Dissection of Cheep's Head. 235 



temporo-maxillary joint. The point of intersection of the 

 internal maxillary artery and tlie buccal nerve well defines 

 the separation between the two bellies of the external Ptery- 

 goid muscle. 



The Student should have before him at this stage of the 

 dissection the following nerve branches between the Par- 

 occipital process and the orbit, m., on the posterior aspect of 

 the Parotid gland, the Cervico-facial, Temporo-facial, and 

 Auricular branches of the Facial or portio dura of the Seventh* 

 nerve, converging to meet just behind the external meatus of 

 the Ear : on the internal aspect of the Parotid, the Auriculo- 

 temporal branch of the Inferior Maxillary nerve passing in- 

 wards close to the remains of the condyle of the jaw: on the 

 external aspect of the Internal Pterygoid muscle, in order from 

 behind forwards, first the small Mylo-hyoid nerve closely 

 attached to the Inferior Dental nerve ; and then the Chorda 

 Tympanif in juxtaposition with the Gustatory nerve, each 

 making for the external extremity of the broken condyle : and 

 lastly, the Buccal branch of the Inferior Maxillary nerve, cours- 

 ing from the direction of the posterior molars of the upper jaw, 

 back between the two bellies of the External Pterygoid mus- 

 cle towards the antero-internal aspect of the fractured condyle. 

 The Student will now pursue the Chorda tympani to the 

 Skull. He will find it leave the posterior side of the Gustatory 

 nerve at a point a little before this last nerve crosses internal 

 to the Inferior Dental nerve : and then pass internal to the 

 Inferior Dental, and Auriculo-temporal nerves, to reach the 

 skull by an aperture at the inner end of the Glasserian fissure, 

 i.e. that fissure which separates the articular part of the glenoid- 



Some anatomists consider Portio dura = vii.; and Portio mollis, or auditory, 

 = viii. cf. p. 238. 



t By means of the Chorda Tympani the Gustatory nerve is put in relation 

 with the Facial nerve : and it is also in communication with the Hypo-glossal 

 nerve by means of the plexus which its own branches form with branches of the 

 Hypo-glossal nerve at the inner border of the Hypo-glbssus muscle. 



