THE EYE 



213 



Anteriorly, the chorioid becomes continuous with the Ciliary 

 Body and the Iris. The ciliary body consists of the ciliary 

 muscle and the ciliary processes (Fig. 82). The ciliary 

 muscle lies deep to the anterior part of the sclera and consists 



FIG. 82. Antero-Posterior Median Section through the Eyeball. 



. Upper eyelid. 



b. Lower eyelid. 



c. Fornix conjunctivae. 



d. Fascia bulbi (of Tenon). 

 c. Optic nerve. 



f. Superior rectus muscle. 



g. Inferior rectus muscle. 

 h, Sclera. 



/. Cornea. 



j, Chorioid. 

 k, /. Ciliary body. 



m. Iris. 



n. Spaces of angle of iris 

 (of Fontana). 



o. Retina. 

 /, q. Hyaloid membrane. 



r. Hyaloid canal (of Still- 



ing)- 



s. Vitreous humor. 

 t. Crystalline lens. 

 u. Zonular spaces (canal 



of Petit). 



71. Anterior chamber. 

 x. Posterior chamber. 



of meridional and circular fibres. The meridional fibres arise 

 from the corneo-scleral junction and radiate backwards and 

 inwards to the ciliary processes and the chorioid. When they 

 contract, they draw the chorioid forwards and so relax the 

 suspensory ligament of the lens (see Lens, p. 215). The 

 circular fibres, which form a ring at the margin of the iris, act 



