A narrow artery, continuation of the dorsal aorta and extends the whole length of the tail. 1.143). Small but wide veins not connected with major veins. This cavity remains filled up with jelly-like pulp, blood vessels and nerves. The coiled loops of the ileum are held in position by folds of mesenteries. Immediately after coming out of the cranium the vagus forms a large ganglion, the nodosum ganglion. It is not a part of the brain. The right one arises from the dorsal aorta and the left one is a branch of the left renal artery. It opens to the exterior by vulva, immediately posterior to the urinary opening. c. Left common carotid arises directly from the aortic arch. The secretion of the pancreas is known as pancreatic juice. To expose the brain and roots of the cranial nerves make a hole at the junction of frontals and parietals with a pointed arm bone cutter or preferably a small hand drill. Each lateral lobe bears an irregularly shaped prominence, the flocculus. This branch of vagus runs backward to the heart through the neck region. Cut the sternohyoid muscles along the mid-ventral line and the thyroid gland is exposed. To learn the structure of the digestive system of rat; Theory : The digestive system is composed of the mouth, esophagus, stomach, small intestine, large intestine, rectum and anus and associated glands liver and pancreas. The pyloric stomach is muscular, opaque and on the right side. The food then moves into the small intestine, where the intestine takes in nutrients from the ingested food. The glands are attached to the junction of the bladder and urethra by stalk. 19.1) were used for dissection in most of the undergraduate and postgraduate colleges in Indian Universities. Remove the heart with the pericardium and the lungs. It innervates soft palate and lachrymal gland. Stomach is a highly muscular and glandular sac (Fig. Afterwards, the food goes into the small intestines where most of the digestion occur.The first part of the small intestines has openings or ducts from different secretory organs, such as the gall bladder and the pancreas. b. When Biological Sciences student Amanda Vermette was half-way through her four-year undergraduate program of study at the UM, she was concerned about graduating without a well-thought-out plan. Written by : Miguel. A fairly large pinkish gland in the thorax enclosing the base of the aorta. It is a massive gland located beneath the diaphragm and above the stomach. a. Stop 1: The Mouth. In the abdomen it sends branches to the liver. It is now called anterior ethmoidal nerve, which enters the cranial cavity, runs forward to the nasal cavity after piercing the cribriform plate and sends branches, internal nasals to the mucous membrane. On the other hand, rat digestive system has a fermentation chamber to digest cellulose while human digestive system does not have a fermentation chamber. Moreover, the human digestive system is physically large compared to the systems in rats. The function of each region is different. b. A rectangular left lobe lies dorsal to the quadrate lobe and to the left of the midline. A pair lies on either side of thyroid. Give transverse incisions along the length of the limbs. 1.143). 19.9). The right vagus ends in the posterior surface and the left in the lesser curvature and ventral surface of the stomach. They are suspended with mesovarium. The teeth help in ingesting food. Other than these two differences, there is a difference in size as well since human digestive system is larger than the rat digestive system.1.
It is enclosed in a two layered capsule. The organ-systems of guinea pig are almost similar to those of rats, so far requirements of routine dissection are concerned. The heart is a part of both the venous and arterial systems. The vas deferens arises from the posterior end of the epididymis, passes forward through the inguinal canal and reaches the abdominal cavity. The palate separates the mouth cavity from the nasal passage. The largest and square lobe of the liver has been termed quadrate lobe. A ridge-like structure, narrow anteriorly, extends from the base of the cerebral hemispheres. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. (It is common to both the digestive and respiratory system). The right kidney is slightly anterior to the left one. An oblique groove separates the two ventricles. The Muscular and Skeletal System of the Rat. v. Subscapular supplies upper arm, scapula and thorax. Anteriorly it is dorsal to the larynx. It is divisible into two zones, the duodenum and ileum. As humans are omnivorous, there are a lot of proteins and fats being ingested, and these will have to be digested properly. The first part is colon and the rest rectum. It is a whitish, elongated and irregular-shaped gland located between the limbs of the duodenum. The roof of the buccal cavity is formed by a palate. It is a fairly large opening at the anterior end of the snout and bounded by two lips with corresponding jaws. This helps them ferment the grains and You can read more about this topic since this article only provides basic information.1. Immediately after origin from the vagus the left one runs through the aortic arch and the right one round the subclavian artery. It is believed that it destroys old red blood corpuscles.
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