. Cunningham's Text-book of anatomy. Anatomy. THE PHAKYNX. 1141 segment (nasal portion), from the posterior margin of the septum of the nose at its inferior part horizontally backwards, measures 15 to 18 mm., and that of the middle segment, from the glosso- palatine arches to the posterior wall, about 10 mm. Below this level, the anterior and pos- terior walls gradually ajjproach one another, until, below the laryngeal orifice, they are in contact with one another. The transverse width of the pharynx also varies considerably. Immediately below the base of the skull the cavity is wide, as there
. Cunningham's Text-book of anatomy. Anatomy. THE PHAKYNX. 1141 segment (nasal portion), from the posterior margin of the septum of the nose at its inferior part horizontally backwards, measures 15 to 18 mm., and that of the middle segment, from the glosso- palatine arches to the posterior wall, about 10 mm. Below this level, the anterior and pos- terior walls gradually ajjproach one another, until, below the laryngeal orifice, they are in contact with one another. The transverse width of the pharynx also varies considerably. Immediately below the base of the skull the cavity is wide, as there is on each side a deep lateral recess, and it measures 35 mm., or rather more than lj inches. Opposite the middle of the soft palate the cavity narrows, and measures transversely 25 mm., or 1 inch. It again widens out below this level, and expands to a width of 45 mm., opposite the inferior margin of the laryngeal opening, where on each side there is a wide recess, called the piriform recess. Pharyngeal tonsil Choana Dura mater Tuba auditiva, labium posterius M. sterno-cleido- mastoideus V. jugularis interna M. constrictor superior Ganglion cervicale superius N. laryngeus superior II. constrictor pharyngis medius I wb j â ^MMf ^- stylopharyngeus ># mi 31. pharyngopalatinus. "7~ Sinus transversus /J f~- Mastoid process V. jugularis interna A. carotis interna 31. sterno-cleido-mastoideus 31. lev. reli palatini 31. digastrieus A. car. externa Os hyoideum {coruu major) Plica aryepiglottica Tuberculum comiculatum Interarytenoid fold X. sterno-cleido-inastoideus Fig. 901. -Interior of Pharynx and Structures in relation to its Lateral Walls. viewed from behind. Cavum Pharyngis.âThe cavity of the pharynx is partially intersected by the soft palate, which is attached anteriorly to the hard palate, and laterally to the lateral walls of the pharynx. This sheet, sloping obliquely backwards and down- wards, cuts into the cavity of the pharynx (Fig. 901), and, falling short of the
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