. Quain's elements of anatomy . THE MEDULLA OBLOITGATA. EXTERNAL CHAEACTERS. The medulla oblongata is continuous below with the spinal cord, on alevel with the lower margin of the foramen magnum. Its upper limit is THE MEDULLA OBLONGATA. 281 marked by the lower border of the pons Varolii, into which it is con-tinued above ; its anterior or ventral surface rests in the basilar groove,whilst posteriorly it is received into the fossa named the vallecula between Fiff. Pig. 258.—Right half of the brain divided by a tertioal antero-posteriorSECTION (from Tarious sources and from nature). (Alle
. Quain's elements of anatomy . THE MEDULLA OBLOITGATA. EXTERNAL CHAEACTERS. The medulla oblongata is continuous below with the spinal cord, on alevel with the lower margin of the foramen magnum. Its upper limit is THE MEDULLA OBLONGATA. 281 marked by the lower border of the pons Varolii, into which it is con-tinued above ; its anterior or ventral surface rests in the basilar groove,whilst posteriorly it is received into the fossa named the vallecula between Fiff. Pig. 258.—Right half of the brain divided by a tertioal antero-posteriorSECTION (from Tarious sources and from nature). (Allen Tliomsun). | 1, 2, 3, 3a, 3&, are placed on conTolutions of the cerebrum ; 4, tlie fifth ventricle, andabove it the divided corpus callosum ; 5, the third ventricle ; 5, pituitary body; 6,corpora quadrigemina and i^ineal gland ; +, the fourth ventricle ; 7, pons Varolii; 8,medulla oblongata ; 9, cerebellum ; i, the olfactory bulb ; ii, the right optic nerve ; iii,right third nerve. the hemispheres of the cerebellum, and there bounds the fourth its sides the seventh to the twelfth cranial nerves issue. The term medulla oblongata, as employed by Willis and Vieussens, and by ttose■who directly followed them, included the crui-a cerebri and pons Varolii, as wellas that part to which by Haller first, and by most subsequent writers, this teiinhas been restricted. It has the form of an irregular truncated cone, being expanded at itsupper part b
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