EXAMLXATIOX OF THE EYEBALL 



847 



placed wide capillaries, called tlie chorio-capillaris. The pigment becuUR-n less in 

 aniDunt as we pass inwards, and tinally ceases, being absent entirely from the 

 chorio-capillaris and vitreous lamina. 



In front of the ora serrata the uveal coat becomes considerably modified, and 

 the i)art reaching from here to the iris may conveniently ])e termed the ciliary region 

 of the tract, or ciliary body. Its superficial aspects have ])een already l»rit'fiv 

 descril)ed. In front, the ciliary processes, about seventy in number. ])roject towards 

 the interior of the eye, forming the corona ciliaris. Behind this i)art lies' the 

 orbiculus ciliaris, whose inner surface is almost smooth, faint radial folds only 

 being present, three or four of which join each ciliary process. The more minute 

 structure of tliis ciliary region resemljles closely that of the choroid, except that 



Fig. 476. — Diagrammatic Horizontal Skctiox of Eyeball and Orbit. 

 (After Fuchs, much modified.) 



Periorbita green; mascle-fascia red; Tenon's capsule yellow. 



Lower lachrymal punctnm 

 Cornea 

 Opening of Meibomian gland 



CARUNCLE 



Inner palpebral ligament 



Anterior chambfr 

 Iris 



NASAL PROCESS OF UPPER JAW 



Anterior limb of inner 

 palpebral ligament 



Lachnniiat sac 



Posterior limb of inner palpe- 

 bral ligament with Horner's 

 muscle springing from it 



LACHRYMAL BONE 



Process of muscle-fascia to under 

 surface of conjunctiva 



Ora serrata 



Tendon of insertion of internal 

 rectus 



Inner check ligament 

 Periorbita 



ORBITAL PLATE OF ETHMOlO BONE 



Posterior lamina of muscle-fascia 

 lined by Tenon's capsule 



Central retinal vessels in 

 optic nerve 



External rectus muscle 



Internal rectus muscle 



OPTIC .SERVE 



the chorio-capillaris is no longer present, that the stroma is thicker and richer in 

 blood-vessels, and that a muscular element (ciliary muscle) exists l>etween the 

 vascular laver and the membrana suprachoroidea. On antcro-i>osterior section the 

 ciliary body is triangular; the shortest side looks ftirward, and from about its mid- 

 dle the iris arises; the two long sides look respectively inwards and outwards, the 

 inner having the ciliary ])rocesses upon it, while the outer is formed by th(^ ciliary 

 muscle. This muscle possesses smooth fibres and consists of an outer and an inner 

 division; in the outer the fibres run longitudinally, inserted into the outer fibrous 

 coat of the eye at the sclero-corneal junction in front, and passing backwards to 

 join the outer lavers of the orbiculus and choroid; the inner contains circularly run- 

 ning fibres situated next to the ciliary i)rocesses. .Tlie entire muscle is destitute of 

 pigment, and therefore is recognisable in the section by its liglit col<jur. The wiiole 



