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o

mass of lymphoid tissue on mucus membrane on roof and posterior wall

o

enlarged tonsils: adenoids

obstruct air passages from nose to nasopharynx-->mouth breathing

interferes with air exchange b/w nasopharynx and middle ear cavity

oral pharynx

bounded by soft palate superiorly and epiglottis of larynx inferiorly

two folds of mucus membrane from soft palate

o

palatoglossal fold

anterior fold

descends to jxn b/w anterior 2/3 and posterior 1/3 of tongue

dividing line b/w oral cavity and oral pharynx

o

palatopharyngeal arch

posterior fold

descends along lateral wall of pharynx

o

b/w arches: palatine tonsil

laryngeal pharynx

extends from epiglottis to lower border of cricoid cartilage

piriform recess

o

borders

medial: larynx

lateral: thyroid cartilage and thyrohyoid membrane

posterior: inferior constrictor

o

under mucosa: internal laryngeal nerve and recurrent laryngeal nerve

o

foreign bodies can get trapped

irritation of mucosa (sensory innervation by internal laryngeal and recurrent laryngeal)

leads to coughing

sharp objects-->infection or injury to nerves

Bisection of Head

o

nasal septum

o

deviates to one side

o

nasal cavity: wider on one side, narrower on the other

o

tongue

o

oral part: anterior 2/3

lies horizontally

covered with long filiform papillae

o

pharyngeal part: posterior 1/3

curved, vertical position

forms anterior wall of oral pharynx

no papillae

contains numerous lymphoid/lingual follicles

encapsuled

collectively make up lingual tonsil

o

sulcus terminalis

boundary b/w two tongue parts

inverted V

runs from palatoglossal arch to median pit: foramen cecum

foramen: embryological remnant of where thyroid developed

vallate papillae: 7-12

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