POSTERIOR PYRAMID Meaning and
Definition
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The term "posterior pyramid" refers to a specific anatomical structure found within the brain called the medulla oblongata. The medulla oblongata is situated at the lower part of the brainstem, positioned between the spinal cord and the pons. It serves as a vital junction and plays a crucial role in relaying signals between the brain and the rest of the body.
The posterior pyramid, also known as the pyramidal tract or the corticospinal tract, is a prominent feature within the medulla oblongata. It is responsible for transmitting voluntary motor signals originating from the brain's motor cortex to the spinal cord. More specifically, it carries signals that control precise and skilled movements of muscles in the limbs, such as dexterous hand movements or delicate footwork.
The term "posterior" in posterior pyramid indicates the location of this structure, which is situated towards the back of the medulla oblongata. Its appearance resembles a pair of symmetrical bulges, with one on each side of the medulla. The posterior pyramid consists of nerve fibers, also called axons, that have their origins in the motor cortex of the brain and, upon reaching the medulla oblongata, descend towards the spinal cord.
Damage or lesions to the posterior pyramid can lead to various motor function impairments, such as muscle weakness, loss of coordination, or even paralysis. Consequently, understanding the role and anatomy of the posterior pyramid is crucial in the field of neurology and can help diagnose and treat conditions affecting the corticospinal tract.
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A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for POSTERIOR PYRAMID
Etymology of POSTERIOR PYRAMID
The word "posterior" comes from the Latin word "posterior", meaning "later, following" or "located behind". The word "pyramid" comes from the Latin word "pyramis", which is derived from the Greek word "puramis", meaning "cone" or "pyramid". In anatomy, the term "posterior pyramid" refers to a specific structure within the brain called the medullary pyramid. It is located at the lower part of the brainstem and takes its name from its pyramid-like shape and posterior positioning.
