THE HEAD. 439 



688. 7. Cavity of the Gullet (s. Pharynx). 



The entrance to the larynx lies in the anterior part of the pha- 

 rynx, balow the isthmus faucium. 



[Dissection: see under 6. above, after c. TRANS.] 

 639. 8. Orbital region, regio orbitalis. 



a. Eyebrows. About the inner third of the superior margin 

 of the orbit the n.frontalis passes out, besides the artery. 



b. Eyelids. 1. Skin (very delicate). 2. Loose fatless areolar 

 tissue (which becomes easily infiltrated with serum). 3. M. or- 

 bicular, palpbr. 4. Artt. palpebrales. 5. Tarsus and lig. latum 

 palpbr. ; at the border of the orbital margin areolar tissue contain- 

 ing fat. 6. Conjunctiva. 



At the internal angle of the eyelid: 1. Most delicate skin. 2. 

 Venous plexus. 3. Lig. palpebr. intern. 4. Lacrymal sac, which 

 is separated externally by a fibrous layer from the caruncula, be- 

 low the last, and rather externally, the thin roof of the antrum 

 Highmori, and the origin of m. obliq. inferior. 



690. 9. Zygomatic fossa, Fossa zygomatica, 



below the temples, above the masseter, external to the orbits, inter- 

 nal to theparotis. The superficial portion is connected with the 

 deep (fossa spheno-maxillaris) by Jissura pterygo-maxillaris ; 

 that with the orbita byjiss. orbitalis inferior. It is formed by the : 



a. Sphenoid ; b. posterior part of sup. maxillary ; c. palate ; d. 

 condyle of infer, maxillary ; e. a portion of the temporal ; and f. 

 ethmoid bone. 



Parts ; below the zygoma and the insertion of m. temporalis : 

 1. Vasa temporaliamasseteric. 2. M. Pterygoid extern, with art. 

 maxillar. intern, betweeen its two portions, and plex. ven. ptery- 

 goid. 3. Below the insertion of m. pteryg. extern, internally n. 

 lingualis, in the centre n. dental, infer., externally temporal super- 

 ficialis. In the fossa spheno-maxillaris from above to below ; 

 (v. opthalmica, n. ophthalmic., oculomotor., pathetic., abducens in 

 the Jissura. orbit, superior) ; n. maxillar. super, from behind for- 

 wards ; ganglion Meckelii on the outer side offoram. spheno-pala- 

 tinum. 



[Dissection. As described in the second part, under b, d. TRANS.] 



691. 10. Parotid region, Regio parotidea, 



is bounded, anteriorly, by the posterior border of ram. maxillar. 

 infer. ; behind, by proc. mastoid. and meatus auditor, extern. ; 

 above, by zygoma ; below, by the angle of the lower jaw, and a 



