The anatomy of the nervous system, from the standpoint of development and function . Olfactory trad Optic nerve N. II\ Inferior lobeOculomotor nerve N. Ill_ . , , , . , „ „ ., Saccus vasculosus Trigeminal and facial nerves Nn. V, VII Trochlear nerve N. IV Fig. 10.—The brain of the dogfish, Squalus acanthias, lateral view. spoken of as the tectum mesencephali. Within this roof end the fibers whichcome from the retime through the optic nerves. The floor of the cavity is formedby the ventral part of the mesencephalon. This appears like a direct continua-tion of the medulla oblongata, and in the m
The anatomy of the nervous system, from the standpoint of development and function . Olfactory trad Optic nerve N. II\ Inferior lobeOculomotor nerve N. Ill_ . , , , . , „ „ ., Saccus vasculosus Trigeminal and facial nerves Nn. V, VII Trochlear nerve N. IV Fig. 10.—The brain of the dogfish, Squalus acanthias, lateral view. spoken of as the tectum mesencephali. Within this roof end the fibers whichcome from the retime through the optic nerves. The floor of the cavity is formedby the ventral part of the mesencephalon. This appears like a direct continua-tion of the medulla oblongata, and in the mammal bears the designation crura Optic lobeEpiphysis . Mesoceele Cerebellum Cerebral hemisphereOlfactory tract, /\ Olfactory bulb Paraphysis Metacode Tubcrciilum acusticum? Tela chorioidea ventriclerral lobe. Preoptic recess Velum transversum \ Metcnccphalon MyclcncephalonSaccus vasculosus MesencephalonOptic chiasma Third ventricle Fig. 11.—The brain of the dogfish, Squalus acanthias, medial sagittal section. cerebri. Emerging from the roof of the mesencephalon between the cerebellumand optic lobe is the fourth or trochlear nerve, and from the ventral aspect ofthis division of the brain arises the third or oculomotor nerve. The Diencephalon.—The thin roof of the diencephalon, which can easily THE NEURAL Mi:i WD IIS DERIVATIVES be torn away so as to expose the third ventre le I igs. 8, 9), is atta< bed bj itscaudal margin to a ridge containing a pair of knob like thickenings the habe-nular nuclei and a commissure connecting tin- tw (Fig. 11). From a pointjust caudal to the middle of this commissure there projects forward over themembranous roof oi the ventricle a slender tube, the epiphysis cerebri or pinealbody, which comes in contact with the roof of the >kull and ends i
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
