. Human embryology and morphology. Embryology, Human; Morphology. THE BEAIN AND SPINAL COKD. 205 The Lamina Cinerea or lamina terminalis (Fig. 167) represents the anterior end of the neural tube. In the adult it stretches between the optic chiasma, which is developed on the floor of the 3rd ventricle and the rostrum of the corpus callosum. Its development will be described later, but it retains with little alteration its early simple structure. The inter-peduncular space, which forms the floor of the 3rd ventricle, also retains in the adult to a considerable extent the simple embryonic form. I
. Human embryology and morphology. Embryology, Human; Morphology. THE BEAIN AND SPINAL COKD. 205 The Lamina Cinerea or lamina terminalis (Fig. 167) represents the anterior end of the neural tube. In the adult it stretches between the optic chiasma, which is developed on the floor of the 3rd ventricle and the rostrum of the corpus callosum. Its development will be described later, but it retains with little alteration its early simple structure. The inter-peduncular space, which forms the floor of the 3rd ventricle, also retains in the adult to a considerable extent the simple embryonic form. In it are developed the corpora albicantia and posterior perforated space. The Optic Thalami are formed in the lateral walls of the fore- brain (thalamencephalon) and in the adult occupy the whole extent of this wall. At first they are completely exposed on the outer aspect of the brain (see Fig. 154), but after the cerebral vesicles grow out from the antero-lateral angles of the fore-brain (3rd ventricle) they are prolonged backwards and downwards over the optic thalami and thus bury them (Figs. 173, 174, and 175). As may be seen from Fig. 169, the optic thalami, with the internal long, , , corp. callosum Island of Reil. claustrum. deso. horn uelum interposition caudate nuc. int. cap. 'choroid pfex\ 3rd uent. thai. uent chiasma Fig 169 —Diagrammatic Section across the 3rd Ventricle of the Adult to show the ' Structures formed ill its Walls. capsule, are simply the enlarged upward continuations of the tegmentum and crusta of the crura cerebri or mid-brain. From Fig. 167, it will be seen that the optic thalamus is an upward. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Keith, Arthur, Sir, 1866-1955. London : E. Arnold
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