. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Olfactory Capsule Prechordalium Optic Capsule -Parachordalium —Otic Capsule — Notochord Fig. 471. Diagram of the underpinning stage of skull development seen from the ventral side. The brain now rests upon the prechordalia and parachordalia, while each pair of sense organs is supported by cap- sules. (After Wilder.). r Olfactory Sac —1— Olfactory Capsul --Optic Capsule — Hypophyseal Fenestra h Notochord Fig. 472. Diagram of the fusion stage of skull develo
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Olfactory Capsule Prechordalium Optic Capsule -Parachordalium —Otic Capsule — Notochord Fig. 471. Diagram of the underpinning stage of skull development seen from the ventral side. The brain now rests upon the prechordalia and parachordalia, while each pair of sense organs is supported by cap- sules. (After Wilder.). r Olfactory Sac —1— Olfactory Capsul --Optic Capsule — Hypophyseal Fenestra h Notochord Fig. 472. Diagram of the fusion stage of skull development, seen from the ventral side. The prechordals and parachordals have fused together into a continuous plat- form involving the cartilaginous supports of the nose and ears and the end of the notochord. The eyeball capsules remain in- dependent as parts of the sclerotic layers of the eyeballs, thus making possible the movements of the eyes within the orbits. (After Wilder.) Lastly, the capsules of the olfactory pits fuse solidly on their posterior and inner surfaces with the skull itself, although perforated by the brushlikc olfactory nerves from behind. On their outer surfaces they remain open like cups for the reception of odorous gases, since these chemical stimuli, in order to produce a reaction, must come into direct contact with the nerve endings within the cups. In the center of the platform there is at first an opening, the hypophyseal fenestra, around the developing pituitary body. Later the cartilage grows. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
Size: 1124px × 2222px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
