H&N 4: Oral & Nasal Cavities #1 Flashcards
What is the function of the mouth?
- gateway to GI system
- where food + drink initially tasted, mixed with saliva, masticated + if deemed palatable, voluntarily swallowed
What is food processing through the gut like?
- automatic
- go down pharynx, oesophagus + stomach
List 2 areas oral cavity made up of
- Vestibule
2. Oral cavity proper
What is the vestibule?
- space between teeth + mucosal inner lining of cheeks + lips
- communicates with behind last molar tooth (3rd for most)
What is the oral cavity proper?
space contained within the upper + lower dental arches + filled by tongue when mouth open
What is under the palatopharyngeal arch?
palatopharyngeus
What does the palatine tonsil form part of?
ring of lymphoid tissue found in oral cavity
What is under the palatoglossal arch?
Palatoglossus
Where is the hard palate?
behind upper teeth
What is function of soft palate?
cuts nasal from oral cavity during swallowing
Why does the tongue have a rough surface?
due to keratinisation
How does the mucous mem of bottom of tongue compare to top?
thinner
What is lingual frenulum?
connects tongue to floor of mouth
What does the skeleton of the oral cavity consist of?
- maxilla + palatine - form roof
- maxilla + mandible with dental arches form ant. boundary
What does the floor + post. walls of oral cavity formed by + sig?
- soft tissues
- poss to put food in mouth
What is the function of the maxilla?
- forms ant. boundary of upper part of oral cavity
- forms ant. 2/3 of roof
- sep oral from nasal cavity
What is the remaining 1/3 of roof formed by?
- palatine (horizontal plate) to which soft palate attached
List the muscles of the soft palate (post. aspect)
- levator palati
- palatopharyngeus
- palatoglossus
- tensor palati
What is function of levator + tensor palati?
tense + raise soft palate to close off nasal cavity during swallowing
What is the function of palatopharyngeus + palatoglossus?
hold soft palate down so still breathe while chewing + food doesn’t go from oral cavity into pharynx + resp system
What is the function of buccinator + nerve its supplied by?
- push cheek towards teeth to stop food entering vestibule during chewing
- supplied by facial nerve
What is function of genioglossus and its origin?
- forms bulk of tongue
- comes from mandible bend
- use to poke tongue out
Where is geniohyoid located?
from bend in mandible to hyoid bone
What is function of ant. belly of digastric + mylohyoid + what are they supplied by?
- relax to allow food to enter mouth
- move larynx up during swallowing to get it out of the way
- mandibular division of V
