HEAD AND ANTERIOR CERVICAL STRUCTURES. 43 



The lymphatic system of the orbit, 901. (881) 

 Third nerve, 791-2-3, 900. (774~5> 880) 



Superior division. Inferior division. 

 Sixth nerve, 805-6, 900. (787-8, 880) 

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



"Internal rectus. Inferior rectus. External rectus." 

 Tenon's capsule. Tenon's space, 897. (876) 

 Inferior oblique, 893. (872) 



Relation of Tenon's capsule to the oblique muscles, 897. (876) 

 Action of the ocular muscles, 893. (8723) 

 Principal axes. 



Abduction and adduction. 

 Rotation of the cornea. 

 Action of: 



External rectus. Internal rectus. 

 Superior rectus. Inferior rectus. 

 Superior oblique. Inferior oblique. 



Divide the muscles and the optic nerve, and remove the eyeball from the optic. Note the form of the 

 eyeball, and expose the insertion of the ocular muscles. The orbital nerve should be traced, and the 

 periosteum of the lower portion of the orbit examined. 



Orbital or temporo-malar nerve, 7989. (7801) 



Temporal branch. Malar branch (orbital portion). 

 Orbital periosteum or periorbita, orbital muscle, 894. (874) 

 Examination of the eyeball, 878-9-80. (858-9-60) 



Anterior and posterior pole. 



Sagittal axis. 



Equator. 



Otic Ganglion. Maxillary Division of the Fifth Nerve, etc. 



Expose the otic ganglion ; to find the ganglion, follow the nerve to the internal pterygoid, 802. (783-4) 

 toward its origin, near its commencement, it gives off a branch which can be traced to the ganglion. 



Otic ganglion, 805. (787) 

 Motor root. 

 Sympathetic root. 

 Branches. 



The trunk of the maxillary division of the fifth nerve should now be exposed. With the saw, divide 

 the malar process of the maxilla by a cut just external to the infraorbital groove ; make a second cut 

 from the root of the zygoma inward and forward to the middle of the sphenoidal fissure and remove the 

 intermediate portions of bone. With the chisel, chip away the bone and expose the nerve and its 



branches in place. 



Maxillary division of the fifth nerve, 797-8. (780) 

 Posterior superior dental nerves, 799. (781) 

 Middle and anterior superior dental nerves, 799. (781) 

 Middle dental nerve. 

 Anterior dental nerve : 

 Nasal branch. 



Ganglion of Valentin. 

 Ganglion of Bochdalek. 



Internal maxillary artery : 



Infraorbital branch, 526-7. (517-18) 

 Orbital. 



Anterior dental branch. 

 Nasal branches. 



With the saw divide the anterior portion of the skull into two lateral parts by a sagittal cut passing 

 just to one side of the nasal septum. The septum must not be injured. 



The Nasal Fossae. Meckel's Ganglion, etc. 



The mucous membrane, etc., 930-1-3. (9091012) 

 Vestibule. Roof. Floor. 



