436 TOPOGRAPHICAL ANATOMY. 



below, by the apex of proc. mastoid. Parts : 1. Closely-applied 

 external skin and fatless fibro-cellular tissue. 2. M. retrahens 

 auricula, occipital. , sterno-mastoid., below the last m. splenius. 

 3. The anterior (auricular) vessels, nerves, and lymphatic glands 

 in the groove behind the ear, below m. retrahens ; behind, below 

 the skin, vasa et. nn. mastoidei. 4. Periosteum and bones pars 

 mastoid. of temporal bone, the posterior inferior angle of parietal, 

 and a little way from occipital bone \ for am. mastoid.^ sulcus late- 

 ralis (a small portion) ; sutur. mastoid. and squamosa ; cellul. mas- 

 toidece. 5. Dura mater with (a portion of) the sinus lateralis, 

 and tentor. cerebelli. 



In the new-born infant the posterior lateral fontanelle. 



[Dissection. 1. An incision from the root of the nose to the external occi- 

 pital protuberance, in the middle line. 2. In front, an incision from the root 

 of the nose extending outwards along the eyebrows to the anterior extremity 

 of the zygoma. 3. Behind, an incision from the external occipital protuberance 

 transversely outwards to the apex of the proc. mastoideus. The section should 

 be carried through the skin and subjacent fibro-cellular tissue, which are 

 then to be reflected outwards towards the ear, with very great care. TRANS.] 



5. Nasal region, Reg. nasalis. 



Interior of the nose. The opening of the lacrymal canal sur- 

 rounded by a fold of mucous membrane lies behind a projection 

 of the proc. nasalis of the upper jaw, an inch behind the anterior 

 nasal openings, on the external nasal wall. The inferior turbinate 

 bone is distant two lines from the floor of the nasal cavity. [This 

 varies considerably.] 



The opening of the Eustachian tube is found in the middle of 

 the side wall of the posterior nasal opening, equally as far removed 

 from the anterior, as the incisor teeth from the uvula. 



687. 6. The Mouth, Cavitas oris. 



(See before, " Cavities of the Face.") 



a. Arch of the palate. Parts: 1. Mucous membrane (firmly 

 connected to a fibrous cellular tissue) with nn. palatini posterr. 



2. Vasa et nn. palatini medii at the internal part of the alveolus. 



3. Vasa et nn. alveolares behind and infraorbitales before, on the 

 external part of the alveolus. 4. Palate and superior maxillary 

 bones. 



b. Soft palate velum pendulum palati extended transversely 

 across, behind the arch of the palate, four-sided, five lines high, is 

 on both sides covered with mucous membrane which anteriorly 



