Archive image from page 699 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 NERVOUS SYSTEM. (NERVOUS CENTRES. THE ENCEPHALON.) 686 these bodies in considerable quantity. The pia mater which adheres to their surface abounds in minute bloodvessels, and in sepa- rating it these are seen to penetrate the tuber- cles in vast numbers. This layer of pia mater contributes to form the velum interpositum. The quadrigeminal bodies are the analogues of the optic lobes in birds, reptiles, and fishes. In these classes there is only a single pair of
Archive image from page 699 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 NERVOUS SYSTEM. (NERVOUS CENTRES. THE ENCEPHALON.) 686 these bodies in considerable quantity. The pia mater which adheres to their surface abounds in minute bloodvessels, and in sepa- rating it these are seen to penetrate the tuber- cles in vast numbers. This layer of pia mater contributes to form the velum interpositum. The quadrigeminal bodies are the analogues of the optic lobes in birds, reptiles, and fishes. In these classes there is only a single pair of tubercles. They are of considerable size in birds, and form a conspicuous portion of their encephalon. The division into four takes place only in Mammalia. The anterior are the larger in herbivorous animals, the posterior in the Carnivora. In most quadrupeds these bodies are concealed from view by the posterior lobes of the brain; but in Rodentia they are exposed in consequence of the imperfect developement of the brain in the backward direction. The quadrigeminal bodies rest upon two processes of fibrous matter, which extend backwards to the median lobe of the cere- bellum, and forwards to the optic thalami. These processes form a connection between the thalami and the quadrigeminal bodies and the cerebellum. They have been variously designated processus cerebelli ad testes, proces- sus cerebelli ad corpora quadrigemina, processus cerebelli ad cerebrum. The valve of Vieussens intervenes between these processes, and closes the fourth ventricle at its upper part. A longitudinal groove separates the right and left pair of quadrigeminal bodies. The ante- rior extremity of this groove forms an expanded and somewhat flattened surface on which rests the pineal gland (jig. 386, S). From the pos- terior extremity a small band extends to the valve of Vieussens, called frenum. An inci- sion made vertically downwards along the course of this groove exposes the canal through which the f
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