Major bones on a mouse skeleton include the skull, mandible, scapula, ribs, pelvis, femur, tibia, fibula, radius, ulna, humerus and several vertebrae along the spine. The anatomy of small mice was not fully diagrammed or drawn until 1965 when scientists made detailed drawings of the skeletal, circulatory and endocrine systems of laboratory mice.
The mandible and skull make up the bones of a mouse's head. Teeth, such as two front incisors and several molars, come out of the jaw to aid in chewing and digestion. Bones of the two front legs include the humerus, radius and ulna. Bones of the two hind legs are the tibia, fibula and femur. The pelvis connects the hind legs of mice, whereas the scapula connects the front legs. Ribs and vertebrae protect internal organs.
A mouse's heart can beat up to 632 times per minute compared to an average of 80 times a minute for a human. Mice are often used as laboratory animals for scientific studies because their brains have similar structures to a human brain.
Mice are some of the smallest rodents on Earth. They are good jumpers, and a few specimens can jump 18 inches. Despite their small size, they eat 15 to 20 times per day. Mice live about five months in the wild and up to two years in a lab. They can carry as many as 200 pathogens that make humans sick.