MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 



29 



with that of the superior obUque tendon. This condition was already 

 described by Ottley (1879) for the Cebidae. It is innervated by the 

 upper branch of the oculomotor nerve. 



M. rectus lateralis: Origin from the orbito- and alisphenoid where 

 its fascicles of origin constitute the lateral part of the common ten- 

 dmous ring. The continuing fleshy fibers form a laterally compressed 

 and large belly which runs on the outer side of the eyeball under the 

 lacrimal gland. The muscle is inserted by a thin tendinous expansion 

 on the sclera in front of the equator. The abducens nerve supplies it 

 on its medial surface. 



® 



M.l».«5. 



Figure 10. — Ocular muscles (1, m. levator palpebrae superioris; 2, m. rectus superior; 3, 

 m. obliquus superior, its pulley and tendon; 4, m. rectus medialis; 5, m. obliquus inferior; 

 6, m. rectus inferior; 7, m. rectus lateralis). 



