36 TOPOGRAPHICAL ANATOMY OF THE 



N. AUHICULOPALPEBRALIS. — The origin of the auriculopalpebral 

 from the seventh cerebral nerve is, as yet, hidden by the parotid gland. 

 Its distribution, however, can be determined at the present time. The 

 nerve crosses tiie zygomatic arch in the neighbourhood of the 

 mandibular joint in company with the anterior auricular vessels, and 

 turns forwards between the temporal and scutular muscles. It becomes 

 superficial between the origins of the two parts of the fronto-scutular 

 muscle and thus gains the supraorbital region, where its branches are 

 connected with the frontal and lachrymal nerves. 



The auriculo-palpebral nerve supplies the orbicularis oculi, corrugator 

 supercilii and scutular muscles. It also furnishes small anterior 

 auricular nerves (un. auriculares anteriores), which blend with branches 

 from the fifth cerebral nerve to form the anterior a.uricular plexus 

 (plexus auricularis anterior) and supply the anterior and inferior 

 auricular muscles. 



N. LACKIMALIS. — A branch of the lachrymal nerve (ramus 

 zygomaticotemporalis) becomes visible close to the point of union of 

 the zygomatic process of the frontal bone with the zygomatic arch. Its 

 filaments form a plexus with the frontal and auriculo-palpebral nerves, 

 and some of them travel backwards along the zygomatic arch towards 

 the ear. 



N. FRONTALIS. — The frontal, like the lachrymal, is derived from the 

 ophthalmic nerve (a part of the fifth cerebral). It leaves the orbit by 

 the supra-orbital foramen and, communicating with the auriculo- 

 palpebral and lachrymal nerves, ends in the skin of the forehead and 

 the upper eyelid. 



N. INFRATROCHLEARIS. — The small infra-trochlear nerve, like the 

 two preceding, is ultimately derived from the ophthalmic and has its 

 origin within the orbit. In the present dissection it appears near the 

 medial angle of the eye, and supplies branches to the skin of this 

 neighbourhood. 



Nn. buccales. — The two buccal ^ nerves, dorsal and ventral, may 

 be regarded as the terminal branches of the seventh cerebral nerve. 

 They appear as a single flattened nerve-cord between the anterior 

 border of the parotid gland and the masseter muscle. After a short 

 course on the surface of the masseter, the cord resolves itself into the 

 two nerves." 



1 Bucca [L.], the cheek. 



- The exact disposition of the buccal nerves is liable to some variation. The 

 description as given above may be taken as applying to the average arrangement. 

 In the dissection from which Fig. 12 was drawn, the separation of the two nerves 

 was late in occurring. 



