A manual of anatomy . g from front to back). Upon the outer or lateral waU are three projections; the inferiorconcha (the largest), the middle and superior (smallest) conchalprocesses. The space between the floor and the inferior concha con-stitutes the inferior meatus and has the nasal duct opening into space between the inferior concha and the middle conchalprocesses is the middle meatus. As its front extremity is the infiin-dibulum that leads into the frontal sinus and anterior ethmoidalcells. In the middle of the outer wall is an opening that leads intothe maxillary sinus. Between t
A manual of anatomy . g from front to back). Upon the outer or lateral waU are three projections; the inferiorconcha (the largest), the middle and superior (smallest) conchalprocesses. The space between the floor and the inferior concha con-stitutes the inferior meatus and has the nasal duct opening into space between the inferior concha and the middle conchalprocesses is the middle meatus. As its front extremity is the infiin-dibulum that leads into the frontal sinus and anterior ethmoidalcells. In the middle of the outer wall is an opening that leads intothe maxillary sinus. Between the middle and superior conchal 271 272 THE RESPIRATORY SYSTEM processes lies the superior meatus that communicates with the pos-terior ethmoidal cells. Above the superior conchal process is asmall space called the sphenoethmoidal recess that communicates withthe sphenoidal sinus. The choanae, or posterior nares, are the openings by which thenasal cavities communicate with the pharynx. They are larger thanthe Fig. 198.—Median sagittal section through the head and neck, a, Superior meatus of thenose; b, middle meatus of the nose; c, inferior meatus of the nose; d, Eustachian (torus tuba-rius) cushion; e, orifice of auditory tube; /, palatoglossal fold; g, tonsil; h, palatopharyngealfold; k, aryepiglottic fold; t, ventricle of the larynx; in, vocal cord; «, vestibule of nose. The pharynx connects the nasal and oral cavities with the a description see page 290. THE LARYNX The larynx, or organ of voice is situated at the lower part of thepharynx between the trachea, below, and the base of the tongue, THE LARYNX 273 Male Female 44 mm. 36 mm. 43 rnni- 41 mm. 36 mm. 26 mm 136 mm. 112 mm above. It lies in the upper and front part of the neck where it causesa projection in the midline that will be described later. It extendsfrom the lower border of the third cervical vertebra to the lowerborder of the sixth cervical vertebra separated therefrom by thepharynx. Its
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