. A course of instruction in zootomy (vertebrata). Anatomy, Comparative. 24 ZOOTOMV. 88. Two paired, somewhat kidney-shaped masses, forming the anterior division of the brain, and having their convexi- ties towards the middle line ; they are divided by depressions on their outer sides into two parts, the smaller posterior part answering to cerebral hemispheres, or prosence- phala (Fig. 9, \ the larger anterior part to olfactory lobes, or rhinencephala (olf). 89. The nasal sac (Fig. 4, na), a rounded chamber, opening by a short tubular prolongation in the single nasal aperture. On opening, i
. A course of instruction in zootomy (vertebrata). Anatomy, Comparative. 24 ZOOTOMV. 88. Two paired, somewhat kidney-shaped masses, forming the anterior division of the brain, and having their convexi- ties towards the middle line ; they are divided by depressions on their outer sides into two parts, the smaller posterior part answering to cerebral hemispheres, or prosence- phala (Fig. 9, \ the larger anterior part to olfactory lobes, or rhinencephala (olf). 89. The nasal sac (Fig. 4, na), a rounded chamber, opening by a short tubular prolongation in the single nasal aperture. On opening, it is seen to be lined with strongly pigmented epithelium, and to have its walls much FIG. 9.—Petromyzon marinus. The brain from the dorsal aspect, with the right auditory sac (X 3). , aqueduct of Sylvius : , anterior semicircular canal : cb, cerebellum : , cerebral hemispheres : , medulla oblongata : o. /, optic lobes : olf, olfactory lobes ; , posterior semicircular canal : th, thalamencephalon : v, vestibule : , third ventricle : £, fourth ventricle : I—X, cerebral nerves. 90. The olfactory nerves (Fig. 9, I), passing directly forwards frozn the rhinencephala to the nasal sac, through the apertures in the nasal capsule (§ 6). 91. The optic nerves (Fig. 9, II), springing from the ventral surface of the thalamencephalon and passing directly outwards through the optic foramina (§ 4) to the eyes. 92. The oculomotor (third) nerves (Fig. 9, III), springing from. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897. London, Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectanatomy, bookyear1884
