234 Mammalia. 



main terminal branches of the external carotid. It may be 

 traced back into the internal substance of the Parotid gland, 

 by which its origin below the condyle of the jaw is concealed ; 

 and at the point at which it crosses the inferior dental nerve it 

 maybe seen to curve horizontally forwards between the jaw and 

 the internal lateral ligament of the temporo-maxillary joint ; 

 thence it may be traced obliquely forwards and upwards on 

 the outer surface of the smaller belly of the external Pterygoid 

 muscle ; and then inwards between the two bellies of this 

 muscle, just internal to the buccal branch of the inferior 

 maxillary nerve (which crosses it at right angles), to the 

 spheno-maxillary fossa, where it divides into two main 

 branches : the bifurcation taking place immediately internal 

 to a hooked process which projects backwards from that 

 upper part of the sphenoid bone known as the Ali-sphenoid. 



In tracing the Internal Maxillary Artery backwards care 

 must be taken not to cut across that branch of the external 

 carotid which supplies the Parotid gland, and which leaves 

 the upper side of the bend of the internal maxillary much in 

 the same way as the carotids themselves leave the aortic arch. 

 And secondly, care must be taken to avoid cutting through 

 the auriculo-temporal branch of the inferior maxillary nerve 

 which was first exposed as the superior nerve tract in the 

 dissection of the Parotid gland. 



Hemoval of Coronoid Process, part of the Condyle, 

 AND REMAINS OP Ramus OF LowER J AW. The Student 

 should now take a fine saw, and cut part of the way through 

 the internal angle of the condyle of the jaw, completing the 

 fracture with the ' bone-nippers ' so as to avoid injuring 

 the subjacent structures ; remove the bone ; and also cut 

 away the unattached portions of the anterior belly of the ex- 

 ternal Pterygoid, avoiding any injury to the buccal nerve 

 which lies internal to it, as it courses from the posterior angle 

 of the superior maxilla towards the inner aspect of the 



