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On the other hand, the optic thalami, which lie between the latter, belong to the second division, which develops from the "intermediate brain "; to the same section belong the single third cerebral ventricle and the structures that are known as the corpora geniculata, the infundibulum, and the pineal gland.
In the brain of man and many of the lower vertebrates, hanging by two peduncles, or strands of nerve fibre, from the thalami, or beds of the optic nerve, is a small rounded or heart-shaped body of about the size of a pea, known as the pineal gland.
From here a narrow duct, called "the aqueduct of Sylvius," passes through the corpus quadrigeminum to the third cerebral ventricle, which lies between the two optic thalami; and this in turn is connected with the pairs of lateral ventricles which lie to the right and left in the large hemispheres. Thus all the cavities of the central marrow are directly interconnected.
There are other forms of agency, such as the zinc disc with the copper centre as used by Braid to induce the hypnotic sleep, but these appear to depend upon tiring the optic nerves and thus, through their action upon the thalami to produce temporary inhibition of the whole basilar tract of the brain.
And what gentle flame soever may warm the heart of modest and wellborn virgins, yet are they fain to be forced from about their mothers' necks to be put to bed to their husbands, whatever this boon companion is pleased to say: "Estne novis nuptis odio Venus? anne parentum Frustrantur falsis gaudia lachrymulis, Ubertim thalami quasi intra limina fundunt? Non, ita me divi, vera gemunt, juverint."
One of these, a double mass, occupies a central position between the hemispheres, and is called the optic thalami. The other two occupy front central positions at the base of either hemisphere, and are known as the corpora striata, or the striate bodies. *The Midbrain* is a short, rounded, and compact body that lies immediately beneath the cerebrum, and connects it with the hindbrain.
The technical names of the more important of these organs are these: the "corpora striata," or striped bodies, of which there are two, the "optic thalami," also two in number, and the "cerebellum" or little brain, situated behind. These make up what is called the "second level" in the system. They seem to be especially concerned with the life of sensation.
The hæmorrhages from anemia are, on the other hand, so frequent, as to explain the majority of such cases as Dr. Clarke's. Meadows observes: "It is not the ovary which is an appendix to the uterus, but the uterus which is an appendix to the ovary." Corpora quadrigemina. Corpora striata. Thalami optici and corpora striata.
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