Step 1: Starter Kit for a Mouse Necropsy
After euthanizing your mouse with carbon dioxide, you must make some observations before beginning dissection.
- Look for exudates from the eyes, mouth, and anal-genital region.
- Check to see whether the mouse has been grooming him/herself properly or whether the fur is clumped and matted.
- Palpate the body to find any lumps or bumps that should be noted and which require precautions when opening the body cavity.
- Note whether the animal is dehydrated (when you pinch the skin, it takes a few seconds to regain its former position) and has lost any weight suddenly.
- If there is anything out of place with the animal, note it on your necropsy sheet for future reference.
The pictures above will help you make geographical descriptions of any lesions you may find. The list of terms may also help you with any descriptions. The locations can be used to describe lesions not only on the animal itself, but on the individual organs and structures as well. When performing a necropsy, keep in mind that the animal's left and right are opposite yours when the ventral side is facing up.
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