Contents
Rat Dissection – GCSE/A Level Biology
What is used to dissect a rat?
Use scissors to cut through the abdominal wall of the rat following the incision marks as shown in Figure 1. 2. Cut slowly and carefully
do not cut too deeply to prevent damaging the underlying structures. Keep the tip of your dissection tool pointed upwards.
What are the body parts of a rat?
The rat has short hair, a long naked tail, rounded erect ears, protruding eyes, a pointed snout with long whisker (vibrissae) and five toes on each foot. Albino rats have poor eyesight and depend on facial vibrissae and olfaction for sensory input. Rats have no gall bladder.
How do you skin a rat for dissection?
Skinning Your Rat
Why are rats good for dissection?
The rat’s body structure and organ systems are relatively similar to those of a human. This similarity provides an interesting look into mammalian anatomy and allows students to make comparisons between humans, rats, and other mammals.
How do you remove a brain from a rat?
METHOD
- Decapitate the animal with a pair of sharp, sturdy scissors or a single-edged razor blade.
- Cut through the skin on the top of the head, from the back of the head forward to between the eyes.
- Remove any muscle tissue that may still be attached to the base of the skull.
What is the largest organ in rats anatomy?
stomach/liver). Thin and tough muscle. Its function is to help the lungs fill with air. This is the largest organ in the rats body.
What are the four bones in the hindlimb of a rat?
What are the four bones in the hindlimb of the rat? femur, patella, tibia, and fibula.
What muscle is removed to expose the femur in a rat?
Procedure: Exposing the bones of the leg
Carefully tease away the biceps femoris and gastrocnemius to expose the 3 leg bones: Tibia, Fibula, and Femur and the small patella (kneecap).
Do rats have 5 fingers?
Rat forefeet have four toes and the hindfeet have five toes, both with non-retractable claws. The toes of the forefoot are widely spaced in a circular pattern, while the three central toes of the hindfoot are in a line with the two side toes set slightly back.
Do rats drink blood?
He gave a group of rats access to a large quantity of blood, and found that within 24 hours they had consumed it all, even though it was four times as much “food” as they would normally eat in a day. Richter’s actual, word for word scientific conclusion: ” a real craving for fresh human blood.”
Where do rats for dissection come from?
Where do the animals used in dissection come from? The animals used in dissection may be taken from their natural habitat, or obtained from animal breeders and dealers, ranches, and slaughterhouses – industries notorious for animal cruelty.
How many tissue layers does a rat have?
Rat Aorta Tissue Sections
The wall of the aorta is composed of three tissue layers, the middle of which is thick and elastic.
What are dissecting pins used for?
Dissection pins are used to hold the skin back and improve visibility— they do not hold the specimen to the tray. The specimen may slide during dissection if too much pressure is used.
How can you tell a male from a female rat?
The males have obvious genitalia
the females do not. Look at the underside of your rat under the base of the tail. If you can see furry testicles, you have a boy. If you don’t, she’s a girl.
Do male rats have nipples?
Male rats normally do not have nipples.
What 5 organs are found in the thoracic cavity of a rat?
THORACIC ORGANS
- Trachea.
- Heart (Ventricles)
- Right Lung.
- Diaphragm.
What is the essence of dissecting an animal?
Dissection of animals help us to understand two major branches of biology: Anatomy &
Physiology. Usually dissections are done in colleges and also in high schools of vertebrate organisms which are anatomical or physiologically similar to humans.
How is a brain extracted?
The brain extraction tool is used to remove the skull from an image, leaving only the region occupied by actual brain tissue. It segments these by using the dark space between the skull and brain, occupied by the CSF. This tool comes from the external program FSL’s toolkit (see the FSL webpage).
How do I get rid of mouse brain?
Using a surgical blade, make a cut across on the skull, one along the sagittal suture ( Fig. 1D) and one along the interparietal bone (between the cerebral cortex and cerebellum). c. Use fine scissors to puncture the junction between the olfactory bulb and cortex, not so deep as to avoid damaging the brain (Fig.
How do you remove a spinal cord from a mouse?
Commonly used techniques include using a syringe containing a saline solution to flush the spinal cord out of the vertebral column1 and cutting the entire vertebral column from the animal2. In the latter technique, researchers must decalcify the bone, then trim and process the spinal column with the bones included2.
Why is a gallbladder in a rat missing?
The concentrating power of bile in rat’s liver is high, so the main function of bile concentration by gallbladder is unnecessay in them. This is probably the most supported theory regarding this. Rats frequently take their food so they require a continuous supply of bile. This eliminates the necessity of bile storage.
Why are rats livers so large?
The reason is that rodents have a lobated liver, of which individual lobes can be easily ligated and removed, whereas humans have a non-lobated liver.
How many livers do rats have?
The rat livers had four lobes (left, middle, right, and caudate). The left and middle lobes formed a single lobe but the middle lobe had a deep notch to which the round ligament attached.
What are the 3 bones in the forelimb of the rat?
The forelimb rig linked the left humerus, radius, and ulna together in a kinematic chain (see Fig 2).
What are the three bones in the fore limb of the rat?
The bones in the forelimb of the rat are Humerus, radius ulna.
How many ribs does a rat have?
32. Thoracic cage, formed by 13 thoracic vertebrae, 13 pairs of ribs (7 pairs of true ribs, 6 pairs of false ribs of which 3 pairs are floating ribs) and the sternum.
Which muscle is found in the cheek of the rat?
Masseter muscle
| Masseter | |
|---|---|
| Insertion | Angle and lateral surface of ramus of mandible, coronoid process |
| Artery | masseteric artery |
| Nerve | mandibular nerve (V3) |
| Actions | elevation (as in closing of the mouth) and protrusion of mandible |
What muscle separates the abdominal cavity from the thoracic cavity in a rat?
Locate the diaphragm, which is a thin layer of muscle that separates the thoracic cavity from the abdominal cavity.
What muscles cause a rat’s skin to twitch?
Abstract. The panniculus carnosus is a thin striated muscular layer intimately attached to the skin and fascia of most mammals, where it provides skin twitching and contraction functions.