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

  • Heath, Christopher, 1835-1905.
Date:
1885
Catalogue details

Licence: Public Domain Mark

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

    621/682 (page 529)
    The Inferior Vermiform Process (Fig. 267) is divided into the following portions. Most anteriorly is the Nodule (6), which projects into the fourth ventricle ; posterior to this is the thin ridge called the Uvula (7), from the fact of its lying between the two tonsils; behind this is the Pyramid (9), and posterior to this again are a few trans- verse commissural fibres. By turning aside or cutting away the amygdalae, a layer of white matter will be brought into view, extending from the flocculus on each side to the tip of the nodule. This is the Velum Medullare Posterius (8). [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 Fourth. Ventricle (Fig. 266, 6) is situated at the back of the pons Varolii and the medulla oblongata, those bodies forming its floor. The roof is formed by the valve of Vieussens and the inferior vermi- form process of the cerebellum ; the sides by the two superior peduncles of the cerebellum (processus ad testes) above, and below by Fig. 267.—Under surface of cerebellum, the amygdalae having been removed (from Hirschfeld and Leveille). 1. Medulla oblongata. 6. Nodulus of inferior vermifonn 2. Pons Varolii. process. 3. Choroid plexus of the 4tli ven- 7. Uvula. Fig. 267. 7- ■8 -10 tricle. 4. Flocculus. 5. Biventral lobe of cerebellum. 8. Posterior medullary velum. 9. Pyramid. 10. Slender lobe. 11. Posterior inferior lobe. M M