. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. BRAIN 217 recognised even in the adult as a " brow-spot": thus its intracranial portion does not represent the entire A parietal organ appears to be entirely wanting in all Amphibians with the possible exception of some few Anura, in which traces of it have been FIG. 165.—LONGITUDINAL SECTION OF BRAIN OF AN EMBRYO OF Lacerta vivipara ^ 26. (After K. von Kupffer.) ao, olfactory area ; hi, blood-sinus ; bo, olfactory lobe ; c, cerebellar commissures ; ra, anterior commissure ; ch, superior
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. BRAIN 217 recognised even in the adult as a " brow-spot": thus its intracranial portion does not represent the entire A parietal organ appears to be entirely wanting in all Amphibians with the possible exception of some few Anura, in which traces of it have been FIG. 165.—LONGITUDINAL SECTION OF BRAIN OF AN EMBRYO OF Lacerta vivipara ^ 26. (After K. von Kupffer.) ao, olfactory area ; hi, blood-sinus ; bo, olfactory lobe ; c, cerebellar commissures ; ra, anterior commissure ; ch, superior (habenular) commissure ; ck, central canal of spinal cord ; cp, posterior commissure ; cpa,, anterior pallial (hippo- campal) commissure ; cpo, posterior optic commissure ; cpp, posterior pallial commissure ; cs, spinal commissure ; <:n; swelling of optic chiasma ; c1, para- physis ; hm, cerebral hemisphere ; hi/, hypophysis ; in, interorbital septum ; J (and »•) ventricle of infundibulum ; opt, optic chiasma ; , parietal organ ; pi'h, choroid plexus on medulla oblongata ; /?, hind-brain ; ro, optic recess ; si, sulcus intraencephalicus posterior ; tp, tuberculum posterius superius : tr, torus transversus ; vb, ventral flexure of medulla oblongata ; vc, valvula cerebelli ; vp, posterior medullary velum ; vt, velum transversum ; Z, epi- physis. In the Gymnophiona the olfactory lobes and hemispheres are relatively larger than in other Amphibians, and the hemispheres overlap the posterior parts of the brain to a larger extent. The 1 A rounded vascular body arising from the roof of the third ventricle and representing a paraphysis (p. 200) has been mistaken for the epiphysis (Fig. 164, A, ch. plx'). 2 A parietal foramen was, however, present in the Palaeozoic Stegocephali and other extinct Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustratio
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