. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OPTIC NERVES. Fig. 427. optic nerve; but the more obvious effect of this organization is to increase the surface of the nervous material. A similar contrivance is at times resorted to in the nervous centres, as is exemplified in the cerebral hemispheres; these masses in the higher and more intelligent animals being covered with large convolutions and deep sulci, while in the lower classes they are smooth and consequently possess a super- ficies of limited extent. Optic nerve in that form of monstrosity known by the varie
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. OPTIC NERVES. Fig. 427. optic nerve; but the more obvious effect of this organization is to increase the surface of the nervous material. A similar contrivance is at times resorted to in the nervous centres, as is exemplified in the cerebral hemispheres; these masses in the higher and more intelligent animals being covered with large convolutions and deep sulci, while in the lower classes they are smooth and consequently possess a super- ficies of limited extent. Optic nerve in that form of monstrosity known by the varied appellations of " Cyclops," " Fa'tits a trompe" " Monops" " Kinence- phale," eye. Sfc. The abnormal anatomy of the optic nerve is not in strictness comprised within the scope of the present article, but nevertheless a brief description of the above malformation will pro- bably not be considered out of place. A single eye placed in the middle line of the forehead, and in general a trunk or proboscis growing immediately above this solitary organ of vision, constitute the most striking apparent anomalies in monsters of this class. The writer is indebted to Dr. Johnson, Master of the Dublin Lying-in Hospital, for permis- sion to dissect a specimen of this species of monstrosity in the human subject, and he has obtained through the kindness of Dr. William Wilson Campbell, (formerly assistant in the same establishment,) the particulars of another similar case exa- mined by that gentleman in the year!834. Theannexed wood-cut (Jig. 427) gives a faithful representation of the optic nerve in the prepara- tions dissected by the writer and Dr. Campbell; and it agrees exactly with the ap- pearances fou nd by Geoffrey Saint-Hilaire, in the cases which fell under his obser- vation. The tractus optici present a very natural ap- pearance, being two in num- ber, and perfectly normal in their cerebral attachments, Q t-t course, and relations, &c. man
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