. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 150 THE NERVOUS SYSTEM. a. External form (Fig-s. 98, 102, 103 ). Fig. II To Hy Lateral view of brain of Jlana escuknfa Mo Ad C Gp lie Choroid plexus. Cereb3lluni. Pineal body. Cerebral hemisphere. Pituitary body. Tuter cinereuni. , ° J > root of olfactory nerve. II Optic nerve. / V Trochlear nerve. L,ol Olfactory lobe. V Trigeminal nerve. ^ Disc at origin of second root. F// Facial nerve. ) Optic lobe. VllI Auditory nerve. Mo Medulla oblongata. /A", A', A'/Glossopharyngeal, pneumo- Tho Tha
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. 150 THE NERVOUS SYSTEM. a. External form (Fig-s. 98, 102, 103 ). Fig. II To Hy Lateral view of brain of Jlana escuknfa Mo Ad C Gp lie Choroid plexus. Cereb3lluni. Pineal body. Cerebral hemisphere. Pituitary body. Tuter cinereuni. , ° J > root of olfactory nerve. II Optic nerve. / V Trochlear nerve. L,ol Olfactory lobe. V Trigeminal nerve. ^ Disc at origin of second root. F// Facial nerve. ) Optic lobe. VllI Auditory nerve. Mo Medulla oblongata. /A", A', A'/Glossopharyngeal, pneumo- Tho Thalamencephalon. , and accessory nerves. To Optic tract. The optic lobes are two promi- nent ovoid bodies placed immedi- ately in front of the cerebellum, and connected with it by the valvula cerebelU ; posteriorly they touch each other in the median plane, while an- teriorly they di- verge and thus constitute the widest part of the brain ; in the angle thus formed is the thalamencephalon. The optic lobes are always more darkly pigmented than any other part of the central nervous system. The Crura cerebri are two columns of white matter, placed beneath the optic lobes, and partly hidden by the pituitary g-land. At their junction with the medulla oblongata, or rather with the pars coiii- mumralis, is a very slight transverse fissure ; at the same point the ventral longitudinal fissure is interrupted by an extremely small grey tubercle (Stieda). /3. Internal structure. From the anterior extremity of the foiu-th ventricle a canal, the Sylvian aqueduct (^Aqueductus S>/lvu, iter a tertio ad quartum ventriculum), may be traced forwards under the cerebellum, in the median line of this section of the brain. At about opposite the middle of the length of the optic lobes the canal is dilated and communicates with the cavities or ventricles [Ventri- culi lobi ojdici, Stieda) enclosed by these ; a general cavity is formed, which in transverse section has something of the form of t
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