1 Overview of Oral Cavity and Oropharynx Flashcards
what begins as an ectodermal depression and represents the future oral cavity/mouth?
stomodeum
what is surrounded by the frontonasal region and the maxillary and mandibular processes of PA1?
stomodeum
what develops as part of the pharyngeal tube and is endodermally derived?
oropharynx
what PA does the oropharynx arise predominantly from?
PA 2, 3, and 4 (with a minor contribution)
what are the two parts of the oral cavity?
- oral vestibule
- oral cavity proper
what is the space between the lips (labial), cheeks (buccal) and anterior tooth surface?
oral vestibule
anterior and posterior boundary of the oral vestibule
anterior - lips
posterior - ramus of mandible
lateral and medial boundary of the oral vestibule
lateral - cheeks
medial - anterior tooth/gingiva/dental arch
function of the oral vestibule
chewing/mastication, speech
contents in the region of oral vestibule
- oral mucosa lining
- minor salivary glands of cheek and lips
- skeletal ms. of cheek and lips
- opening of parotid duct
what is the oval shaped area enclosed by upper and lower dental arch and opens posteriorly to oropharynx?
oral cavity proper
roof (superior) and floor (inferior) boundaries of the oral cavity proper
roof (superior) - hard and soft palate
floor (inferior) - tongue/floor of mouth
anterior/lateral and posterior boundary of the oral cavity proper
anterior/lateral - dental arch
posterior - palatine arch/palatoglossal fold
function of oral cavity proper
mechanical and chemical digestion, bolus formation, and speech
contents of oral cavity proper (10)
- oral mucosa covers all structures except tooth
- alveolar process/dental arch of max and mand
- teeth/periodontium
- gingiva
- tongue (oral part)
- floor of mouth
- sublingual caruncle (ducts for submandibular and sublingual glands)
- hard and soft palate
- minor salivary glands of dorsum and ventral tongue and palatal mucosa
- retromolar trigone (small triangular area posterior to 3rd molar)
what is the passage from oral cavity to oropharynx
oropharyngeal isthmus
superior and inferior boundaries of oropharynx
superior - soft palate
inferior - epiglottis
anterior and posterior boundaries of oropharynx
anterior - oral cavity proper/palatoglossal fold/base of tongue
posterior - pharyngeal muscles and C2 and C3
lateral walls of oropharynx
palatopharyngeal arch and tonsil
contents of oropharynx (7)
- oral/pharyngeal mucosa covering structures
- minor salivary glands
- palatopharyngeal fold
- palatine tonsil/tonsillar fossa
- pharyngeal tongue - tongue base
- lingual tonsils
- skeletal muscles of pharyngeal wall
what refers to a mucous membrane that lines a passageway leading to the outside surface of lines a hollow organ?
mucosa
Mucosa = _____ + _____
Mucosa = epithelium + variable amount of CT
Oral mucosal epithelium may be derived from ___ or ___ depending on location
ectoderm or endoderm
T/F: oral mucosa includes regions of the lips thru oropharynx
TRUE
what are the general components of oral mucosa
- oral epithelium
- lamina propria
- submucosa
- skeletal muscle or bone
in relation to the oral mucosa…
what is stratified squamous w/ variable amounts of keratinization?
oral epithelium
in relation to the oral mucosa…
what is the underlying CT containing capillaries, ducts of salivary glands, and sensory receptors?
lamina propria
in relation to the oral mucosa…
what is present in variable amounts, composed of LCT -> DICT, contains vessels, adipose, minor salivary glands, and sensory receptors?
submucosa
in relation to the oral mucosa…
what lies deep to the mucosa?
skeletal ms. or bone
what is the region where the attached gingival mucosa reflects off bone and onto alveolar mucosa (transition point)
mucogingival fold
what is the region which lacks a submucosa and lamina propria attaches directly to periosteum of bone?
mucoperiosteum
what is the fold of oral mucosa anchoring the alveolar process to lip, cheek, or ventral tongue to floor of mouth?
frenulum
what epithelium is ALWAYS stratified squamous with variable amounts of keratinization?
epithelium associated w/ oral mucosa
amount of keratinization is usually correlated with what? how can it be altered?
correlated with primary function of area and can be altered based on external events
turnover of epithelium is slower in regions with what?
regions with kerainization
key features of SSNK
- no stratum corneum
- nuclei RETAINED in superficial layer
layers in SSNK from free surface to BM
stratum superficialis
stratum inermedium
stratum spinosum
stratum basal
key features of SSPK
- minimal to absent SC (keratin filaments)
- nuclei RETAINED in superficial layer
layers in SSPK from free surface to BM
stratum superficialis
stratum granulosum
stratum spinosum
stratum basal
key features of SSK orthokeratinized
- stratum corneum present, nuclei LOST
- keratin filaments visible on surface
layers in SSK - orthokeratinized from free surface to BM
stratum corneum
stratum granulosium
stratum spinosum
stratum basal
3 types of oral mucosa
- lining
- specialized
- masticatory
what mucosa is most moist due to secretions, is less exposed to abrasion, and is soft, pliable, and movable?
lining mucosa
location of lining mucosa
wide distribution majority of oral cavity and oropharynx
lining mucosa epithelium
SSNK
describe lining mucosa lamina propria
LCT high elastic fibers; well vascularized
describe lining mucosa submucosa
well developed and usually attached to underlying ms., highly flexible, and contains minor salivary glands
what glands are present in the submucosa of lining mucosa
minor salivary glands
what mucosa functions in mastication, and is firm and immobile?
masticatory mucosa
location of masticatory mucosa
hard palate, gingiva, and interdental papilla
masticatory mucosa epithelium
SSPK to SSK
describe lamina propria of masticatory mucosa
LCT w/ high dense collagen fibers attached directly to bone
what is LP bound directly to bone and is present in some regions of palate and gingiva?
mucoperiosteum
descrcibe submucosa of masticatory mucosa
thin to absent
what mucosa refers to the presence of surface elevations of mucosa known as lingual papillae
specialized mucosa
T/F: lingual papillae may contain taste buds
TRUE
location of specialized muocsa
dorsum of anterior 2/3 of tongue
vermillion zone
specialized mucosa epithelium
SSK
specialized mucosa lamina propria
thin
specilized mucosa submucosa
thin to absent; minor salivary glands may be present, bound to skeletal ms
what type of glands may be found in specialized mucosa?
minor salivary glands
how many types of lingual papilla are there and their general function?
4 types
surface elevations to aid in mixing food
are taste buds found on all lingual papillae?
NO! All except filiform
