MOVEMENTS OF THE BALL 



309 



cavity to a point near the supero-internal angle; here it becomes 

 tendinous, passes through a nbro-cartilaginous ring, and then 

 turns backward and outward to be inserted into the sclerotic 

 between the superior and external recti just behind the center 

 of the globe. The inferior oblique arises just within the orbital 



FIG. 88. Lateral view of the muscles of the eye-ball. 



6, optic net 

 (Landois.) 



5, trochlea or pulley of the superior oblique muscle, 12 ; 6, optic nerve; 8, superior, 

 9, inferior, and 12, external rectus; 13, inferior oblique. 



cavity near the anterior inferior angle, and passes around the 

 anterior part of the globe to be inserted in the sclerotic just below 

 the superior oblique. 



The effect these muscles have upon the movements of the ball 

 is indicated by their origin and attachment. The external and 

 internal recti rotate it outward and inward, the superior and 

 inferior recti upward and downward. The superior and inferior 

 oblique antagonize each other. The former rotates the globe so 



