The motor system is the part of the central nervous system

Central nervous system

The central nervous system is the part of the nervous system that integrates the information that it receives from, and coordinates the activity of, all parts of the bodies of bilaterian animals—that is, all multicellular animals except sponges and radially symmetric animals such as jellyfish...

 that is involved with movement. It consists of the pyramidal

Corticospinal tract

The corticospinal or pyramidal tract is a collection of axons that travel between the cerebral cortex of the brain and the spinal cord....

 and extrapyramidal system

Extrapyramidal system

In human anatomy, the extrapyramidal system is a neural network located in the brain that is part of the motor system involved in the coordination of movement. The system is called "extrapyramidal" to distinguish it from the tracts of the motor cortex that reach their targets by traveling through...

.
The motor pathway also called pyramidal tract or the corticospinal tract start in the motor center of the cerebral cortex

Cerebral cortex

The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different...

. There are upper and lower motor neuron

Neuron

A neuron is an electrically excitable cell that processes and transmits information by electrical and chemical signaling. Chemical signaling occurs via synapses, specialized connections with other cells. Neurons connect to each other to form networks. Neurons are the core components of the nervous...

s in the corticospinal tract. The motor impulses originates in the Giant pyramidal cells or Betz

Betz

Betz, now part of GE Infrastructure is a water treatment company based in Trevose, PA, in Bensalem Township. Betz's core business involves the sale of water treatment chemicals designed to lengthen the lifespan of cooling towers, chillers, boilers, and other water dependent...

 cells of the motor area i.e. precentral gyrus of cerebral cortex. These are the upper motor neurons (UMN) of the corticospinal tract. The axon

Axon

An axon is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma....

s of these cells pass in the depth of the cerebral cortex to the Corona radiata

Corona radiata

In neuroanatomy, the corona radiata is a white matter sheet that continues caudally as the internal capsule and rostrally as the centrum semiovale. This sheet of axons contains both descending and ascending axons that carry nearly all of the neural traffic from and to the cerebral cortex...

 and then to the Internal Capsule passing through the posterior branch of internal capsule and continue to descend in the Midbrain and the Medulla Oblongata

Medulla oblongata

The medulla oblongata is the lower half of the brainstem. In discussions of neurology and similar contexts where no ambiguity will result, it is often referred to as simply the medulla...

. In the lower part of Medulla oblongata 80 to 85% of these fibers decussate (pass to the opposite side) and descend in the White matter

White matter

White matter is one of the two components of the central nervous system and consists mostly of myelinated axons. White matter tissue of the freshly cut brain appears pinkish white to the naked eye because myelin is composed largely of lipid tissue veined with capillaries. Its white color is due to...

 of the Lateral funiculus

Funiculus

The cerebrospinal fibers consist of numerous nerve fibers collected together and enclosed in membranous sheaths. A small bundle of fibers, enclosed in a tubular sheath, is called a funiculus; if the nerve is of small size, it may consist only of a single funiculus; but if large, the funiculi are...

 of the spinal cord

Spinal cord

The spinal cord is a long, thin, tubular bundle of nervous tissue and support cells that extends from the brain . The brain and spinal cord together make up the central nervous system...

 on the opposite side. The remaining 15 to 20% pass to the same side. Fibers for the extremities (limb

Limb (anatomy)

A limb is a jointed, or prehensile , appendage of the human or other animal body....

s) pass 100% to the opposite side.
The fibers of the corticospinal tract terminate at different levels in the Anterior horn of the Grey matter

Grey matter

Grey matter is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil , glial cells and capillaries. Grey matter contains neural cell bodies, in contrast to white matter, which does not and mostly contains myelinated axon tracts...

 of the spinal cord. Here the Lower Motor Neurons (LMN) of the corticospinal cord are located.
Peripheral motor nerve

Nerve

A peripheral nerve, or simply nerve, is an enclosed, cable-like bundle of peripheral axons . A nerve provides a common pathway for the electrochemical nerve impulses that are transmitted along each of the axons. Nerves are found only in the peripheral nervous system...

s carry the motor impulses from the anterior horn to the voluntary muscle

Muscle

Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...

s.