DISSECTION OF THE HEAD AND NECK 271 



cadaver by that of museum preparations, models, and atlases ; 

 include the following : 



(a) Tympanic nerve (N. tympanicus) (0. T. Jacobson's nerve). (Vide 



Spalteholz, Fig. 773.) 

 (aa) Tympanic plexus (plexus tympanicus [ Jacobsoni] ) . 



(aaa) Superior caroticotympanic nerve (N. caroticotym- 



panicus superior). 



(aab) Inferior caroticotympanic nerve (N. caroticotym- 



panicus inferior). 



(aac) Tubal ramus (ramus tubae). 



(b) Ramus anastomosing with the auricular branch of the vagus (ramus 



anastomoticus cum ramo auriculari N. vagi). 



(c) Pharyngeal rami (rami pharyngei). 



(d) Stylopharyngeal branch (ramus stylopharyngeus) . 



(e) Tonsillar rami (rami tonsillares) (0. T. tonsillitic branches). 

 (/) Lingual rami (rami linguales) (0. T. terminal branches). 



Cervical Part of Sympathetic System (Pars cervicalis S. sympathici). 

 Note that the sympathetic trunk (truncus sympathicus) in 

 the neck has only three ganglia upon it. (Fig. 92.) 



(a) Superior cervical ganglion (ganglion cervicale superius). 



What evidence is there that it represents four segmental sympa- 

 thetic ganglia? 



(b) Middle cervical ganglion (ganglion cervicale medium). 



Why does it probably correspond to two primitive ganglia? 



(c) Inferior cervical ganglion (ganglion cervicale inferius). 



Note that it represents at least two segmental ganglia. 



Study the exact level and relations of each of these ganglia. 

 Find the rami communicantes connecting them with the Nn. 

 cervicales. 



How much have you made out in your dissection of the fol- 

 lowing : 



(a) Jugular nerve (N. jugularis). 



(b) Internal carotid nerve (N. caroticus internus). 



(c) Internal carotid plexus (plexus caroticus internus). 



(d) External carotid nerves (Nn. carotid externi). 



(e) External carotid plexus (plexus caroticus externus). 



(f) Superior thyreoid plexus (plexus thyreoideus superior). 



(g) Lingual plexus (plexus lingualis). 



(h) External maxillary plexus (plexus maxillaris externus). 



(i) Sympathetic root of submaxillary ganglion (radix sympathica gan- 



glii submaxillaris , . 



(,;') Occipital plexus (plexus occipitalis) . 



(k) Posterior auricular plexus (plexus auricularis posterior). 

 (1) Superficial temporal plexus (plexus temporal superficialis) . 

 (m) Internal maxillary plexus (plexus maxillaris internus). 



