3 Regional Histology of Oral Mucosa Flashcards
where can you find LINING mucosa
- Labial
- Buccal
- Alveolar
mucosa - Soft palate
- Ventral tongue
- Floor of mouth
- Oropharynx
- Posterior 1/3
of tongue - Epiglottis and
larynx
where can you find SPECIALIZED mucosa
dorsal surface of ant 2/3 tongue AND vermillion zone
where can you find MASTICATORY mucosa
Hard palate (ant and post)
gingiva - free and attached
interdental papilla
what is mucogingival fold
transition from attached gingiva to alveolar mucosa
where is the mucoperiosteum located
palatal raphe and attached gingiva
what anatomical structure does the developmental origin/precursor 1 PA MAXILLARY PROCESS give rise to
upper lateral lip
what anatomical structure does the developmental origin/precursor FN - INTERMAXILLARY SEGMENT give rise to
philtrum
what anatomical structure does the developmental origin/precursor 1 PA MANDIBULAR PROCESS
lower lip
what innervates the mucosa of the upper lateral lip
V2 trigeminal - infraorbital
what innervates the mucosa of the philtrum
V2 trigeminal - infraorbital
what innervates the mucosa of the lower lip
V3 trigeminal - mental
what are the 3 regions on the lip
- outer cutaneous skin –> SSK
- vermillion zone –> SSK and mucocutaneous junction
- inner labial –> lining mucosa
what germ layer forms the epithelial of mucosa in the lip
ECTODERM! outside
what are are musculofibrous folds that function as valves (sphincter) of the oral fissure
lips
what type of epi is the outer cutaneous region and what is found there (glands, etc)
THIN SSK
hair follicles
sebaceous glands
sweat glands
vermillion border -> mucocutaneous junction
what is the vermillion zone
transition zone is located in the area between the dry skin and the wet
mucous membrane.
what type of epi is the vermillion zone and what is found there (glands, etc)
thicker SSK than face
NO glands
many sensory receptors - Meissners
deep CT papillae w/ lots of vascularity (red color)
what type of epi is the intermediate zone and what is found there (glands, etc)
Transition from from SSK to SSPK
Stratum granulosum disappears with SSPK
what is the intermediate zone
transition between vermillion zone and labial mucosa
what is the labial region (inner mucosa)
the labial surface
what type of epi is the labial region and what is found there (glands, etc)
Thick SSNK-lining mucosa
Well vascularized LP
Seromucous (mixed) minor salivary glands in submucosa
what muscle makes up core of lips
orbicularis oris muscle
boundaries of the buccal region (cheek)
- Oral and mental regions anteriorly
- Parotid region posteriorly
- Zygomatic region superiorly
- Inferior border of mandible inferiorly
what does the buccal region contain
- Buccinator mainly
- Buccal minor salivary glands
- Buccal branches of maxillary artery and V3
- Oral mucosa (Buccal)
histology features of cheek
- Thick SSNK
- Shallow rete ridges
- Dense submucosa –> Attached to skeletal muscle and Location of minor salivary glands(mixed) and adipose (buccal fat pad)
- Lining mucosa
what are fordyce’s spots and where are they
in the cheek
-White to yellow in color grossly
* Sebaceous glands appear as clusters of larger, pale vacuolated cells with a central placed nucleus. In 81% of cases, the Fordyce spot opens directly onto the surface
* Not associated with hair follicles
* Functionunknown
* Located on the VZ,labial and buccal mucosa or angle of the mouth
what type of glands are found in Fordyce’s spots
sebaceous glands
what type of glands are found in the cheek
MIXED
what is linea alba buccalis
reactive keratosis
what does the developmental origin/precursor 1 PA maxillary process give rise to
lateral palatal shelves and secondary palate
what does the developmental origin/precursor inter-maxillary segmental give rise to
primary palate
**definitive palate is the fusion of primary and secondary palate
what are the four regions of the palate
- midline raphe
- anterior lateral
- posterior hard palate
- soft palate
what mucosa is found in the midline raphe
masticatory mucosa and mucoperiosteum
what mucosa is found in the anterior lateral
masticatory mucosa with adipose in submucosa
what mucosa is found in the posterior hard palate
masticatory mucosa with mucous glands in submucosa
what mucosa is found in the soft palate
lining mucosa
what innverates the anterior palatine in region of incisors
branch of V2 -> nasopalatine n
what innverates the ant and post hard palate
branch of V2 -> greater palatine n
what innervates the soft palate
branch of V2 -> LESSER palatine n
what GL is in the palate
ECTODERM for epi and mucous salivary glands!
T/F
the anterior 2/3 of the hard palate is comprised of fibromuscular
tissue attached to posterior edge of hard palate
FALSE!!
anterior 2/3 of palate comprised of bone –> Palatine process of maxilla and horizontal plate of
palatine bone
what is the posterior 1/3 of the palate (soft palate) comprised of
fibromuscular tissue attached to posterior edge of hard palate
does each portion of the hard palate have 2 or 3 sides and what are they?
2!!
- nasal side -covered with respiratory epithelium (PSCC)
- oral side - covered with oral epithelium (extent of keratinization depends on location)
3 regions of the hard palate
- Midline Raphe
- Anterolateral: Fatty zone
- Posterolateral: Glandular zone
general features of hard palate
- Covered with masticatory mucosa
- Thick SSK to SSPK
- Long rete ridges
- Submucosa varies based on Location -> Traction bands
in the midline of the hard palate, what type of epi/mucosa or features are present
Midline Region:
* SSK
* Deep rete ridges
* Mucoperiosteum present
in the anterolateral region (AKA the fatty zone) of the hard palate, what type of epi/mucosa or features are present
Anterolateral Region: Fatty Zone :
* Epithelium folded into rugae
* SSK to SSPK
* Deep rete ridges and CT papillae
* Submucosa contains adipose tissue * CT contain neurovasculature
what is known as the fatty zone
the anterolateral region of hard palate. FOR PROTECTION!
in the posteriolateral region (AKA the glandular zone) of the hard palate, what type of epi/mucosa or features are present
Posteriolateral Region: Glandular Zone:
* SSPK to SSNK
* Masticatory mucosa
* Submucosa contain mucous glands
* Rete ridges transition from deep to flat
what is known as the glandular zonw
posteriolateral region of hard palate
what types of glands are in the posteriolateral region of hard palate
mucous glands (found in submucosa)
features of soft palate
- Thick SSNK
- Lining mucosa
- Shallow rete ridge:CT papillae interaction * Mucous glands present
- Skeletal muscle present
- Bone is ABSENT
T/F in the soft palate, we have NO mucous glands or skeletal muscle but do have bone
FALSE
we DO have mucous glands or skeletal muscle but NO bone -> soft palate
what type of epi is in the soft palate
THICK SSNK
HSV-1 (herpes) is a recurring lesion occurring where and how is it transmitted
-Recurring lesions occur on the outer lips (most often) or within the oral cavity (palate gingiva or tongue)
-Transmission occurs through saliva or direct contact
Following a primary infection in the oral mucosa epithelium, the ____________become the principal target of the herpes simplex virus.
trigeminal sensory neurons
is herpes retrograde or anterograde transport
RETROGRADE
-Virus lies dormant in host cell until reactivated by stress or illness resulting in recurring herpetic lesions.
-Pattern of recurrence reflects dermatomal pattern
what type of epi is in the posteriolateral region of the hard palate
SSPK - SSK
what type of epi is in hte cheek
THICK SSNK
what type of epi is in the vermillion zone
thicker than face SSK
what type of epi is in the intermediate zone
transition from SSK to SSPK
T/F
the labial region has thick SSNK lining mucosa
TRUE
