440 TOPOGRAPHICAL ANATOMY. 



horizontal line backwards ; internally, by proc. styloideus, lig. 

 stylo-maxillar., hyoideum. The parotis occupies nearly the 

 whole of this space, and is all round enclosed in fascia. Parts 

 from without inwards: 1. Skin, slightly hairy (behind the beard 

 of the cheek). 2. Close areolar tissue, having little fat, with 

 branches of n. auricular, from plex. cervicalis. 3. Lymphatic 

 glands. 4. Parotis ; from it upwards : art,, ven. temp., rr. tem- 

 poral, n. maxill. infer. ; behind : art. auricular, post., and rr. 

 auricul. n. facial, and plexus cervical. Inside the parotis: 1. 

 behind, n. facialis, 6'" deep ; in front its branches 5'" deep. 2. 

 V. parotidece. 3. deeper, carotis externa, close to the proc. styloid. 



[Dissection. As described in the first part, under 6, d. TRANS.] 



The Trunk. 

 692. I. The Neck. Anterior cervical region. 



a. Supra hyoideal, reg. supra-hyoidea, lies between lower jaw 

 and hyoid bone, forms the floor of the mouth. 



In the middle line (submental region) lie : 1. skin (in the male 

 hairy) with a thicker or thinner layer of fat. 2. Mm. platysmam. 

 with superficial nerves of the plex. cervical, and branches of art. 

 mentalis. 3. Ventr. anter. in. digastric. 4. Deep branches of 

 art. submentalis. 5. Mm. mylohyoidei. 6. Mm. geniohyoidei. 

 7. Genio-glossi. 8. In front and above : glandula sublinguaL, 

 with ductus WTiartonian. and the mucous membrane of the mouth ; 

 below and behind, the tongue. Laterally, we find over the m. 

 platysmam. the following parts : 1. Layer of fasc. cervical. 2. 

 Plexus of art. and ven. submental. (facialis), the vasa lymphat. 

 facial. , the n. mylo-hyoid. (dental, infer.), branches of facialis 

 and superficial branches of plexus cervicalis ; between them gland, 

 submaxillar. and lymphatic glands. 3. M. mylohyoideus. 4. 

 Above and before, gland. sublinguaL, duct. Wharton. (above), n. 

 lingual, and art. sublinguaL (below the glands), then beneath 

 the mucous membrane below arid behind : 1. N. hypogloss. and 

 ven. lingual, close to the great cornua of the hyoid bone. 2. M. 

 stylo-, hyoglossus. 3. Art. lingual, and n. glosso-pharyngem 

 and tongue. 



Ven. facialis passes upon the external, art. facialis on the in- 

 ternal side of the gland, submaxillaris ; art. submental. below it 

 on the inferior border of the lower jaw ; n. mylohyoideus still 

 deeper. 



b. Infrahyoideal region, reg. infrahyoidea. s. interstitium jugu- 

 lare, a triangle the base of which is formed by the os hyoides, the 



