Chap, hi.] 



SIGHT. 



859 



§ 538. Before proceeding it will be desirable to recall to 

 mind the nervous supply of the eyeball, omitting for the pres- 

 ent the nerves governing the six ocular muscles which move 

 the eyeball as a whole. 



The eyeball is supplied, in the first place, by the short ciliary 

 nerves (Fig. 147 s.c.) coming from the ophthalmic or lenticular, 

 or ciliary ganglion (l.c.~) which is connected by means of its 

 three roots, (1) through the so-called ' short root ' with the 

 third nerve (r.b.~), (2) with the cavernous sympathetic plexus 



nr 



OC.m 



sym 



V.o-plh 



Fig. 147. Diagrammatic representation of the nerves governing the pupil. 



II. Optic nerve, l.g. ciliary ganglion, r.b. its short root from ///. oc.m., 

 third or oculo-motor nerve, sym. its sympathetic root. r.l. its long root from V. 

 ophthm. the nasal branch of the ophthalmic division of the fifth nerve, s.c. the 

 short ciliary nerves from the lenticular ganglion. I.e. the long ciliary nerves 

 from the nasal branch of the ophthalmic division of the fifth nerve. 



and so, along the internal carotid artery, with the cervical sym- 

 pathetic nerve QsymS), and (3) through the so-called 'long root' 

 with the nasal branch of the ophthalmic division of the fifth 

 nerve (r.?.). Besides the short ciliary nerves, the eyeball is 

 supplied by the long ciliary nerves (Z.c.) coming direct from 



