ß50 Pr. HARRTS H WILDER, 



since it is supplied by the facialis; while the posterior portion seems 

 to possess no equivalent in man. „Dieser Muskel ist als ein indirectes 

 Homologou des Digastricus maxillae inferioris des Menschen zu be- 

 trachten, in der Art, dass jedoch nur der hintere Bauch in Betrachtung 

 kommt, welcher beim Menschen von dem Ramus digastricus aus dem 

 N. facialis versorgt wird. Die zweite, bei Siren, Siredon, Proteus, 

 Mendbranchus und Ämphiuma von dem Dorsalsegment des ersten 

 Kiemenbogens entspringende Portion ist als ein den Perennibranchiaten 

 eigener Muskel aufzufassen" (D. 91). 



3. Temporaiis (fronto-parieto-maxillaris) (fig. 1 0- 



Preparation. The preparation of this muscle presents con- 

 siderable difficulty, especially if one desires to study the nerves in 

 the same dissection, on account of the intimate relation of the two 

 systems. The nerve relations are the following: After removal of the 

 masseter, the anterior intermuscular ligament appears as a thick fascia 

 covering tlie external surface of the temporalis. Upon this fascia and 

 hence between temporalis and masseter in the natural condition, run 

 the two branches of the trigeminus, R. ophthalmicus superficialis and 

 R. maxillae superioris. From a deeper origin than these, the R. oph- 

 thalmicus profundus runs almost directly across to the eye, accompanied 

 l)y the muscles and nerves of the eye. To prepare all, dissect the 

 two first nerves carefully away from the fascia ; then search upon the 

 upper surface of the muscle for a separating line in the fibres, running 

 diagonally, from a point in the median line about an third of the 

 length of the muscle from its anterior end, directly to the eye. Part 

 the fibres at this line and the temporalis is divided into its two 

 portions, between which, quite deeply, runs the R. ophthalmicus pro- 

 fundus, in company with the orbital muscles and nerves. 



Separate the posterior external portion at its origin, working 

 from above downward, and when free, draw it out from beneath the 

 Rami ophthalmicus superficialis and maxillae superioris previously 

 prepared. Then dissect out the R. ophthalmicus profundus, and finally 

 separate the anterior internal portion of the muscle at its origin, and 

 cut it away by pieces. 



Origin. Pars posterior arises from the median intermuscular 

 ligament and from the upper surface of the cranium, mostly from Os 

 parietale. Pars anterior arises also from the median intermuscular 

 ligament and from the surface of the frontal bone. 



