Jit Sin Express

Rat Dissection - What You're Going to See.

As what I had mentioned earlier before, we are going to dissect two rats; one is for practise and another one is the real practical in which you'll be evaluated for the practical paper. I had already went through the photostated paper which have been delivered by Mr. Koay Tian Soo and I dont think the real situation matches exactly the same as what you can see from his notes. Well, I'm not saying that the notes cannot be used, just that I think its better to scan through the photos of rat's anatomy, so that you all can get better picture of what you're going to see when dissecting a rat next week. I have just found a very dependable source from the internet which has part of what we need to know while identifying the rat's anatomy. Below are some very detail photos of rat's anatomy... Let's check it out man!

Before you proceed, its important to know that NOT ALL information provided here can be used. Any misconducts later is not within the Blog Owner's responsibility.

I would like to dividethe rat's anatomy into three parts, which consist of rat abdomen, rat reproductive and excretory and also rat cardiovascular.

Rat Abdomen

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Initial incision into a preserved male rat.

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1. Left uterine horn 2. Kidney 3. Colon with a fecal pellet inside 4. Liver 5. Spleen
6. Right unterine horn



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1. Liver 2. Caecum 3. Small instestine 4. Seminal Vesicle 5. Body wall 6. Stomach
7. Greater omentum 8. Spleen

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1. Stomach - body portion 2. Stomach - pyloris portion 3. Stomach - fundus portion
4. Pyloric sphincter 5. Liver

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1. Spleen 2. Small intestine 3. Pancreas 4. Liver 5. Stomach 6. Blunt probe
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1. Small intestine 2. Caecum 3. Mesentery 4. Small intestine
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1. Tougue 2. Soft palate 3. Hard palate 4. Cheek teeth

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The ear region

1. Ear 2. Parotid gland 3. Skeletal muscle

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Throat region of a dissected, preserved rat

1. Larynx 2.Thyroid 3. Mandibular gland 4. Trachea

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Rat Reproductive and Excretory

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Female abdominal region of a preserved, dissected rat.

1. Uterine horns 2. Urinary bladder 3. Uterine body 4. Colon with a fecal pellet

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Rat's ovary region. The picture was taken through a dissecting scope with approx 20X magnification

1. Ovary 2. Oviducts(Fallopian tubes , uterine tube) 3. Uterine horns (uterus)

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Abdominal region of a female pregnant rat... Pitiful lor..

1. Uterus with embryo visible nearby 2. Caecum 3. Left uterine horn 4. Embryo in left uterine horn

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Closeup on the left side of a female pregnant rat.... T.T

1. Embryo in left uterine horn 2. Oviducts 3. Ovary( greatly enlarged from normal, non-pregnant state)

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Testicle region of a male rat, not mine, k?

1. Scrotum 2. Epididymis 3. Tunica vaginalis (covering the testis) 4. Testis

5. Vas deferens

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Cross section view of a preserved rat's testicles. Photo taken under magnification through dissecting scope.

1. Scrotum 2. Seminiferous tubules inside the testis 3. Tunica vaginalis

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Reproductive region of dissected male rat.

1. Prostate glands 2. Urinary bladder 3. Seminal vesicles 4. Small intestines

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Kidney and adrenal gland area of a dissected rat

1. Adrenal gland 2. Kidney

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Rat Cardiovascular

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Thoracic region of a preserved and dissected rat. Latex was injected into the rat to make vessels more visible.
1. Inner wall of the rib cage 2. Lung 3. Right artrium 4. Right ventricle
5. Thymus gland 6. Left artrium 7. Diaphragm

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Thoracic region of a rat after the thymus gland has been lifted up from its normal position, exposing the arteries underneath.

1. Lung 2. Right artrium 3. Right ventricle 4. Aorta 5.Innominate artery

6. Thymus gland

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Thoracic region of a dissected rat, exposing the thoracic arteries.

1. Lung 2. Right artrium 3. Right ventricle 4. Innominate artery 5. Aorta

6. Pulmonary trunk artery 7.Left common carotid artery 8. Left subclavian artery

9. Remains of left anterior vena cava (removed to expose arteries)

10. Left internal mammary artery 11. Right subclavian artery

12. Right common carotid artery 13. Left axillary artery

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Blood vessels of the abdominal region of a dissected rat.

1. Colon 2. Iliolumbar vein 3. Internal spermatic artery 4. Common iliac artery

5. Posterior mesenteric artery 6. Common lilic artery 7. Internal spermatic artery

8.Iliolumbar artery 9. Iliolumbar vein 10. Posterior vena cava

1.. Abdominal aorta 12. Renal vein 13. Renal artery 14. Kidney

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OMGoodness....... ! Three hours spent!... My longest post ever..

Although this is just a post for reference, I still hope that it can help ya all handling the experiment in a easier way, where you can identify the parts of the rat very quickly.

Quote

Mr.Koay , " Girls, until now there is still no record of girl get fainted when seeing the rat. I dont care. Whether you want to cry, shout, laugh or what, I just want you all to get the rat dissected. Or else you'll have to bring the body home..........

............and lastly, dont be afraid while cutting the rats. You have no choice but to kill it. And the only way you can repay their lives is to score A in Biology STPM."

Special thanks to Marc Perkins and Bryan Yang for their nice photos.

Compiled and edited by N. Mandela & C. Guevara

Good luck mates!( Comments PLEASE!!!!)

C.Guevara