310 



ANIMAL PHYSIOLOGY. 



[LESSON 96. 



by removing the iris from its attachment to the ciliary ligament, 

 when a front view of the processes will be obtained, or by making a 

 transverse section through the globe of the eye, when they may be 

 examined from behind, as in Fig. 439. 



1407. In addition to the figure (slightly enlarged) displaying the 

 arrangement of the full series of ciliary processes, a more highly 

 magnified view of them, with their vessels injected, is given in 

 Fig. 440. 



1408. The vessels derived from the arteria centralis retina, and 



Fio. 439. 



TV,. 440. 



Ciliary processes, human, 

 a. The divided edge of the three tunics, 



sclerotic, choroid, and retina. 

 &. The pupil. 



c. The iris. 



d. The ciliary processes. 



e. The scalloped anterior border of the 



retina. 

 / Choroid. 



Ciliary processes, human. 



distributed to the vascular membrane of the retina, form, when in- 

 jected, an object of great interest; it is shown in Fig. 441. 



1409. In the progress of development of the human organs of 

 vision, during embryo life, the crystalline lens is found embedded 

 between two highly vascular membranes ; the one is the anterior, 

 and the other the posterior ', capsule of the lens. These membranes 

 appear to attain their maximum (greatest) development at a certain 

 given period, from which time the vessels begin to disappear by ab- 

 sorption, and at the time of birth are entirely removed. 



1410. The capillaries of the anterior capsule (Fig. 442) are de- 

 rived from the ciliary arteries, and form a beautiful series of loops 

 divided into four somewhat triangular spaces, which collectively oc- 

 cupy the entire membrane, save the centre. In the process of ab- 

 sorption, the central portion is first removed, in each triangle, and 



