowths of the brain. A fairly large, blind outgrowth at the junction of the small and large intestine. A common passage for urine and sperms. The first part of the small intestine and forms a U-shaped loop. The nerves turn forward along the boundary between the oesophagus and trachea, to both of which they send branches and innervate the larynx and the diaphragm. Formerly guinea pig (Cavia sp.) In male, the urethra is long and muscular and passes through the penis to open at its tip. It is a large, median vessel formed by the joining of a number of veins bringing blood from the organs in the posterior and middle region of the body. The two iliacs join to form a common iliac. Rate 5 stars Rate 4 stars Rate 3 stars Rate 2 stars Rate 1 star .
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