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Diagram illustrating the general relationships of the parts of the brain. Labels: A, fore-brain; b, mid-brain; B, cerebellum; C, pons Varolii; D, medulla oblongata; B,c,and D together constitute the hind-brain.

Brain

Diagram illustrating the general relationships of the parts of the brain. Labels: A, fore-brain; b,…

The brain from the left side. Labels: Cb, the cerebral hemispheres forming the main bulk of the fore-brain; Cbl, the cerebellum; Mo, the medulla oblongata; P, the pons Varolii; *, the fissure of Sylvius.

Brain

The brain from the left side. Labels: Cb, the cerebral hemispheres forming the main bulk of the fore-brain;…

Plan in outline of the encephalon, as seen from the right side. The parts are represented as separated from one another somewhat more than natural, so as to show their connections. A, cerebrum; f, g, h, its anterior middle, and posterior lobes; e, fissure of Sylvius; B, cerebellum; C, pons Varolii; D, medulla oblongata; a, peduncles of the cerebellum; C, pons Varolii; D, medulla oblongata; A, peduncles of the cerebrum; b, c, d, superior, middle, and inferior peduncles of the cerebellum.

Outline of the Encephalon

Plan in outline of the encephalon, as seen from the right side. The parts are represented as separated…

Dorsal or posterior view of the medulla, fourth ventricle, and mesencephalon. Labels: p.n., line of the posterior roots of the spinal nerves; p.m.f., posterior median fissure; f.g., funiculus gracilis; cl., its clava; f.c., funiculus cuneatus; f.R., funiculus of Rolando; r.b., restiform body; c.s., calamus scriptorius; l, section of ligula or taenia; part of choroid plexus is seen beneath t; l.r., lateral recess of the ventricle; str., striae acusticae; i.f., inferior fossa; s.f., posterior fossa; between it and the median sulcus is the fasciculus teres; cbl., cut surface of the cerebellar hemisphere; nd., central or gray matter; s.m.v., superior medullary velum; lng., ligula; s.c.p., superior cerebellar peduncle cut longitudinally; cr., combined section of the three cerebellar peduncles; c.q.s., c.q.i., corpora quadrigemina (superior and inferior); fr., fraenulum; f; f., fibers of the fillet seen on the surface of the tegmentum; c, crusti; l.g., lateral groove; c.g.i, corpus geniculum internus; th., posterior part of the thalamus; p., pineal body. The Roman numbers indicate the corresponding cranial nerves.

Medulla

Dorsal or posterior view of the medulla, fourth ventricle, and mesencephalon. Labels: p.n., line of…

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;…

Three stages in the development of the medulla oblongata.

Development of Medulla Oblongata

Three stages in the development of the medulla oblongata.

Section of the medulla oblongata at the pyramidal tracts.

Section of the Medulla Oblongata

Section of the medulla oblongata at the pyramidal tracts.

Section of the medulla oblongata at the lower end of the olives

Section of the Medulla Oblongata

Section of the medulla oblongata at the lower end of the olives

Section of the medulla oblongata at about the middle of the olive.

Section of the Medulla Oblongata

Section of the medulla oblongata at about the middle of the olive.

Ventral or anterior surface of the pons Varolii, and medulla oblongata. Labels: a, anterior pyramids; b, their decussation; c, olivary bodies; d, restiform bodies; e, arciform fibers; f, fibers passing from the anterior column of the cord to the cerebellum; g, anterior column of the spinal cord; h, lateral column; p, pons Varolii; i, its upper fibers; 5, roots of the fifth pair of nerves.

Anterior Surface of the Pons Varolii and Medulla Oblongata

Ventral or anterior surface of the pons Varolii, and medulla oblongata. Labels: a, anterior pyramids;…

Dorsal or posterior surface of the pons Varolii, corpus quadrigemina, and medulla oblongata. The peduncles of the cerebellum are cut shot at the side. Labels: a, the upper pair of corpora quadrigemina; b, the lower; f, superior peduncles of the cerebellum; c, eminence connected with the nucleus of the hypoglossal nerve; e, that of the glosso-pharyngeal nerve; i, that of the vagus nerve; d, restiform bodies; p, posterior pyramids; v, groove in the middle of the fourth ventricle ending below in the calamus scriptorius; 7, roots of the auditory nerve.

Dorsal Surface of the Pons Varolii

Dorsal or posterior surface of the pons Varolii, corpus quadrigemina, and medulla oblongata. The peduncles…

Diagrammatic view from before of the spinal cord and medulla oblongata, including the roots of the spinal and some of the cranial nerves, and on one side of the gangliated chain of the sympathetic. The spinal nerves are enumerated in order on the right side of the figure. Labels: Br, brachial plexus; Cr, anterior crural, O, obturator, and Ss, great sciatic nerves, coming off from lumbo-sacral plexus; x, x, filum terminale; a,b,c, superior, middle, and inferior cervical ganglia of the sympathetic, the last united with the first thoracic, d; d', the eleventh thoracic ganglion; l, the twelfth thoracic (or first lumbar); below ss, the chain of sacral ganglia.

Spinal Cord

Diagrammatic view from before of the spinal cord and medulla oblongata, including the roots of the spinal…