. Comparative anatomy. Anatomy, Comparative. 3o6 COMPARATIVE ANATOMY The Pharynx The pharynx is that part of the ahmentary canal where the respiratory and digestive passages cross one another. The constricted opening through which the mouth cavity communicates with the pharynx is the isthmus faucium. It is bordered by the soft palate above, the tongue below, and the glossopalatine arch on each side. The glossopalatine arch partially covers the palatine tonsil, a mass of adenoid tissue pitted with PARIETAL BONF GYRUS CINGULI PITUITARY, RIGHT CEREBRAL HEMISPHERE RPUS CALLDSUM FORNIX PINEAL GLAND
. Comparative anatomy. Anatomy, Comparative. 3o6 COMPARATIVE ANATOMY The Pharynx The pharynx is that part of the ahmentary canal where the respiratory and digestive passages cross one another. The constricted opening through which the mouth cavity communicates with the pharynx is the isthmus faucium. It is bordered by the soft palate above, the tongue below, and the glossopalatine arch on each side. The glossopalatine arch partially covers the palatine tonsil, a mass of adenoid tissue pitted with PARIETAL BONF GYRUS CINGULI PITUITARY, RIGHT CEREBRAL HEMISPHERE RPUS CALLDSUM FORNIX PINEAL GLAND. SUBDURAL CAVITY- FRONTAL LOBE- FRONTAL BONE DURA MATER NASAL ^^^^—^^m^S^^^iai^ffi Iwaai^B^Si.'J \y/'^w'~°^'^^^"'^^ ^°^^ SPHENOID BONE- ' j • ^ NASAL C0NCHAE-="=*^^^^^^^^^^^^^^3^"^^^^--^ ^"^^^^^^Sa^^^S^^^^^EREBELUW EUSTACHIAN TUBE MAXILLA- MOUTH CAVITY- PALATINE BONE- VESTIBULE- SOFT PALATE M. GENIOCLOSSUS MANDIBLE- M. GENIOHYOID--^'^^^^ M. MYLOHYOID PHARYNX^ EPIGLOTTIS'' LARYNX ^\?U,^- ESOPHAGUS' XENTRA Fig. 257.—A median longitudinal section of the human head showing the rela- tions between digestive and respiratory passages in the pharyngeal region. (Redrawn after Braus.) numerous crypts which tend to be a source of infection. The isthmus is surrounded on all sides by adenoid tissue, the lingual tonsil being included in the ring. The hypertrophy of adenoid tissue, especially that of the soft palate in childhood, interferes with breathing and often requires surgical treatment. (Fig. 257) The soft palate is a muscular partition separating digestive and respiratory portions of the pharynx. From its posterior border hangs the uvula. By the action of the palatine muscles, the food pushed by the tongue into the pharynx is forced backwards towards the esophagus and prevented from entering the nasal portion of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
