Oral Cavity Flashcards
what is the oral vestibule?
space between teeth/gingivae and lips/cheeks
what is the oral cavity proper?
space between upper and lower dental arches
what is the name of the teeth we lose as we develop?
deciduous (primary) teeth
how many deciduous (primary) teeth are there?
20
how many permanent (secondary) teeth are there in total?
32
name the 4 types of permanent teeth
incisors
canines
premolars (bicuspids)
molars
how many incisors do we have?
8 (4 top & bottom)
how many canines do we have
4 (2 top & bottom)
how many premolars do we have?
8 (4 top & bottom)
how many molars do we have?
12 (6 top & bottom)
(including wisdom teeth)
name the 3 tissue layers of the teeth
enamel
dentine
pulp
name the anatomical parts of the teeth
crown
neck
root
the root of the tongue is attached to the…
mandible and hyoid
name the 4 parts of the tongue
root
body
apex
dorsum
name the structures of the dorsum of the tongue
- sulcus terminalis
- circumvallate (vallate) papillae
- filiform papillae
- fungiform papillae
- lingual tonsil
sulcus terminalis is made up of ____
circumvallate (vallate) papillae
what is the function of intrinsic tongue muscles?
alter shape of tongue
what is the function of the extrinsic tongue muscles?
alter position of tongue
name the intrinsic tongue muscles
- superior & inferior longitudinal
- transverse
- vertical
name the extrinsic tongue muscles
- genioglossus
- hyoglossus
- styloglossus
- palatoglossus
sensory innervation of the tongue
- lingual n (V3) -> ant 2/3
- glossopharyngeal n -> post 1/3
taste innervation of the tongue
chorda tympani (VII) -> ant 2/3
glossopharyngeal n -> post 1/3
motor innervation of the tongue
hypoglossal n
(except palatoglossus muscle: vagus n)
what nerve innervates a small spot on the dorsum of the tongue?
internal laryngeal n (CN X)
action of genioglossus
- BL depress tongue, especially central part, creating a longitudinal furrow
- post part pulls tongue ant for protrusion
- most ant part retracts apex of protruded tongue
- unilat deviate to contralateral side
action of hyoglossus
- depress tongue & curl sides
- helps shorten (retrude) tongue
action of styloglossus
retrude tongue & curl (elevate) sides, working w/ genioglossus to form central trough during swallowing
what is the isthmus of fauces?
space between oral cavity and oropharynx
action of superior longitudinal tongue muscle
- curls tongue longitudinally upward, elevating apex & sides of tongue
- shortens (retrudes) tongue
action of inferior longitudinal tongue muscle
- curls tongue longitudinally downward, depressing apex of tongue
- shortens (retrudes) tongue
action of transverse tongue muscle
narrows & elongates (protrudes) tongue
action of vertical tongue muscle
flattens and broadens tongue
name the bones of the hard palate
- palatine process of maxilla
- horizontal plate of palatine bone
name the components of the soft palate
- fauces
- uvula
- root of tongue
- palatoglossal pillar/arch/fold (palatoglossus)
- palatopharyngeal pillar/arch/fold (palatopharyngeus)
- tonsillar bed/fossa (palatine tonsil)
action of tensor veli palatini
tense soft palate and open mouth of pharyngotympanic tube during swallowing and yawning
action of levator veli palatini
elevates soft palate during swallowing and yawning
action of palatoglossus
elevates post. part of tongue and draws soft palate onto tongue
(constrict isthmus of fauces)
action of palatopharyngeus
tenses soft palate and pulls walls of pharynx superiorly, anteriorly and medially during swallowing
action of musculus uvulae
shortens uvula and pulls it superiorly
innervation of tensor veli palatini
medial pterygoid n (V3)
what muscles of the soft palate are innervated by CN X?
levator veli palatini
palatoglossus
palatopharyngeus
musculus uvulae
name the 3 salivary glands
- parotid
- submandibular
- sublingual
what are the functions of saliva?
- maintain moist environment for oral mucosa
- lubrication during chewing
- digestion & breakdown of starches
- prevention of tooth decay/maintenance of biofilm
location of sublingual gland
floor of oral cavity between mandible and genioglossus
blood supply of sublingual gland
sublingual & submental aa
innervation of sublingual glands
presynaptic PSNS secretomotor fibers from facial, chorda tympani, and lingual nn -> synapse in submandibular ganglion
