Pyramid of medulla oblongata

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Brain: Pyramid of medulla oblongata
Medulla oblongata and pons. Anterior surface. (Pyramid visible at center.)
Section of the medulla oblongata at about the middle of the olive. (Pyramid visible at bottom center.)
Latin pyramis medullae oblongatae
Gray's subject #187 768
NeuroNames hier-702
Dorlands/Elsevier p_44/12683083

The interior district 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.

The formatio reticularis of the medulla oblongata, shown by a transverse section passing through the middle of the olive.

Dissection showing the projection fibers of the cerebellum.

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 As such, some of the information contained herein may be outdated.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.

 This neuroscience article is a stub. You can help Wikipedia by expanding it.
v • d • e
Brain: rhombencephalon (hindbrain)
Myelencephalon/medulla

anterior/ventral: Arcuate nucleus of medulla • Pyramid (Decussation) • Olivary body • Inferior olivary nucleus • Anterior median fissure • Ventral respiratory group

posterior/dorsal: VII,IX,X: Solitary/tract • XII, X: Dorsal • IX,X,XI: Ambiguus • IX: Inferior salivatory nucleus • Gracile nucleus/Cuneate nucleus/Accessory cuneate nucleus • Area postrema • Posterior median sulcus • Dorsal respiratory group

raphe/reticular: Sensory decussation • Reticular formation (Gigantocellular nucleus, Parvocellular reticular nucleus, Ventral reticular nucleus, Lateral reticular nucleus, Paramedian reticular nucleus) • Raphe nuclei (Obscurus, Magnus, Pallidus)

tracts: Corticospinal tract (Lateral, Anterior) • Inferior cerebellar peduncle • Olivocerebellar tract • Spinocerebellar (Dorsal, Ventral) • Spinothalamic tract • PCML (Posterior external arcuate fibers, Internal arcuate fibers, Medial lemniscus) • Extrapyramidal (Rubrospinal tract, Vestibulospinal tract, Tectospinal tract)
Metencephalon/pons
Metencephalon/cerebellum Vermis • Flocculus • Arbor vitae • Cerebellar tonsil • Inferior medullary velum

Molecular layer (Stellate cell, Basket cell, Parallel fiber) • Purkinje cell layer (Purkinje cell) • Granule cell layer (Golgi cell) • Mossy fibers • Climbing fiber

Deep cerebellar nuclei (Dentate, Emboliform, Globose, Fastigial)
Fourth ventricle apertures (Median, Lateral) • Rhomboid fossa (Vagal trigone, Hypoglossal trigone, Obex, Sulcus limitans, Facial colliculus, Medial eminence) • Lateral recess
Retrieved from "http://en.wikipedia.org/wiki/Pyramid_of_medulla_oblongata"
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