DISSECTION OF THE HEAD AND NECK 277 



forceps the upper part of the loose bursa-like tissue (fascia bulbi 

 [Tenoni]) (O. T. capsule of Tenon) at the back of the eyeball 

 and remove a bit with scissors. Through the opening thus made 

 introduce the handle of the knife, and explore the interfascial 

 space (spatium inter -fas dale [Tenoni]). Determine the extent 

 of the space. What is the relation of the tendons of the eye- 

 muscles to the fascia bulbi? 



Superior Straight and Superior Oblique Muscles of Eye (M. rectus 

 superior; M. obliquus superior). 



Establish the form, position, origin, insertion, innervation, 

 and action of each. Examine carefully the pulley (trochlea) 

 through which the tendon of the superior oblique muscle runs. 



FIG. 116. 



M. leva tor palpebral superior 

 M. obliquus superior 



Vasa ophthalmie'u 

 M. rectus lateralis 



N. ophthalmicus 

 M. rectus inferior 



Sinus maxillaris 



Frontal section through the right orbit behind the bulbus oculi. Posterior surface. (From Gegenbaur, 

 Lehrb. der Anat. des Mensch., Leipzig, 1899, 7 Aufl., Bd. ii. p. 589, Fig. 715.) 



Optic Nerve and Neighborhood. (Vide Fig. 116.) 



Cut through the M. rectus superior and reflect the ends. 

 Beneath its posterior part find the ramus superior of the N. 

 oculomotorius. Remove the fat over the optic nerve and study 

 the following structures : 



(a) Optic nerve (N. opticus). 



(b) Nasociliary nerve (N. nasociliaris) (0. T. nasal nerve). 



(ba) Long root of ciliary ganglion (radix longa ganglii ciliaris). 



(bb) Long ciliary nerves (Nn. ciliares longi). 



(be) Posterior ethmoidal nerve (N. ethmoidalis posterior). 



(bd) Anterior ethmoidal nerve (N. ethmoidalis anterior). 



(be) Infratrochlear nerve (N. infratrochlearis). 



(bea) Superior palpebral branch (ramus palpebralis supe- 

 rior). 



