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nd live many centuries. The wood is usually hard and tough, and provided with conspicuous medullary rays, forming the silver grain.

The medulla oblongata. B. G. Wilder.

Of or pertaining to the medulla oblongata; medullar.

Like an olive. Olivary body (Anat.), an oval prominence on each side of the medulla oblongata; -- called also olive.

the pons Varolii, a prominent band of nervous tissue situated on the ventral side of the medulla oblongata and connected at each side with the hemispheres of the cerebellum; the mesocephalon. See Brain. Pons asinorum. Etym: [L., literally, bridge of asses.] See Asses' bridge, under Ass.

The posterior part of the medulla oblongata. B. G. Wilder.

The anterior part of the medulla oblongata. B. G. Wilder.

epression or groove in the epiblast of the primitive streak. It is not connected with the medullary groove, which appears later and in front of it. -- Primitive plane (Spherical Projection), the plane upon which the projections are made, generally coinciding with some principal circle of the sphere, as the equator or…

lied especially to several ropelike bundles or masses of fibers on the dorsal side of the medulla oblongata.

The substance of the medullary sheath.

plates of cellular tissue which pass from the pith to the bark of an exogenous stem; the medullary rays. In the wood of the oak they are much larger than in that of the beech, maple, pine, cherry, etc. -- Silver grebe (Zoöl.), the red-throated diver. See Illust. under Diver. -- Silver hake (Zoöl.), the American whit…

the unstriped muscles of the arterial system with motor nerves, situated in a part of the medulla oblongata; a center of reflex action by the working of which afferent impulses are changed into efferent, -- vasomotor impulses leading either to dilation or constriction of the blood vessels.