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Simplified drawing of brain as seen in mesial section, showing relation of brain stem, cerebrum and cerebellum, and ventricular spaces.

Brain in Mesial Section

Simplified drawing of brain as seen in mesial section, showing relation of brain stem, cerebrum and…

Simplified drawing of brain as seen from below, showing relations of brain stem to spinal cord and cerebrum.

Relation of Brain Stem to Spinal Cord

Simplified drawing of brain as seen from below, showing relations of brain stem to spinal cord and cerebrum.

Sagittal section of brain stem; plane of section is somewhat lateral to midline.

Sagittal Section of Brain Stem

Sagittal section of brain stem; plane of section is somewhat lateral to midline.

The base of brain. Labels: 1. Olfactory Bulb; 2. Second, or Optic Nerves; 3. Anterior Perforated Space; 4. Optic Tract; 5. Crus Cerebri; 6. 3rd Nerve; 7. 4th Nerve.; 8. 5th Nerve; 9. 6th Nerve; 10. Pyramid; 11. Olivary Body; 12. Vertebral Artery; 13. Anterior Spinal Artery; 14. Anterior Cerebral Artery; 15. Lamina Cinerea; 16. Middle Cerebral Artery; 17. Tuber Cinereum; 18. Corpora Albicantia; 19. Posterior Perforated Space; 20. Posterior Cerebral Artery; 21. Superior Cerebral Artery; 22. Pons Varolii; 23. Inferior Cerebellar Artery; 24. 7th and 8th Nerves; 25. 9th, 10th, and 11th Nerves; 26. 12th Nerve; 27. Cerebellum.

Base of the Brain

The base of brain. Labels: 1. Olfactory Bulb; 2. Second, or Optic Nerves; 3. Anterior Perforated Space;…

The medulla oblongata (brain stem).

The Medulla Oblongata

The medulla oblongata (brain stem).

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.

Medulla Oblongata

Anterior or dorsal section of the medulla oblongata in the region of the superior pyramidal decussation.…

Section of the medulla oblongata at about the middle of the olivary body. f.l.a., anterior median fissure; n.ar., nucleus arciformis; p., pyramid; XII., bundle of hypoglossal nerve emerging from the surface; at b, it is seen coursing between the pyramid and the olivary nucleus, o.; f.a.e., external arciform fibers; n.l., nucleus lateralis; a., arciform fibers passing towards restiform body, partly through the substantia gelatinosa, g., partly superficial to the ascending root of the fifth nerve, a.V.; X., bundle of vagus root emerging; f.r., formatio reticularis; c.r., corpus restiform, beginning to be formed, chiefly by arciform fibers, superficial and deep; n.c., nucleus of the funiculus teres; n.am., nucleus ambiguus; r., raphe; A., continuation of the anterior column of cord; o', o", accessory olivary nucleus; p.o., pedunculus olivae.

Medulla Oblongata

Section of the medulla oblongata at about the middle of the olivary body. f.l.a., anterior median fissure;…