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Friday, January 21, 2011

Fetal Rat Dissection

Class Mammalia
Pregnant Rat Dissection

Mammary glands - produce milk.
Viviparous development - retained within body of female to keep warm.
Nourishment - blood vessels through placenta (allows exchange of nutrients and wastes).


Babies out of the uterus.

Mama rat's eleven babies.

Some info - pregnant, double injected, vacuum packaged -
but  unfortunately not how far along she is!
 Reproduction

 - in the female, the uterus passes to the bladder. Where the horns of the uterus join to the urethra, is the vagina which opens to the exterior through the vaginal opening. On the exterior the anus is anus is ventral to the tail, the vaginal opening is ventral to the anus and the urethral opening is ventral to the vagina. The ovary is found at the anterior end of each uterine horn. The embryos form inside the uterus, along each 'horn'.

- in the male, the testes are located in the scrotum. The epididymis is located around each testis and the vas deferens leads from each testis to the urethra. On either side of the bladder are the prostate glands and seminal vesicles. The urethra goes through the penis, and both the bladder and the testes empty to the outside through the urethra.


Reproductive Organs
Uterus - consists of two tubes (horns), y-shape allows for the growth of multiple embryos.
Ovaries - pea-sized organs.
Oviducts - tightly coilded tubes leading from the ovaries to the horns of the uterus.
Vagina - opens to the exterior through the vaginal opening.
Penis - found in the fur covered prepus (foreskin).
Epididymis - where sperm are stored, highly convoluted tubules.
Vas deferens - carries spern to the urethra.
Testes - where the sperm is produced.

Mama rat's big - she's got babies that were growing inside her.

Many nipples for feeding her many young.

Urethral opening, vaginal opening, anus.

Uterus - each 'bubble' has a fetus inside.

Anterior end of one uterine horn - ovary.

Fetus - out of the embryonic sac.

Nourishment - blood vessels through placenta -
allows exchange of nutrients and wastes.

Horn/y-shaped uterus means room for lots of babies!

A very tiny rat fetus.

Eyes are not developed until after the rat is born.



 

13 comments:

  1. This is sick! Why would anyone want to do something so cruel?! 12 lives gone and for what?! We already know all this information! Why not watch her give birth instead? I bet you wouldn't do this to a dog! Would you like someone to do it to you? I bet if you were pregnant you'd want to live!

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    1. You are a disgrace to science. These are specimen that are prepared specifically for dissection. You have no business being here.

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    2. You are a disgrace to science. These are specimen that are prepared specifically for dissection. You have no business being here.

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    3. Hope you know, they do biopsies on everything! They animals that have died of some sort of cause, or they read raised to be biopsied. Some people even donate to science. So to some people they learn something, and then to other people they don't learn anything, they either thinks it's gross or cruel. This is science, evil things happen in science that's how we learn things.

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  2. Chill out. This is just science, cruel as it is don't pretend you actually do give a damn about this rat. Besides why even look for this stuff if you're just gonna hate?

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    1. This comment has been removed by the author.

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    2. I look it up to fight people like you, by the way I do give a damn about all animals, and you can't act for a second that wasn't gross and cruel she was going to have babies. That's kin of like killing a pregnant woman

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  3. What bothered me was the fact that the person wasn't wearing gloves.

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  4. What bothered me was the fact that the person wasn't wearing gloves.

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  5. I'm hoping the rat had died naturally. I'm all for science but not for the sake of just killing for no reason but to learn something that could have been done in another way. But on another note now, pics like this give you insight to something you would never see otherwise and you realize that we all (mammals) pretty much use the same type of organs even though we are in a different shell and of different sizes.

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    1. It probably wasn't it looks fresh because it would have given birth first don't you think

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