The two pyramids contain the motor fibers which pass from the brain to the medulla oblongata and medulla spinalis, corticobulbar and corticospinal fibers. Image File history File links Download high resolution version (533x800, 169 KB) Summary Licensing File links The following pages link to this file: Wikipedia:Grays Anatomy images with missing articles 14 Corticospinal tract List of images in Grays Anatomy: IX. Neurology ... Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Elseviers logo. ... The anterior district of the medulla oblongata is named the pyramid and lies between the anterior median fissure and the antero-lateral sulcus. ... In animals, the brain, or encephalon (Greek for in the head), is the control center of the central nervous system. ... The medulla oblongata is the lower portion of the brainstem. ... The spinal cord is a part of the vertebrate nervous system that is enclosed in and protected by the vertebral column (it passes through the spinal canal). ...

When these pyramidal fibers are traced downward it is found that some two-thirds or more of them leave the pyramids in successive bundles, and decussate in the anterior median fissure, forming what is termed the pyramidal decussation. Anterior median fissure can refer to: Anterior median fissure of the spinal cord Anterior median fissure of the medulla oblongata Category: ...

Having crossed the middle line, they pass down in the posterior part of the lateral funiculus as the lateral cerebrospinal fasciculus.

Additional images

Diagrams of the medulla spinalis.	Medulla oblongata and pons. Anterior surface. Image File history File links Gray679. ...	Decussation of pyramids. Scheme showing passage of various fasciculi from medulla spinalis to medulla oblongata.	Section of the medulla oblongata through the lower part of the decussation of the pyramids The medulla oblongata is the lower portion of the brainstem. ...
Section of the medulla oblongata at the level of the decussation of the pyramids. Image File history File links Gray688. ...	Superficial dissection of brain-stem. Ventral view. Image File history File links Download high-resolution version (550x735, 64 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Abducens nerve Facial nerve Pons Vestibulocochlear nerve Caudate nucleus Cerebral peduncle Internal capsule Wikipedia:Grays Anatomy images...	The motor tract.

External links

• Dictionary at eMedicine pyramidal+decussation
• Anatomy Atlases - Microscopic Anatomy, plate 17.326 - "Medula Oblongata"

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. eMedicine is an online clinical medical knowledge base that was founded in 1996. ... The public domain comprises the body of all creative works and other knowledge—writing, artwork, music, science, inventions, and others—in which no person or organization has any proprietary interest. ... An illustration from the 1918 edition Henry Grays Anatomy of the Human Body, commonly known as Grays Anatomy after Henry Gray, is an anatomy textbook widely regarded as a classic work on human anatomy. ...