Pyramid of medulla oblongata
Encyclopedia
The anterior or ventral portion of the medulla oblongata
is named the pyramid and lies between the anterior median fissure
and the antero-lateral sulcus
.
Its upper end is slightly constricted, and between it and the pons
the fibers of the abducent nerve emerge; a little below the pons it becomes enlarged and prominent, and finally tapers into the anterior funiculus
of the medulla spinalis, with which, at first sight, it appears to be directly continuous.
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...
is named the pyramid and lies between the anterior median fissure
Anterior median fissure
Anterior median fissure can refer to:* Anterior median fissure of the spinal cord* Anterior median fissure of the medulla oblongata...
and the antero-lateral sulcus
Antero-lateral sulcus
The Anterolateral sulcus of spinal cord is a landmark on the anterior side of the spinal cord. It denotes the location at which the ventral fibers leave the spinal cord.The anteriolateral sulcus is less visible than the posterolateral sulcus....
.
Its upper end is slightly constricted, and between it and the pons
Pons
The pons is a structure located on the brain stem, named after the Latin word for "bridge" or the 16th-century Italian anatomist and surgeon Costanzo Varolio . It is superior to the medulla oblongata, inferior to the midbrain, and ventral to the cerebellum. In humans and other bipeds this means it...
the fibers of the abducent nerve emerge; a little below the pons it becomes enlarged and prominent, and finally tapers into the anterior funiculus
Anterior funiculus
The most lateral of the bundles of the anterior nerve roots is generally taken as a dividing line that separates the antero-lateral region into two parts, viz., an anterior funiculus, between the anterior median fissure and the most lateral of the anterior nerve roots; and a lateral funiculus,...
of the medulla spinalis, with which, at first sight, it appears to be directly continuous.
See also
- Corticospinal tractCorticospinal tractThe corticospinal or pyramidal tract is a collection of axons that travel between the cerebral cortex of the brain and the spinal cord....
(also known as "pyramidal tract") - Decussation of the pyramidsDecussation of the pyramidsThe two pyramids contain the motor fibers that pass from the brain to the medulla oblongata and medulla spinalis, corticobulbar and corticospinal fibers....