60 



Bones of the Skull. 



Sinus frontalis 



Concha nasalis media 



Os nasale 



Meatus nasi medius 



I Concha nasalis superior 



Meatus nasi superior 



Apertura sinus sphenoidalis 

 Sinus sphenoidalis 



Sella turcica 



Clivus 



Processus fron- 

 talis maxillae 



Os lacrimale 



Foramen 



>phcno- 

 Italatinuin 



Lamina medialis processus 

 pterygoidei 



Meatus nasopharyngeus 



'Concha nasalis inferior 

 eat us nasi inferior 



73. Nasal Cavity, Cavum nasi; right lateral wall, from the left. 



The cavum nasi (nasal cavity) (see also Figs. 57 60. 74 and 75) is impaired and 

 lies in the middle and upper part of the facial skull. It consists of the nasal cavity proper 

 and the accessory cavities which surround the former in front, above, lateral ward and behind; 

 these accessory cavities, sinus paranasales, are the sinus fronlates (in front and above), the 

 cellulae elhmoidales (lateralward almost in the whole depth), the sinus sphenoidales (behind 

 and above) and the sinus maxillares (lateralward). 



The lateral wall (see also Figs. 59, H6 and 74) is nearly sagittal, but somewhat 

 inclined from above and medianward downward and lateralward. It is formed in front by the 

 medial surface of the proc. frontalis maxillae, in front and in the middle by the facies nasalis 

 corpor. maxillae, further by the os lacrimale, by the medial wall of the labyrinthus ethmoidalis, 

 by the concha nasalis inferior, by the facies nasalis of the pars perpendicularis oss. palatini 

 and by the medial surface of the lamina medialis of the proc. pterygoideus oss. sphenoidalis. 

 From these bones hang down free the three conchae nasales (turbinated bones) which cover 

 over partially medianward three oblong fossae, the nasal passages. The meatus nasi superior 

 (upper nasal passage) , between the concha nasalis superior and media of the os ethmoid., 

 is the shortest and narrowest, present only in the posterior half of the nasal cavity ; it descends 

 somewhat obliquely toward the upper circumference of the foramen sphenopalatinum. The 

 meatus nasi medius (middle nasal passage), between the concha media and the concha inferior, 

 reaches from the anterior margin of the middle concha as far as the region of the foramen 

 sphenopalatinum. The meatus nasi inferior (inferior nasal passage), between the concha 

 nasal, inferior and the inferior wall of the nasal cavity, is the longest and at the same time 

 the most capacious. Lateralward from the septum, medianward from the conchae there remains 

 a slit-shaped space between which extends through the whole height of the nasal space, the 

 meatus nasi communis. The part of the cavity situated on each side behind the posterior ends 

 of the conchae is called the meatus nasopharyngeus; it is bounded above by the inferior 

 surface of the body of the sphenoid, the ala vomeris, the proc. vaginalis of the proc. pteryg. 

 oss. sphenoid, and the proc. sphenoidalis oss. palat., lateralward by the pars perpendicularis 

 oss. palat. and the lamina medialis proc. pteryg., below by the pars horizontalis oss. palat. and 

 medianward by the vomer ; behind , it opens by means of the choana (0. T. posterior nares) 

 (bounded by the same bones). 



