44 SURGICAL ANATOMY OP 



Superiorly, from above downwards (omitting the dura 

 mater): (1) The frontal vessels and nerves, and behind 

 in the same plane the fourth nerve ; (2) the levator pal- 

 pebrse muscle; (3) the rectus superior; (4) the superior 

 set of the muscular branches of the ophthalmic artery, 

 and the superior division of the third nerve; (5) the 

 nasal nerve and ophthalmic artery, and the ciliary ves- 

 sels and nerves. 



Inferiorly, from below upwards: (1) The inferior 

 rectus, and the inferior oblique muscles; (2) the inferior 

 division of the third nerve, and its branch to the lenticu- 

 lar ganglion; (3) the inferior set of muscular vessels. 



Internally, from within outwards: (1) The superior 

 oblique and internal rectus muscles. (2) The termina- 

 tion of the fourth nerve, the nasal nerve, the ophthalmic 

 artery and vein, and the anterior ethmoidal artery. 



Externally, from without inwards: (1) The lachry- 

 mal vessels and nerve, and the lachrymal gland. (2) 

 The external rectus muscle, between the two heads of 

 which pass, both divisions of the third nerve, the nasal 

 of the fifth, the sixth nerve, and the ophthalmic vein. 

 (3) The nasal nerve, lenticular ganglion, and ophthal- 

 mic artery. 



The structures divided in the operation of extirpation of 

 the globe are the conjunctiva, the subconjunctival tissue, 

 the tendons of the recti and obliqui with their aponeu- 

 rotic sheaths, the optjc nerve, and the long and short 

 ciliary vessels and nerves. 



The structures divided in the operation for strabismus 

 are the conjunctiva, subconjunctival tissue, and rectus 

 tendon with its aponeurotic sheath. 



