A group of nerve fibres within the pyramid of the medulla oblongata in the brain. It is thought to be vital in controlling movement and speech.
A complex pathway of brain tissue and nerves that controls fine, skilled movements, so called because the nerve tracts look like pyramids under a microscope. The tracts of the pyramidal system begin in the areas of the cerebrum that control movement. They travel down through the cerebrum into the cerebellum, then into the portion of the brain stem known as the medulla oblongata, and finally into the spinal cord. Nerves leaving the spine connect with muscles such as those in the hands and fingers that coordinate precise skills like writing.
A collection of nerve tracts within the pyramid of the medulla oblongata, en route from the cerebral cortex to the spinal cord. Within the pyramid fibers cross from one side of the brain to the opposite of the spinal cord; this is called the decussation of the pyramids.
The direct output from the motor cortices of the cerebral hemispheres to the brainstem and spinal cord. It deals with the regulation of fine muscle movements.