Practical anatomy: a manual of dissections / by Christopher Heath.

  • Christopher Heath
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Practical anatomy: a manual of dissections / by Christopher Heath. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    the flocculus on each side to the tip of the nodule. This is the Velum Medullare Fosterius (8). Fig. 241. Under Surface of Cerebellum, the Amyqdal.'e having been removed (from Hirschfeld and Leveill6). 1. Medulla oblongata [drawn forward]. 2. Pons Varolii. S. Choroid plexus of the 4th ventricle. 4. Flocculus. 5. Biventral lobe of cerebellum. 6. Nodulus of inferior vermiform pro- cess. 7. Uvula. 8. Posterior medullary velum. 9. Pyramid. 10. Slender lobe. 11. Posterior inferior lobe. The brain being again placed with the base downward, an incision is to be made through the valve of Vieussens and the cerebellum, in order to expose fully the cavity of the fourth ventricle. [The cei'e- belluni having been already divided, the iter a tertio ad quartum ventriculum, or aqueduct of Sylvius, remains to be opened. This can be done by making a careful vertical incision in the median line between the corpora quadrigemina and prolonging it through the valve of Vieussens, thus exposing fully the cavity of the fourth ventricle.] The Fourth Ventricle (Fig. 240, 6) is situated at the back of the pons Yarolii and medulla oblongata, those bodies forming its Jioor. The roof is formed by the valve of Vieussens and the inferior vermiform process of the cerebellum; the sides by the two superior peduncles of the cei'ebellum (processus ad testes) above, and below by the restiform body. The cavity of the ventricle is lozenge- shaped, and it communicates above with the third ventricle by the Aqueduct of Sylvius (iter a tertio ad quartum ven- triculum) which passes beneath the corpora quadrigemina