Take out the brain following the technique adopted for Channa punctatus. 2. The left ventricle is larger than the right one. Two muscular chambers, smaller in size and located in front of the ventricles. By shallow depressions the cerebral hemisphere is divided into a lateral temporal lobe, anterior frontal lobe, median parietal lobe and posterior occipital lobe. Internal jugular drains blood from the sternal region. A large cavity in the thoracic and abdominal region bounded by the ventral abdominal wall, lateral body walls and dorsal body wall. The thoracic cavity is divided into three chambers by membranous tissue and accommo­date the following organs: The space between the two pleural cavities in which the pericardial cavity, the oesophagus and blood vessels are lodged. Phylum Chordata Horizontal: relating to the plane separating dorsal and ventral 2. Vaginal orifice. It is an oval body attached to the ventral surface of the brain, just posterior to the crossing of optic nerves. Cut the clavicles and the muscles there. The veins join to form the hepatic portal vein, which ends in the liver through branches. In both humans and rats, the testes located in the scrotum, are the reproductive organs that produce sperm and male hormones (testosterone). Internal carotid lateral in position and enters the skull. Ducts from the lobules unite into a common duct which joins the common bile duct to open in the duodenum. The last part of the large intestine. The reproductive system also supplies nourishment for the offspring after birth and produces female sex hormones. A ridge-like structure, narrow anteriorly, extends from the base of the cerebral hemispheres. 7. Make sure you know each of the highlighted words. The paired testes are a crucial component in this process, as they produce both sperm and androgens, the hormones that support male reproductive physiology. receives the penis during sexual intercourse and is the birth canal for delivering offspring. The tenth or vagus nerve arises from the posteroventral part of the medulla. A transverse commis­sural structure connecting the two cerebral hemispheres. Gastrocnemius - located on lower leg, bulk of the calf muscle. In this laboratory exercise, the anatomy of the rat will be examined in some detail. This quiz will look at comparing and identifying parts of the male reproductive system between rats, fish, and toads. Two large bodies, relatively long and narrow with broad bases and united mesially. C. Mandibular turns downward, runs forward and divides into two branches: a. Nervus spinosus reenters the skull and innervates the dura mater. Cut through the sac carefully to reveal the testis. Body weight, the weights of the testes and accessory sex organs and androgen levels were intrinsically related to basal androgen levels. 19.1) were used for dissection in most of the undergraduate and postgraduate colleges in Indian Universities. A mesial downward process from the floor of the diencephalon. Paired, compact, yellow bodies, ventrolateral to the kidneys in female. It innervates soft palate and lachrymal gland. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. You may recall that in your first-year biology course you dissected a grass frog and a fetal pig. ... Whilst the dissection of the control rat … In female the ovaries are ventrolateral to the kidneys. GROSS ANATOMY The gross anatomy of the male reproductive organs of the rat is described by Greene (1955). Costocervical supplies neck and up­per part of the thoracic wall. Anatomy and Histology of the Human and Mouse Male Urogenital Tract. Dissection of Alimentary System 2. The function of the male reproductive system (Figure 27.2) is to produce sperm and transfer them to the female reproductive tract. 6. Dissection of Neck Region 8. 19.5). On the surface of the testis is a coiled … Posteriorly the cerebral hemispheres cover the thalamencephalon and the optic lobes. 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. BIOL 220. Inferior (posterior) mesenteric from rectum. For a description of the male rat reproductive anatomy see: Male Reproductive System in the Rat Breeding Guide section. Cut through the sac carefully to reveal the testis. Rattus norvegicus (Fig. Disclaimer Copyright, Share Your Knowledge The two iliacs join to form a common iliac. __________________, What muscle covers the ventral, abdominal region? The rat is a typical mammal. Four species of rats are common in India, of which three are wild. Vagina. Lift the skin of the abdomen with a pair of forceps and make a small cut at about the middle of the abdomen. 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. Most of the male reproductive system is located outside of the body. In a way, studying the rat is like studying a human. The nerve divides into nine branches and spread fanwise to the sides of the nose, the upper and lower lips. (Fig. Parameters to be studied include testicular, endocrine and exocrine function, sperm viability and accessory organ function. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. The epididymis is the storage unit of the testes. Dissection and Anatomy of the Female & Male Rat. Keep in mind that dissecting does not mean "to cut up"; in fact, it means, "to expose to view". Rat Dissection: Reproductive system (Physiology) STUDY. The superficial branches pass anteriorly and dorsally over the zygomatic arch and branches in the neck. 19.4). Scissors serve better because the point of the scissors can be pointed upwards to prevent damaging organs underneath. Locate the structures in your own rat and then observe the structures of the opposite sex from another group's rat. The innominate artery is absent on the left side. Privacy Policy3. The fifth or trigeminal is the first nerve of the medulla oblongata. What are antibiotics? Learn vocabulary, terms, and more with flashcards, games, and other study tools. Of late, due to prevailing high cost, guinea pig is being replaced by rat. [ "article:topic", "showtoc:no", "license:ccbyncsa", "authorname:smuskopf" ], https://bio.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FLearning_Objects%2FWorksheets%2FBook%253A_The_Biology_Corner_(Worksheets)%2FAnatomy_Worksheets%2FInvestigation%253A_Rat_Dissection, The classification of the Rat (Rattus norvegicus), The Muscular and Skeletal System of the Rat, The Reproductive Organs of the Female Rat, information contact us at info@libretexts.org, status page at https://status.libretexts.org, pectoral region - area where front legs attach, pelvic region - area where the back legs attach, Note the hairy coat that covers the rat and the sensory hairs (whiskers) located on the rat's face, called, The mouth has a large cleft in the upper lip which exposes large front, The ears are composed of the external part, called the. Internal mammary supplies sternal region. Complex organic chemicals are secreted by certain glands. Kingdom Animalia Put the specimen on its back on a dissecting tray. The excretory and reproductive systems of vertebrates are closely integrated and are usually studied together as the urogenital system. They run backward and open separately on the dorsal surface of the narrow neck of the urinary bladder. Order Rodentia c. Left common carotid arises directly from the aortic arch. Do not damage the underlying structures. In humans, the most important male … Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Cut through the abdominal wall of the rat following the incision marks in the picture. Male reproductive system. Identification of morphologic changes in the whole prostate or in specific lobes that correlate with tissue weight changes can be challenging. ______________, What feature do you find on females, but not males? The goal of this study was to determine the effects of BEP, in doses analogous to those given to humans, on the male reproductive system, spermatozoa, fertility, and progeny outcome in an animal model. Locate these large bean shapedstructures located toward the back of the abdominal cavity on either side ofthe spine. The oviduct is differentiated into two distinct zones: The anterior, narrow, looped region opening in the body cavity through a ciliated funnel, facing the ovary. Copulation in rats … Click here to let us know! A fairly long tube. Triceps brachii - located on the sides and back of the upper arm. Precaval vein is formed by the union of ex­ternal and internal jugulars and subclavian vein. The right kidney is slightly anterior to the left. Cut through the sac carefully to reveal the … The thick walled, dilated por­tion following the fallopian tube: The two uteri join to form a median vagina. The organs lodged in the coelome are collectively termed viscera. What tube connects the kidney to the bladder? The right one arises from the dorsal aorta and the left one is a branch of the left renal artery. Remove the bones taking care that the roots of cranial nerves are not damaged. Examining the reproductive system of the rat, students have the opportunity to compare male and female organs, study internal fertilization, and observe gestational changes in the female. The ninth or glos­sopharyngeal is the fifth nerve of the medulla. Dermal - relating to the skin In female, it opens to the exterior through an aperture, immediately posterior to the clitoris. Right & Left - refers to the specimen's right and left, not yours Renal arteries and veinssupply the kidneys with blood. The veins they are receiving are not exactly similar. Questions and Answers 1. Dissection of Brain 7. Longitudinal - lengthwise THE RAT 1. Lienogastric from stomach, spleen and pancreas. The Excretory and Reproductive System of the Rat Checkpoint—have your teacher initial lab before continuing. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Attaches to heel by the Achilles Tendon. ii. Male Reproductive Organs (refer to diagram below) 1. a. Superficial petrosal runs along the lateral border of the carotid artery and through the middle ear. Attached to the inner border of the testes. Dr. YOUNG C. LIN. Pelvic: relating to the hip region The following organs are lodged in the abdominal cavity: A large, reddish brown gland with four lobes, the right, the left, a median cystic and a posterior caudate. Lateral: toward the sides /Median: near the middle Immediately after origin from the vagus the left one runs through the aortic arch and the right one round the subclavian artery. Cut through the sac carefully to reveal the testis. Frontal traverses the orbit, emerges in the region of the upper eye lid to which it sends branches and then proceeds forward to inner­vate the skin of the forehead. Transverse: relating to the plane separating anterior and posterior The penis is the male organ for sexual intercourse and urination. Deep: some distance below the surface b. Anterior laryngeal from the posterior end innervates larynx and thymus gland. In the neck region it sends two branches. Formerly guinea pig (Cavia sp.) Paired, right and left, arise from one point. Expose the thoracic and abdominal cavity following the procedure adopted for rat. Reproductive organs. Small but wide veins not connected with major veins. 281 Karen . Dissecting tools will be used to open the body cavity of the rat and observe the structures. The right precaval is short and the left one is quite long. Rinse it off with water and place it in your dissecting pan to observe the general characteristics. Pin the muscles listed above on a skinned rat and identify each. Two small, flask-shaped glands at the base of the penis. A pair lies on either side of thyroid. The reproductive organs are shown to be relatively large compared with other organs. In the neck it is placed between the recurrent laryngeal and the cervical sym­pathetic nerve. Male reproductive system. The dorsal aorta pierces the diaphragm and enters the abdominal cavity. In female, they are short. In this simulation, the effects of various treatments on male reproductive function will be investigated. d. Cardiac innervates the heart and great vessels. Epigastric from abdominal muscles and urinogenital system. The scrotum is present in front of the anus, between the hind legs. Vaginal orifice - is the opening into the vagina (part of the reproductive system). In Biology 3A, a much more detailed look at mammalian anatomy will be conducted. Paired, bean-shaped, dark red bodies. Careful … Move your mouse over the rat diagram below to view the organ names. The male reproductive system tissues include testes, epididymides, the various accessory sex glands, ... consistency of gross dissection and are variable. Locate the, The small yellowish glands embedded in the fat atop the kidneys are the, The major reproductive organs of the male rat are the, The lumpy brown glands located to the left and right of the urinary bladder are the, The short gray tube lying dorsal to the urinary bladder is the, At the tips of the uterine horns are small lumpy glands called. You can start at the incision point where the latex was injected and continue toward the tail. Carefully tease away the biceps femoris and gastrocnemius to expose the 3 leg bones: Tibia, Fibula, and Femur and the small patella (kneecap). In the abdomen it sends branches to the liver. Unpaired, sends branches to stom­ach, liver and spleen. Expose the viscera and the neck region following the procedure described previously. ANATOMY & PHYSIOLOGY The two pulmonary veins open in the left atrium through a common opening. Starting from the cut give an incision extending up to the snout anteriorly and the genital opening posteriorly. 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. In male, the urethra is long and muscular and passes through the penis to open at its tip. Note that the joint of the hip is called a ball and socket joint. Terms in this set (21) excretory system. Two small, lobed bodies. The Anatomy Of The Male Reproductive System . It leads to the vas deferens, the tube that brings semen to the urethra. March 21, 2010 at 20:50 (last edited October 12, 2020 at 11:58) Signs of pain in rats due to illness, injury, […] Health Guide Basics Vital Statistics in Rats. Male Sprague-Dawley rats were treated daily with BEP for 3 cycles of 3 weeks each, for a total of 9 weeks. b. Palatine passes backward and upward between the external ear and mastoid process to the auricle and supplies palate and nasal region. TOS4. External iliac supplies abdominal wall and continues as femoral in the hind limb. Fig. The seventh or facial is the third nerve of the medulla oblongata. (you may need to look this up.). ______________________, What muscle covers the ventral, pectoral region? 281 Karen . The optic nerves arising from the optic lobes cross each other in front of the infundibulum forming optic chiasma. Cut through the sac carefully to reveal the testis. Subphylum Vertebrata Dissection of Urinogenital System 9. 1 and fig. Axillary is formed by the union of brachial and subscapular, region and axillary vein. Lab 1. The major reproductive organs of the male rat are the testes (singular: testis) which are located in the scrotal sac. Medical Illustration by Chris McKee for the Rat Guide. Department of Anatomy, Laboratory of Human Reproduction and Reproductive Biology, Harvard Medical School, Boston, Massachusetts . A deep branch supplies the muscles of the lower jaw and lip. A small chamber in which the heart enclosed by a double layered pericardium is lodged. It is a muscular passage, ventral to the rectum but dorsal to the urethra. The renal portal system is absent. The rest of the canal and its associated glands are lodged in the thoracic and abdominal cavities (Fig. Procedure:Remove a single kidney (without damaging the other orga… Share Your PDF File Put it in a high rim petri dish containing water (Fig. On the surface of the testis is a coiled tube called the epididymus, which collects and stores sperm cells. Share Your PPT File. (B) Rodent dissection (rat). It is attached to the posterior face of the diaphragm by falciform ligament. ________________________, What structure is responsible for rat vocalization? site of gamete production and transfer ... what organs are considers to be a part of the excretory (urinary) system… Locate the anus, which is ventral to the base of the tale. For a description of the female rat reproductive anatomy see: Female Reproductive System in the Rat Breeding Guide section. A small, round mass at the posterior junction of the two cerebral hemi­spheres. 1. The structures in the neck region have already been exposed with the removal of the skin. Cut open the scrotum giving a longitudinal incision along the mid-ventral line to expose the scrotal sacs. Dissection of Genital System. The recurrent laryngeals run forward on either sides of the trachea close to it and enter the larynx. d. Chorda tympani enters the tympanic cavity, crosses the tympanic membrane and leaving the cavity innervates the snout, tongue and salivary glands. ______________, What muscle was removed to expose the femur? These external structures are the penis, scrotum, epididymis, and testes. The vagus nerve runs backward through neck and thorax and enters abdomen. Cimetidine was orally administered to male rats at 20, 40 or 120 mg/kg/day for 9 weeks. Start. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The major reproductive organs of the male rat are the testes (singular: testis) which are located in the scrotal sac. 1 and fig. i. Vertebral courses forward and enters cranial cavity. b. The right and left com­mon carotids arise from the innominate artery and the aortic arch respectively and run for­ward through the neck, along the outer sides of the trachea. It opens to the exterior by vulva, immediately posterior to the urinary opening. Anteriorly it lies between the cardiac depressor and the main trunk of the vagus nerve, but just anterior to the aortic arch it is lateral to the vagus nerve. Paired tubes. Near the level of the larynx each carotid divides into two branches, external and internal carotids. HISTORY FINAL (*some of* schoology questions) 7 terms. House rats often carry internal and external parasites. Pressure Points On Female Anatomy 11 photos of the "Pressure Points On Female Anatomy" female dog names, female pleasure points, female pressure points diagram, male pressure points, pressure points on female body, Human Anatomy, female dog names, female pleasure points, female pressure points diagram, male … A few pairs posterior to the renals, supplies dorsal muscles of the lumbar region. It is very large and consists of a central and two lateral lobes, divided by numerous fissures. 19.7). A narrow, straight tube, running from the pharynx, perforates the diaphragm and joins the stomach in the abdominal cavity. 8. In male, these arteries are long and run posteroventrally to supply testes and associated structures lodged in the scrotum (Fig. Related Posts of "Anatomy Of Male Rat" Skull Of Human Anatomy Body. Rat Dissection- Excretory & Reproductive Systems. iv. 19.4 & 19.6). Expose the vessels forming the post­caval vein and hepatic portal system (Fig. It lies on the left side of the abdominal cavity, close to the posterior face of the diaphragm. A muscular partition divides the coelom into a small thoracic cavity in front and a large abdominal cavity behind. These organs do the following jobs within your body: They produce, maintain and transport sperm (the male reproductive cells) and semen (the protective fluid around the sperm). The paired testes are a crucial component in this process, as they produce both sperm and androgens, the hormones that support male reproductive physiology. Flat bodies lying between the prepuce and the skin on either side of the penis. Dr. Ament. In this spe­cies interdependence of the two systems is restricted to the urethra in male only, which acts as a common passage for both urine and sperms.
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