HEAD AND NECK: ORAL CAVITY Flashcards by HARSHA K

slit like space extending from lips to oropharyngeal isthmus

oral cavity

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superior and inferior limitations of oral cavity

reflections of mucous membrane from lips and cheeks onto gums

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roof of oral cavity by

hard palate - front
soft palate - behind

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floor of oral cavity by

ant. 2/3rd tongue
mucous membrane reflection from tongue to gums of mandible

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components of oral cavity

oral vestibule
oral cavity proper

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oral vestibule lies between

gums and teeth

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oral cavity proper lies

within and behind the teeth arch

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external communication of oral vestibule thru

oral fissure (oral orifice)

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where does oral vestibule communicate with oral cavity proper

behind 3rd molar (jaws closed)

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what structure attaches tongue to the floor

frenulum

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what is frenulum

fold of mucous membrane

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what is the small papilla on the floor of the mouth on either side of frenulum

orifice of Wharton’s duct of submandibular gland

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what is the rounded ridge of mucous membrane extending laterally backwards from the papilla

sublingual fold

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what forms the sublingual fold

protrusion of the sublingual gland

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lateral wall of vestibule is formed by

cheeks

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cheeks are composed of

buccinator muscle

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outer covering of cheek

skin and buccopharyngeal fascia

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where does the Stensen’s duct open

opposite the 2nd upper molar

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nerve supply of the roof of the mouth

greater palatine nerve, nasopalatine nerve (maxillary division of CN V/ CN V2)

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nerve supply of floor of mouth

lingual nerve (mandibular division of CN V/ CN V3)

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taste fibers arise from

chorda tympani (facial nerve branch)

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nerve supply of cheek

buccal nerve (branch of CN V3)

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layers of tooth

outer - enamel
inner- dentin

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hardest material in body

enamel

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main part of tooth

dentin

largest dental tissue

dentin

soft tissue of tooth

pulp

what structures does pulp contain

blood vessels & nerves

which structure has the ability to produce dentin

pulp

function of the root of tooth

secure & anchor tooth to jaw

sets of teeth in human

2: deciduous (milk teeth) & permanent

number and types of deciduous teeth

20 4 incisors, 2 canines, 4 molars (1&2)

number and types of permanent teeth

32 4 incisors, 2 canines, 4 premolars, 6 molars

central incisor (milk) age of eruption

6-8 mos

lateral incisor (milk) age of eruption

8-10 mos

canines/ cuspids (milk) age of eruption

18 mos

molars (milk) age of eruption

1st - 1 year 2nd - 2 years

which deciduous teeth erupt first

bottom central incisors

which deciduous teeth erupt after the bottom central incisors

top 4 teeth

permanent incisors age of eruption

central - 7years lateral - 8 years

1st permanent molar age of eruption

6-7 yrs

permanent premolars age of eruption

1st - 9yrs 2nd - 10 yrs

permanent canines age of eruption

11 yrs

2nd permanent molar age of eruption

12 yrs

3rd molar age of eruption

17-30 yrs

dental condition associated with congenital syphilis

hutchinson teeth (notch teeth)

notch teeth appearance

triangular or peg like permanent incisors and molars

hereditary factors associated with enamel hypoplasia

amelogenesis imperfecta ellis-van-creveld syndrome

factors associated with enamel hypoplasia

prematurity hypoparathyroidism high fluoride ingestion malnutrition vitamin deficiencies hypothyroidism LBW DM congenital Syphilis

what is supernumerary tooth

tooth or odontogenic structure formed in excess

when does an impacted tooth occur

3rd molar's awkward growth angle or insufficient room

teeth that first arise in the condition neonatal teeth

one or two central mandibular incisors

structure that divides tongue into anterior and posterior parts

sulcus terminalis

apex of sulcus terminalis

foramen cecum

what is foramen cecum

embryological remnant of thyroglossal duct

papillae present on the tongue dorsum

filiform fungiform foliate circumvallate/vallate

filiform papillae have whitish appearance due to

thick cornified epithelium

papillae without taste buds

filiform

papillae with vascular CT core

fungiform

how many are circumvallate papillae

10-12

number of taste buds in foliate papillae

~ 1000

structure beneath foliate papillae

serous gland of von ebner

epithelium of tastebuds

stratified squamous epithelium

posterior part of tongue consists of

lingual tonsil

posterior part of tongue consists of papillae: true or false

false

irregular nodular surface of posterior tongue is due to

LNs under lingual tonsil

what is plica fimbriata

fringed mucous fold on ventral tongue

general sensation to tongue by

lingual nerve (CN V3)

motor sensation to tongue by

hypoglossal nerve (CN XII) vagus nerve (palatoglossus muscle)

intrinsic muscles of tongue

longitudinal & transverse

action of intrinsic muscles

shape alteration

extrinsic muscles of tongue

hyoglossus styloglossus genioglossus palatoglossus

blood supply of tongue

lingual artery (ECA branch) tonsillar branch of facial artery

vein supply of tongue

lingual veins(to IJV) dorsal lingual vein deep lingual vein sublingual vein

LNs on tip of tongue

submental LNs

LNs of anterior tongue

submandibular deep cervical

LNs of posterior tongue

deep cervical

an unusually short thick frenulum results in what condition

ankyloglossia (tongue tie)

what happens in ankyloglossia

mobility is reduced

hard palate is formed by

palatine processes of maxilla horizontal plate of palatine bones

hard palate is bounded by

alveolar arches

covering of hard palate

mucoperiosteum

corrugations of mucous membrane on either side of median ridge of hard palate

palatine rugae

epithelium that covers mucous membrane of hard palate

stratified squamous epithelium

contents of soft palate

aponeurosis muscles lymphoid tissue vessels and nerves

posterior projection of soft palate

uvula

composition of soft palate

mucous membrane aponeurosis muscles

palatine aponeurosis is extended tendon of

tensor veli palatini

muscles of soft palate

tensor veli palatini levator veli palatini palatopharyngeus palatoglossus uvula/ muscularis uvulae

nerve supply of muscles of soft palate

pharyngeal plexus

pharyngeal plexus composition

sympathetic fibers of cervical ganglion somatic axons (mixed) from vagus (pharyngeal branch), accessory, hypoglossal nerves

blood supply of the palate

greater palatine (maxillary artery) ascending palatine (facial artery) ascending pharyngeal (ECA)

nerve supply of the palate

greater and lesser palatine nerves (enters thru' greater and lesser palatine foramina) nasopalatine (thru incisive foramen) glossopharyngeal nerve (supplies soft palate)

what causes cleft soft & hard palates

non-fusion of palatine processes

cleft palate repair is done commonly at what age

6-12 mos (avg: 9mos)

prosthesis used in cleft palate

obturator plate

problems with bifid uvula

trouble moving soft palate (eating, drinking, speaking) indigestion distorted speech