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(Index , Outline )
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
Part of
Components
Artery
Vein
BrainInfo/UW
hier-702
MeSH
[1]
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.
See also [ ]
Additional images [ ]
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.
Human brainstem anterior view
External links [ ]
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 As such, some of the information contained herein may be outdated.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.
Brain : rhombencephalon (hindbrain)
Metencephalon /pons
surface: Locus ceruleus
Trigeminal lemniscus (Dorsal trigeminal tract , Ventral trigeminal tract )
cranial nuclei : GSA : Principal V /Spinal V - VIII-c (Dorsal , Anterior )/VIII-v (Lateral , Superior , Medial , Inferior ) - SVE : Motor V - VII - GSE : VI - GVE : VII: Superior salivary nucleus
MLF, III, IV and VI (vestibulo-oculomotor fibers , medial vestibulospinal tract )
sensory/ascending: Trapezoid body/VIII - Superior olivary nucleus
Inferior cerebellar peduncle (Vestibulocerebellar tract )
motor/descending: Apneustic center • Pneumotaxic center (Medial parabrachial nucleus ) - Lateral parabrachial nucleus
Middle cerebellar peduncles (Pontocerebellar fibers ) - Pontine nuclei motor/descending: Corticospinal tract - Corticobulbar tract - Corticopontine fibers
Raphe/reticular
Reticular formation (Caudal , Oral , Tegmental , Paramedian ) • Raphe nuclei (Median )
Myelencephalon /medulla
Dorsal
surface: Posterior median sulcus - Postero-lateral sulcus - Area postrema
cranial nuclei : GVA : VII,IX,X: Solitary /tract • SVA : Gustatory nucleus • GSE : XII • GVE : IX,X,XI: Ambiguus • SVE : X: Dorsal • IX: Inferior salivatory nucleus - MLF, III, IV and VI
sensory/ascending: Gracile nucleus • Cuneate nucleus (Accessory cuneate nucleus ) • Sensory decussation • Medial lemniscus
motor/descending: Dorsal respiratory group
Ventral
motor/descending: Ventral respiratory group - Pyramid (Motor decussation ) - Inferior olivary nucleus (Olivocerebellar tract , Rubro-olivary tract )surface: Anterior median fissure - Antero-lateral sulcus - Arcuate nucleus of medulla - Olivary body
Raphe/reticular
Reticular formation (Gigantocellular , Parvocellular , Ventral , Lateral , Paramedian ) • Raphe nuclei (Obscurus , Magnus , Pallidus )
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