42 SURGICAL ANATOMY OF 



lulo-fatty mass is continuous with the cranial cellular 

 tissue, and with that of the zygomatic and spheno-maxil- 

 lary fossae. 



FIG. 4. 



Aponeuroses of orbit. (Altered from BERAUD.) 1. Dura mater. 2. Prolonga- 

 tion of dura mater into the posterior palatine canal. 3. Superior rectus in- 

 closed in its sheath. 4. Optic nerve. 5. Inferior rectus in its sheath. 6. Process 

 of aponeurosis of inferior oblique attached to the palpebral aponeurosis. 7. In- 

 ferior oculo-palpebral cul-de-sac. 8. Inferior tarsal cartilage. 9. Ocular portion 

 of orbito-ocular aponeurosis. 10. Superior tarsal cartilage. 11. Palpebral apon- 

 eurosis. 12. Superior oculo-palpebral cul-de-sac. 13. Process of aponeurosis of 

 superior oblique attached to the palpebral aponeurosis. 14. Periosteum of frontal 

 bone continuous with that of the orbit. 



The arteries are derived from the ophthalmic branch 

 of the internal carotid, which enters the optic foramen 

 below the nerve, and forms free anastomoses with the 

 temporal, facial, and internal maxillary. 



The veins generally accompany the arteries, and termi- 

 nate in a large vein, the ophthalmic, unprovided with 

 valves, which, after being formed both without and 

 within the orbit, passes as a trunk between the two heads 

 of the external rectus muscle, and enlarges into the 

 cavernous sinus. 



