280 



LABORATORY MANUAL OF HUMAN ANATOMY 



How are the muscles of the eye (musculi oculi} inserted into 

 the eyeball (bulbus oculi} ? 



Oculomotor and Abducent Nerves (Nn. oculomotorius et abducens). 

 Study these two nerves through their course. 



(a) Oculomotor nerve (N. oculomotorius) (0. T. third nerve). 



(aa) Superior ramus (ramus superior). 



(ab) Inferior ramus (ramus inferior). 



(aba) Short root of ciliary ganglion (radix brevis ganglii 

 ciliaris) (0. T. motor root of lenticular ganglion). 



(b) Abducent nerve (N. abducens) (0. T. sixth nerve). What muscle 



does it innervate? 



FIG. 118. 



M. rect. sup.. .M. lev. palp. sup. 

 A. ophthal. i : M. obliq. sup. 



N. lacrimalis ^ 



N. frontalis -J 



N. trochlearis - -*. 



N. ophthal. sup. -j| 

 N. abducens 



M. rect. lat.- 



N. opticus. 



- Annulus tend. com. 

 [Zinni] 



. rect. med. 



M. rect. inf/ 



; N nasociliaris 



'Ram. inf. N. oculomotorii 



Schema of the annulus tendineus communis [Zinni] and its relations to the nerves of the orbit. (From 

 Poirier et Charpy, Trait6 d'Anat. hum., Paris, 1899, t. iii., 3, p. 794, Fig. 440.) 



Compare the arrangement of the various nerves in the supe- 

 rior orbital fissure (fissura orbitalis superior) (0. T. sphenoidal 

 fissure) with that of the nerves in the sinus cavernosus. What 

 are the principal differences ? 



Inferior Oblique Muscle of Eye (M. obliquus inferior). 



Replace the eyeball in its natural position. Evert lower eye- 

 lid, and dissect off conjunctiva in the region of the fornix con- 

 junctivae inferior. Find the inferior oblique muscle and clean 

 it. Study its origin, insertion, action, and innervation. 



