The joint between the thigh and the lower leg in humans and many animals, allowing the leg to bend and straighten; also the corresponding part on the ...
A tissue in a plant or animal composed of fibers that can contract to produce movement or maintain posture; (in animals) any of the contractile organs...
Either of the bony structures forming the upper and lower parts of the mouth, containing the teeth and enabling biting and chewing (the upper jaw = ma...
The passage at the back of the mouth and nasal cavity that leads to the esophagus and windpipe; the front part of the neck containing the pharynx and ...