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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    Fig. 240. cord by three peduncles or crura, of which the superior one can now be seen. The Superior Peduncle (Fig- 240, 3) (processus a cerebeUo ad testes) is a broad, flattened white band whicli is connected below with the inferior vermiform process and passes forwards to the corpora qnadrigemina, the two pedun- cles of opposite sides converg- ing at the posterior border of the testes. The two processes are prolonged beneath the cor- pora quadrigemina to the optic thalamus, their fibres decussat- ing in their passage. [The cerebellum shonld now be carefully but completely divided in the median line by successive incisions, when the valve of Yieussens will be ex- posed, and the superior pedun- cle can be still better seen]. The Valve of Vieussens (Fig. 239, 13) (Velum medul- lare anterius') is the thin layer of white [rather, gray] nervous matter stretched between the two superior peduncles of the cei'ebellum and connected with the anterior extremity of the inferior vermiform process. It is narrow in front but broader FodRTH Ventricle and Upper Part of Spinal Cord and Membranes. The posterior roots of the nerve are removed on the left side (from Hirschfeld and Leveill^). 1. Corpora quadrigemina. 2. Fillet of the olivary body. 3. Processus a cerehello ad testes. 4. Processus a cerehello ad pontem. 5. Processus a cerebello ad meduUam. 6. Floor of fourth ventricle. 7. Glosso-pharyngeal nerve. S. Pneumogastric nerve. 9. Spinal-accessory nerve. 10. Posterior columns of spina,! cord. 11, 11. Anterior divisions of spinal nerves. 12, 12. Ganglia of nerves. 13, 13. Posterior divisions of spinal nerves. 14, 14. Posterior roots of spinal nerves. 15, Line of origin of posterior roots of left side. 16, 16. Ligamentum denticulatum. 17, 17. Anterior root of spinal nerves. IS. Dura mater.