CHAPTER VII. 



Tab. VI. — TROCHLEAR MUSCLE OF THE EYE, AND KIDXBY. 



Fig. 1. The trochlear or superior oblique muscle, arises with the 

 straight muscles from the bottom of the orbit. Its muscular portion, 

 a, is extended over the upper part of the eye-ball, and gradually as- 

 sumes the form of a smooth, round tendon, b, which passes through 

 the pulley, c, and is fixed to the inner edge of the orbit, d, then turn- 

 ing backwards and downwards, e, is inserted into,/, the sclerotic mem- 

 brane. The use of this muscle is to bring the eye forwards, and to 

 turn the pupil downwards and upwards. 



Fig. 2. A section of the human kidney ; a, the einulgent artery, 

 which conveys the blood to, b, the papillcB, where the peculiar fluid 

 is secreted ; from whence it passes by tubes into, c, the pelvis ; d, the 

 emulgent vein which returns the blood ; e, the ureter, or tube which 

 conducts the secretion to its receptacle. 



