Cranial Nerves. 



129 



N. MENTAL. 



473. The Third Division (Eamus inframaxillarisj of 

 the Trigeminal Nerve. 



The III. inferior maxillary branch, both sensory and 

 motor, leaves the skull through the Foramen ovale of the sphenoid bone 

 and divides immediately after, into. two groups. 



The first, chiefly motor group divides into the following branches : 



a) The mass et eric, Nervus massetericus, passes outwards through 

 the sigmoid notch of the lower jaw, enters the masseter and supplies 

 it and the articulation of the jaw; 



b) The deep temporal, Nervi temporalis profundi, to the M. temporalis ; 



c) The buccal or Nervus buccinator ius, to the M, buccinator; 



d) The two pterygoid, Nervi pterygoidei, an internal and an 

 external for the two MM. pterygoidei. 



The second, chiefly sensory group, gives off the folio wing branches: 

 a) The auriculo-temporal, N. auriculo-temporalis s. temporalis super- 

 ficialis ; this arises by two roots, between which the middle meningeal artery 

 (Art. meningea media) (see Fig. 477) passes, and divides behind the condyle of 

 the lower jaw into two branches, the posterior for the M. attrahens auriculae, 

 the skin of the auricle and partly the external auditory ineatus, and the 

 anterior for the integument of the temporal region. 



