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Also at the side of each pyramid there is a pronounced bulge known as an olive. Fibers of the posterior column, which transmit sensory and proprioceptive information, are located behind the pyramids on the medulla oblongata. The medullary pyramids contain motor fibers that are known as the corticobulbar and corticospinal tracts. The ...
The pyramidal tracts include both the corticobulbar tract and the corticospinal tract.These are aggregations of efferent nerve fibers from the upper motor neurons that travel from the cerebral cortex and terminate either in the brainstem (corticobulbar) or spinal cord (corticospinal) and are involved in the control of motor functions of the body.
Medullary collecting ducts converge to form a central (papillary) duct near the apex of each renal pyramid. This "papillary duct" exits the renal pyramid at the renal papillae. The renal filtrate it carries drains into a minor calyx as urine. [6] The cells that comprise the duct itself are similar to rest of the collecting system.
The medulla oblongata or simply medulla is a long stem-like structure which makes up the lower part of the brainstem. [1] It is anterior and partially inferior to the cerebellum . It is a cone-shaped neuronal mass responsible for autonomic (involuntary) functions, ranging from vomiting to sneezing . [ 2 ]
Medulla oblongata. Medullary pyramids; Arcuate nucleus; Olivary body. Inferior olivary nucleus; Rostral ventrolateral medulla; Caudal ventrolateral medulla; Solitary nucleus (Nucleus of the solitary tract) Respiratory center-Respiratory groups. Dorsal respiratory group; Ventral respiratory group or Apneustic centre. Pre-Bötzinger complex ...
Between the two pyramids can be seen a decussation of fibers which marks the transition from the medulla to the spinal cord. The medulla is above the decussation and the spinal cord below. From behind The appearance of a cadaveric brainstem from behind, with major parts labelled. The most medial part of the medulla is the posterior median sulcus.
Each olivary body is located on the anterior surface of the medulla lateral to the pyramid, from which it is separated by the antero-lateral sulcus and the fibers of the hypoglossal nerve. Behind ( dorsally ), it is separated from the postero-lateral sulcus by the ventral spinocerebellar fasciculus .
The lateral corticospinal tract is a descending motor pathway that begins in the cerebral cortex, decussates in the pyramids of the lower medulla [1] (also known as the medulla oblongata or the cervicomedullary junction, which is the most posterior division of the brain [2]) and proceeds down the contralateral side of the spinal cord.