832 



PHYSIOLOGY. 



only to the skin, but also to all of the tissues of the head, compris- 

 ing the glands, meninges, organs of sense, bone, and dental pulp. 



Reflex Relations. By reason of the ciliary filaments the trigem- 

 inus is in particular reflex relation with the motor oculi and sympa- 



Iffaac. splentaa. 



Muse. tenu>cieidomaRto:dM. 



N. accessoriiu 



WHBC. levator anguli scapulas. 



Muse, cuculliiris or trapezit 

 N. don:ia icapnlaa. 



K. phrenicus. 



Krb'i 



Bupraclavicular- 

 point. 



Fig. 377. Distribution of the Sensory Nerves of the Head, together with 

 the Situation of the Motor Points on the Neck. (LANDOIS.) 



SO, Distribution of the supraorbital nerve. ST, Supratrochlear nerve. IT, 

 Infratrochlear nerve. L, Lacrymal nerve. N, Ethmoid nerve. 1O, Infraorbital 

 nerve. B, Buccinator nerve. SM, Subcutaneous malar nerve. AT, Auriculo- 

 temporal nerve. AM, Great auricular nerve. OMj, Greater occipital nerve. 

 OMi, Lesser occipital nerve. 3, Third cervical nerve. CS, Cutaneous branches 

 of the cervical nerves. CW, Situation of the central convolutions of the cere- 

 bral hemisphere. SC, Situation of the speech-center (third frontal convolution). 



thetic. Because of the ramifications of the trifacial branches in the 

 mucous membrane of the nose there is established a very intimate 

 relation with the expiratory muscles and nerves. Even the slightest 

 touch may occasion a sudden and violent sneeze, A close relation- 





