Mouse Anatomy
Because the size of a mouse depends upon the species to which it belongs, the anatomical parts of an individual mouse may vary. However, the bodies of most mice include lungs, reproductive organs and kidneys, as well as the spleen, brain, spinal cord, heart, liver, stomach, diaphragm, seminal vesicle, urinary bladder, thorax, small intestine, large intestine and gall bladder.
Due to this generic anatomy, mice are commonly used in laboratory settings as test subjects. Some are even bred specifically for laboratory use. The anatomy of the mouse is similar to that of most mammals, humans included. Their body parts also respond to stimuli in much the same way that human body parts respond. Great advances have been made in science and medicine as a result of mice. In fact, almost all medicines approved for human use have been tested first on lab mice.
Mice have unique Harderian glands in their eyes. When under stress, these glands produce a reddish-brown discharge. This happens most commonly when mice are deprived of food or when wild mice are caged.
Differences Between Rats and Mice