. A treatise on practical anatomy: for students of anatomy and surgery . ERVES. Twelve pairs of nerves take their origin from thebrain. They are :— 1. Olfactoiy (special sense—smell). - 2. Optic (special sense—sight). - 3. Motor oculi (motion). 4. Pathetic (motion). 5. Trifacial (sensation and motion). 6. Abducens (motion), 7. Facial (motion). 8. AudltoiT (special sense—hearing), 9. Glosso-pharyngeal (special sense and sensation). 10. Pneumogastric (motion and sensation). 11. Spiiial accessory (motion and sensation). 12. H3poglossal (motion). 1. Olfactory Nerve.—Origin, by three roots:(1) midd
. A treatise on practical anatomy: for students of anatomy and surgery . ERVES. Twelve pairs of nerves take their origin from thebrain. They are :— 1. Olfactoiy (special sense—smell). - 2. Optic (special sense—sight). - 3. Motor oculi (motion). 4. Pathetic (motion). 5. Trifacial (sensation and motion). 6. Abducens (motion), 7. Facial (motion). 8. AudltoiT (special sense—hearing), 9. Glosso-pharyngeal (special sense and sensation). 10. Pneumogastric (motion and sensation). 11. Spiiial accessory (motion and sensation). 12. H3poglossal (motion). 1. Olfactory Nerve.—Origin, by three roots:(1) middle lobe of brain; (2) from corpus striatum;(3) from gyrus fornicatus. These three roots unite, form-ing the olfactory tract, which is about one-eighth inch CRANIAL NERVES. 309 wide, one and a half inches long, and terminates in theolfactory bidb, which rests on the cribriform plate of theethmoid. Here it sends off from eighteen to twentyfilaments, which pass through the foramina of the cribri-form plate, and are distributed to the mucous membraneof the Fig. 139.—The Base of Skull, with the Nerves which EscapeFROM ITS Foramina. The cranial nerves are numbered in their customary order. 2. Optic Nerve.—Origin, from the optic chiasm,which is formed by the interlacement of the optic chiasm consists of three sets of fibres: one set pass-ing from the optic tract directly to the optic nerve ofthe same side; another set passing from the optic tractto the opposite optic nerve; the third set being commis-sural between the optic nerves and between the optic 310 PRACTICAL ANATOMY. tracts. The optic nerves pass forward through the opticforamina in the lesser wings of the sphenoid, pierce thesclerotic and choroid, and are distrihuted in the retinae. 3. Motor Oculi Nerve.—Origin, from inner sideof cms cerebri, just in front of pons. Runs along sideof body of sphenoid, passes through the anterior lacer-ated foramen, and is distributed to all the muscles of theo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomy, bookyear1891
