330 ORGANS OF SENSE. 



over the temple and upper portions of the face, by branches 

 termed temporal, malar, and buccal, which anastomose 

 with the auricular branch of the inferior maxillary, the 

 supra orbital, and infra orbital nerves. 



The cervico-facial descends, supplying the lower portions 

 of the face, and upper portions of the neck, by branches 

 called the maxillary, submaxillary, and cervical, which 

 communicate with the mental nerve and ascending fila- 

 ments of the cervical plexus.* 



Blood-vessels. The arteries supplying the organs of ex- 

 pression, come from the facial, transverse facial, occipital, 

 temporal, and internal maxillary of the external carotid, 

 and from the ophthalmic of the internal carotid artery, 

 (Fig. 'TS.) The veins correspond to the arteries those of 

 the external carotid go to the jugulars those of the inter- 

 nal carotid, to the cavernous sinus. 



CHAPTEK IV. 



ORGANS OF SENSE. 



SENSATION is defined to be a " change in the condition of 

 the mind, by which we become aware of an impression 

 made upon some part of the body," or it is styled the "con- 

 sciousness of an impression." 



Organs of sense are the instruments of receiving the im- 

 pression, through which a corresponding change in the 



* Another view of this complex nervous arrangement may be taken. Accord- 

 ing to many excellent observers, there are three divisions of the seventh 

 nerve, instead of two. The portio mollis, or auditory, and the portio dura, or 

 facial, have lying between them, from their very origin, a set of filaments 

 which can be dissected from them, and shown to unite in a nervous trunk of a 

 reddish color, strongly contrasting with the pure white tint of the facial. This 

 portio intermedia, as it has been called, can be traced closely connected with 

 the facial, following it into the aqueduct of Fallopius, and sending filaments to 

 both it and the auditory, and finally losing itself in the geniculate ganglion, 

 called, also, int umescentia gangliformis, or genuformis. This geniculate ganglion 

 also receives the two petrosal nerves, one of which is a branch of the Vidian, 



