The nerves within the corticospinal<unk> are involved in movement of muscles of the body. Because of the crossing-over of fibres, muscles are supplied by the side of the brain opposite to that of the muscle. The nerves within the corticobulbar<unk> are involved in movement in muscles of the head. They are involved in swallowing, phonation, and movements of the tongue. By virtue of involvement with the facial nerve, the corticobulbar<unk> is also responsible for transmitting facial expression. With the exception of lower muscles of facial expression, all functions of the corticobulbar<unk> involve inputs from both sides of the brain. The extrapyramidal system refers to<unk>  within the spinal cord involved in involuntary movement but not part of the<unk> . Their functions include the control of posture and muscle tone.
Pyramidal tracts
Anterior corticospinal tract
Frontopontine fibers
Cerebrospinal fibers
Geniculate fibers
Extrapyramidal system
Striatopallidal fibres
Hypothalamotegmental tract