Crossing of the Pyramids

The pyramidal chiasm is an anatomical structure in the brain that plays an important role in controlling motor functions. It is located in the pons of the brain and consists of two large nerve fibers called pyramids.

The pyramids are long, thin nerve fibers that run from the spinal cord to the brain. They are part of a pathway that carries signals from the spinal cord to the brain and back. The pyramids are also involved in the control of muscle tone and coordination of movements.

The pyramid intersection is where the pyramids intersect with each other. This occurs at the level of the pons of the brain, where they connect with other nerve fibers and form a decussation. This is where the pyramids cross-connect, allowing them to transmit signals to opposite sides of the brain.

Pyramid intersection functions

The pyramidal intersection plays an important role in regulating muscle tone. When pyramidal fibers are stimulated, they transmit signals to the cerebellum, which is responsible for coordinating movements. This allows the brain to control muscle tone and control body movements.

In addition, the pyramidal decussation is also involved in the regulation of sleep and wakefulness. When the brain is at rest, the pyramidal fibers slow down their activity, which leads to decreased muscle tone and muscle relaxation. When the brain wakes up, the pyramidal fibers are activated, which helps to increase muscle tone and readiness for action.

Disturbances in the functioning of the pyramidal decussation can lead to various diseases, such as paralysis, impaired coordination of movements and sleep disorders. However, research suggests that pyramidal decussation may be useful in improving motor function in patients with spinal cord injuries or neurological diseases.

In conclusion, the pyramidal chiasm is an important element of the nervous system that plays a key role in regulating muscle tone, motor coordination and sleep.

Pyramid decussation (PNA) - (d. pyrami-dum, pna.) - part of the complex hypercardex on the facial surface of the medulla oblongata, on the sides of the lateral pyramidal tracts.

These neurocytes form the cell body of the parietal lobe cortex in the upper and lower white matter, respectively, and are connected to each other by specialized commissural fibers. Thanks to the pyramidal tracts, crosstalk between the anterior and posterior cortices regulates their normal activity. Damage to this part of the brain leads to disturbances in perception, coordination of movements and speech. Its disorders usually appear late as a result of damage or decreased functioning of the posterolateral part of the cerebrum itself.

Pyramid Crossing

*Name of muscles:* pyramidal decussation **M**1 and M2, decussus muscles or decussation pyramidal muscles. *Muscle type:* striated muscle, inner pair of central muscles of the right and left longitudinal hock joints.

The name of the muscle speaks for itself and is based on the division of muscles into sections