Medulla Oblongata

Anterior or dorsal section of the medulla oblongata in the region of the superior pyramidal decussation. a.m.f, anterior median fissure; f.a., superficial arciform fibers emerging from the fissure; py., pyramid, n.ar., nuclei of arciform fibers; f.a., deep arciform becoming superficial; o, lower end of olivary nucleus; n.l., nucleus lateralis; f.r., formatio reticularis; f.a. 2, arciform fibers proceeding from the formatio reicularis; g, substantia gelatinosa of Rolando; a.V., ascending root of fifth nerve; n.c., nucleus cuneatus; n.c.’, external cuneate nucleus; n.g., nucleus gracilis; f.g., funiculus gracilis; p.m.f., posterior median fissure; c., central canal surrounded by gray matter, in which are n. XI., nucleus of the spinal accessory, and n. XII., nucleus of the hypoglossal; s.d., superior pyramidal decussation.

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