Till': NOSE 



10::; 



which lines t lie panmasal sinuses throughout is a eont inuat ion of tlic nasal mucosa ; it 

 is, however, paler, le-s vascular, somewhat thinner, and more loosely attached to 

 the bones. 



Vessels and nerves. The arteries of each nasal fossa arc the sphcno-palatinc artery from 

 tln> internal maxillary (p. .";:;_'), the Anterior :m>l interior cthmoidal artcric.- from (lie ophthalmic 



Fie;. 771. LATKIMI. WAI.I. OF TIIH: NO-IK, snuv INC; ( iiuncES OF ACCESSOKY CAVITIES. (Peaver.) 



Aperturei of middle ethmoidal eella Bulla ethmoldalla 



Probe In frontal Hiiiua 

 Frontal niiiu 



Apertures of posterior ethmoidal cells 

 Middle of uaaal concha 



Probe in aperture of sphenoidal sinua 

 Bphenoidal alnus 



' phraama sellas 



Cut surface of middle ooncha 

 Hiatua Beiuilimaris 



Probe in naso-laehrymal duct 

 Aooeauory opeuiug of maxillary aluu 



Middle nasal concha cut - 

 Probe in opening of maxillary alnua 



(p. 537), and the descending palatine artery from the internal maxillary (p. 531). The venous 

 plexuses of the mucous membrane are drained posteriorly by the spheno-palatine to join the 

 pterygoid plexus, superiorly by the anterior and posterior ethmoidal veins to join the superior 

 ophthalmic vein, and anteriorly by small branches to join the facial. The lymphatics form a well- 

 developed plexus which communicates, through the lymphatics surrounding the olfactory nerves, 



Fio. 772. DIAGRAM OF THE DISTRIBUTION OF THE NEUVES IN THE NASAL CAVITY. (Poirier and 



Charpy.) 

 The olfactory area is represented by dots. 



AXTKRIOR POSTERIOR 8V- 

 XTHHO1D PERWR NASAL 



I | AJtT.PAL. POSTHatOK 



/ XASAJ. 



ANTERIOR 

 \: PALATIKS 



POSTERIOR SUPERIOR 

 NASAL 



1 



with the subdural and subararhnoid space within the cranial cavity. Posteriorly two or more 

 well-developed trunks communicate with tho pharyngeal lymphatics, and anteriorly the nasal 

 lymphatics join with the lymphatics of the face. Tho olfactory nerves pass through the cribri- 

 form plate of the ethmoid lintic and arc distributed to the olfactory area (p. 959). The fifth 

 cranial nerve furnishes the following branches t< i each nasal fossa: branches from the naso-ciliary 

 68 



