LECTURE 8 mouth and associated organs Flashcards
contents of oral cavity
tongue, teeth, internal salivary glands
associated organs of oral cavity
external salivary glands
boundaries of oral cavity
lips anteriorly, cheeks laterally, palate superiorly, tongue inferiorly, oropharynx posteriorly
2 parts of mouth
vestibule (between teeth and lips), oral cavity proper (posterior to teeth)
description of oral mucosa
thick stratified squamous epithelium, some keratinization
description of lips
labia, keep food inside mouth during chewing, composed of orbicularis oris muscle, covered by thin layer of hairless skin
description of cheeks
muscles of mastication, temporalis and masseter (elevate mandible, close mouth), buccinator (sucking), digastric (depress mandible against resistance, opens mouth), pterygoids (lateral movement), all muscles of mastication insert on mandible
description of hard palate
anterior part of palate, provides surface for tongue to force food against during chewing, mechanical breakdown
description of soft palate
posterior, ends in uvula
description of tongue
creates floor of oral cavity, made of skeletal muscle with a CT septum
attachments of tongue
hyoid, mandible, temporal bone (styloid process), soft palate
functions of tongue
houses taste buds (gustation), speech production, mixes food with saliva (bolus), grips and moves food between teeth during chewing, moves bolus down pharynx (voluntary swallowing)
muscles of tongue
intrinsic muscles change shape; extrinsic muscles move, protrude, react
nerves of tongue
motor: hypoglossal XII, sensory: mandibular V3, facial VII, glossopharyngeal IX
description of intrinsic salivary glands
exocrine glands; in mucosa of tongue, palate, lips and cheeks; keeps mouth moist at all times
