DISSECTION OF THE HEAD AND NECK 



299 



knife and cut through the soft palate in the same plane. Then 

 saw through the bone from behind forward; the saw passes 

 through the hard palate and the roof of the nose. 



FIG. 128. 



Ramus anastomoticus cum N. spinoso Portio minor -v 



Cms longum incudis 



Membrana tyrnpani^^ 



Chorda tympani 



N. petrosus superficial minor 

 N. tensoris tympari 

 M. tensor tympani \ 



N. trigemini 



Portio major j 



N. masticatorius 



Manubrium mallei 



N. facialis X 

 N. auriculotemporalis 



Ganglion oticum 

 X. tensoris veli palatini 



N. pterygoideus 

 internus 



-N. pterygoideus 



externus 

 ^..V. tensor veli palatini 



Ramus anastomoti- 



cus cum N. auriculo- 



temporali 



Ramus anastomoticus 

 cum chorda tympani 

 N. lingualis 



Plexus caroticus internus with its 

 offshoots, the plexus maxillaris 



internus and meningeus , 



A. meningea media ! i_ , _ ,, ^-*^^, , 



N. alveolans infenor 

 t. pterygoideus internus 

 I. mylohyoideus 



The otic ganglion and its connections seen from the medial side. (After Toldt, Anat. Atlas, 

 Wien, 1903, 3 Aufl., p. 867, Fig. 1307.) 



Radix sympathica of the Ganglion oticum 



Otic Ganglion (Ganglion oticum) (O. T. Ganglion of Arnold). (Fig. 

 128.) 



Place the sagittal cut surface upward ; detach the M. levator 

 veli palatini at its origin and reflect it downward. Remove very 

 cautiously the pars cartilaginea tubae auditivae; the otic gan- 

 glion lies just beneath, between it and the N. mandibularis. A 

 useful guide is the nerve to the M. pterygoideus internus ; follow 

 it upward and backward to the otic ganglion. Find the fol- 

 lowing i ' roots ' ' : 



(a) Short root: from the N. mandibularis. 



(b) Long root: lesser superficial petrosal nerve (N. petrosus super- 



ficialis minor) ; probably contains motor fibres from N. facialis 

 and sensory fibres from N. glossopharyngeus. 



(c) Ganglionic or sympathetic root (radix sympathica} : from plexus 



in middle mening-eal artery. 

 Branches of Distribution. 



(a) Nerve of tensor muscle of palatine curtain (N. tensoris veli pala- 

 tini). 



