. Embryology. Embryology; Embryology; genealogy. THE BRAIN AND ITS DERIVATIVES 165. HYPOP OPTIC CHIASMA OPTIC RECESS EPIPHYSIS CHOROID PLEXUS _VELUM TRANSVERSUM LAMINA TERMINALS TQRUS JRANSVERSUS Fig. 97. The five primary divisions of the brain and some of their derivatives. tricks. The nerve fibers from the neuroblasts in the olfactory epithelium grow back into the telencephalon and form the olfactory nerve. The diencephalon is bounded by a line running from the tuberculum posterius to the epiphysis. The ventral wall forms the optic chiasma, where the optic nerves cross as they enter the brai
. Embryology. Embryology; Embryology; genealogy. THE BRAIN AND ITS DERIVATIVES 165. HYPOP OPTIC CHIASMA OPTIC RECESS EPIPHYSIS CHOROID PLEXUS _VELUM TRANSVERSUM LAMINA TERMINALS TQRUS JRANSVERSUS Fig. 97. The five primary divisions of the brain and some of their derivatives. tricks. The nerve fibers from the neuroblasts in the olfactory epithelium grow back into the telencephalon and form the olfactory nerve. The diencephalon is bounded by a line running from the tuberculum posterius to the epiphysis. The ventral wall forms the optic chiasma, where the optic nerves cross as they enter the brain. The developing eye remains attached to the diencephalon by means of the optic stalk. Nerve fibers origi- nating from the neuroblasts in the retina grow back along this stalk and enter the brain. The stalk becomes converted into supporting tissues for the nerves. The ventral wall of the diencephalon forms an evagination which be- comes the nervous component of the pituitary body and is called the infundibulum. The infundibulum fuses with an outgrowth of the ectoderm of the oral cavity. This ectodermal outgrowth is often called the hypophysis, but actually it is only one of the two components of the adult hypophysis. These two components of the adult pituitary body have vastly different functions. The ectodermal element, which forms the anterior lobe of the pituitary, secretes several hormones, such as the gonadotropic and growth. 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 Barth, Lester G. (Lester George), 1905-1979. New York, Dryden Press
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