42 OUTLINES OF ANATOMY. 



Muscles of the orbit, 891-2. (870-1) 



(Superior and inferior recti. Superior and inferior obliques-.) 

 (Internal and external recti. Levator palpebrae superioris.) 



Fascia of the orbital muscles, 2, 894-5-6. (875-6) 



The sheaths of the orbital muscles and the check ligaments will be developed as the dissection \ ro- 

 ceeds. 



Levator palpebrse superioris, 892. (872) 



Divide the frontal nerve and turn it forward, also divide the levator palpebns superioris midway 

 between the origin and insertion, reflecting the anterior portion forward and the posterior portion to 

 the origin. The eyeball should be distended ; to do this, make a small oblique puncture at the junc- 

 tion of the sclerotic and cornea, insert the tip of a small blowpipe, and innate the eyeball. The supe- 

 rior rectus should then be exposed. 



The superior rectus (four recti muscles), 892. (871-2) 

 The superior oblique, trochlea, 892-3. (872-3)! 



Divide the superior rectus in the same manner as the levator palpebrse superioris^and reflect the divi- 

 sions. Carefully remove the fat and fascia and expose the structures posterior to the eyeball, noting 

 the plan of formation of the sheaths of the muscles as they are exposed. The optic nerve will be 

 exposed, and, crossing the optic nerve, the nasal nerve and the ophthalmic artery and vein. On the 

 outer side of the optic nerve, close to the ophthalmic artery, is the lenticular ganglion ; the roots of the 

 ganglion and the branches from it should be carefully traced. 



The nasal nerve, 796-7, 901. (778-9, 880) 



Branches: Long root to the lenticular ganglion. 

 Long ciliary nerves. 

 Infratrochlear nerve. 



Lenticular, ciliary, or ophthalmic ganglion, 797, 901. (779, 881) 

 Motor or short root. Sensory or long root. 

 Sympathetic root. Short ciliary nerves. 

 Optic nerve, 791, 897-8. (773, 877-8) 



Dural sheath, pial sheath. 



Ophthalmic artery, 530-1-2-3, 899. (521-2-3-4, 879) 

 Branches of the ophthalmic artery : 

 Arteria centralis retinae. 

 Muscular branches. 

 Ciliary arteries: 

 Short posterior. 

 Long posterior. 

 Anterior. 



Posterior ethmoidal : 

 Ethmoidal branches. 

 Meningeal branches. 

 Nasal branches. 

 Anterior ethmoidal : 



Ethmoidal. Meningeal. Nasal. 

 Frontal. Cutaneous or terminal. 



Palpebral. Frontal. Nasal. Lachrymal. Transverse nasa^. 

 Veins of the orbit, 663-4-5, 900. (650-1, 879) 

 Ophthalmic vein, or common ophthalmic vein. 

 Superior ophthalmic vein. 

 Tributaries: 



Superior muscular branches. 

 Ciliary veins : 



Anterior and posterior set. 

 Anterior and posterior ethmoidal veins. 

 Lachrymal vein. 

 Central vein of the retina. 

 Inferior ophthalmic vein. 

 Tributaries : 



Inferior muscular. 



Lower posterior ciliary veins. 



