. Chordate anatomy. Chordata; Anatomy, Comparative. 350 CHORDATE ANATOMY Instead of only two brain divisions, cyclostomes have five, telencephalon, diencephalon, mesencephalon, metencephalon, and myelencephalon. Ontogenesis reveals, however, that these five vesicles of cyclostomes and higher vertebrates develop from the original three which are correlated with the three major senses, smell, sight, and hearing. The primitive fore-brain, which in the opinion of most morphologists corresponds to TELEN- MYELENCEPHAUON epiphysis' parietal organ habenular ganglion dorsal sac' paraphysis Monroe's for
. Chordate anatomy. Chordata; Anatomy, Comparative. 350 CHORDATE ANATOMY Instead of only two brain divisions, cyclostomes have five, telencephalon, diencephalon, mesencephalon, metencephalon, and myelencephalon. Ontogenesis reveals, however, that these five vesicles of cyclostomes and higher vertebrates develop from the original three which are correlated with the three major senses, smell, sight, and hearing. The primitive fore-brain, which in the opinion of most morphologists corresponds to TELEN- MYELENCEPHAUON epiphysis' parietal organ habenular ganglion dorsal sac' paraphysis Monroe's foramen HEMISPHEREv OLFACTORY /^ LOBE BASAL ganglion' ANT COMMISSURE CHORIOID PLEXUS' .POST. COMMISSURE /TECTUM OPTICUM SPINAL [GANGLION. POST RECESS INFUNDIBULUM \ HYPOPHYSIS ^OPTIC THALAMUS LATERAL VENTRICLE, BASAL GANGLION HEMISPHEREi OPTIC THALAMUS EPIPHYSIS VENT IE I I /HABENULAR 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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