The frog: an introduction to anatomy, histology, and embryology . ; G, ganglion of pneumogastric nerve; He, cerebral hemi-sphere ; Lc, optic tract; Lop, optic lobe; M, boundary between medullaoblongata and spinal cord; M 1-10, the spinal nerves; MS, connectionbetween fourth spinal nerve and sympathetic chain; N, nasal sac ; >^^£jgl^PT?^; No, crural nerve ; o, eyeball; S^-timik^-Ql-sympathetic ; S 1-10, theiTmrilt fTinrll Sp> continuation of sympathetic into liEad. I, olfactory nerve; II, optic nerve; III, motor oculi; IV, fourth nerve;V, trigeminal and facial nerves; Va, ophthalmic branc
The frog: an introduction to anatomy, histology, and embryology . ; G, ganglion of pneumogastric nerve; He, cerebral hemi-sphere ; Lc, optic tract; Lop, optic lobe; M, boundary between medullaoblongata and spinal cord; M 1-10, the spinal nerves; MS, connectionbetween fourth spinal nerve and sympathetic chain; N, nasal sac ; >^^£jgl^PT?^; No, crural nerve ; o, eyeball; S^-timik^-Ql-sympathetic ; S 1-10, theiTmrilt fTinrll Sp> continuation of sympathetic into liEad. I, olfactory nerve; II, optic nerve; III, motor oculi; IV, fourth nerve;V, trigeminal and facial nerves; Va, ophthalmic branch of trigeminal;Vc, maxillary branch of trigeminal; Vd, mandibular branch of trigeminal;Ve, hyomandibular branch of facial; Vg, Gasserian ganglion; Vs, upper endof sympathetic trunk, in connection with Gasserian gangUon; VI, abducensnerve; VII, facial nerve; VIII, auditory nerve; X, glossopharyngeal andpneumogastric nerves ; ^ rillTlin -— >• rln^-pharynreal: xl, of glossopharyngeal; X 3-4, branches of pneumogastric. THE NEKVOUS SYSTEM 69. 70 THE NERVOUS SYSTEM OF THE FROG A special set of nerves in connection with the bloodvesselsand viscera forms the sympathetic nervous system. F<yr the dissection of the nervous system specimens should betaken vihich have been in strong spirit for 1/wo or three days, amdin wMch the brain has been exposed to the action of the spirit byremoval of the roof of the skull. A. The Central Nervous System. This is divisible into an anterior portion—the brain—lyingin the cavity of the cranium; aaid a posterior portion—^thespinal cord—which lies in the neural canal of the vertebralcolumn. There is no sharp line of demarcation between thetwo portions, which are directly continuous with each other. If the brain and spinal cord have not already been exposed,clear away the dorsal m,uscles from, both,sides of the spine : cutthrough the occipito-atla/ntal mxmhra/ne, flexing the frogs headsUghUy to make the membrane tense, and
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1896
