Test 2 - Colombo - Oral Cavity Flashcards
List the borders of the oral cavity.
Ant - Lip Lat - Cheeks Sup - Hard/Soft palate Inf - Floor (Mucus membrane covering mylohyloid m.) Post - Oropharyngeal isthmus
The epithelium of the oral mucosa is what?
Where is it derived from?
What does it lack?
Stratified squamous, keratinzed or nonkeratinized.
Ectoderm.
Hair follicles!
The lamina propria of the oral mucosa is what?
Underlying CT, it contains small mixed glands.
What is the difference b/t the lining mucosa and the masticatory mucosa?
The lining has flatter, rounded rete pegs.
Masticatory has sharper, more pronounced rete pegs.
What do rete pegs do?
Offer stability
Tell me about the lining mucosa and where it is found in the oral cavity.
It is non-keratinized, strat. Squamous
Cheeks, inside of lips, floor of mouth, ventral tongue, soft palate
Tell me about the masticatory mucosa and where it is found.
Keratinized strat. Squamous.
Gingiva, parts of the dorsum tongue, hard palate
Tell me where specialized mucosa is found in the oral cavity.
Taste buds on the dorsal and lateral surfaces of the tongue
Intestinal mucosa has what layers?
Mucosa, lamina propria, muscularis mucosa, submucosa, muscularis externa
Oral mucosa has what layers?
Mucosa, lamina propria, submucosa, bone
*It may or may not be attached to bone
Tell me about oral mucoperiosteum.
Lacks submucosa and has few glands.
Mucosa, lamina propria, periosteum, bone
*Found on the medial hard palate and is usually the attached gingiva
There are two types of keratinization in the oral mucosa. Name and tell me about them.
Ortho - no nuclei visible in keratin layer
Para - some nuclei retained in keratin layer
Name the stratums in order from deep to superficial, and name what is in each layer.
Basale - stem cells & hemidesmosomes
Spinosum (Prickle) - Desmosomes
Granulosum - keratohyalin granule (keratin aggregation), and lamellar granules (lipid coating)
Corneum- anucleate and then acellular layer of stacks of cross-linked keratin coated w/ lipid
If there is no keratin, and no taste bud
looking things, we are probably dealing with what?
Lining mucosa
The soft palate is made of what?
Lining mucosa (non-keratinized) mingled with glandular tissue.
The hard palate is lined with what?
Masticatory epithelium (kera. Strat. Sq.)
3 types of gingiva. Name and describe them.
Attached - Firmly bound to bone around roots of teeth - STIPPLED
Free or marginal - lies unattached around cervical region of teeth
Interdental - the part of gingiva b/t teeth
What is the mucogingival line?
Delineates the attached gingiva from alveolar mucosa - transition b/t masticatory and lining mucosa
What are the epithelial differences b/t attached gingiva and alveolar mucosa?
Attached - ortho(para)-keratinized strat. Squamous - dense lp, many collagen bundles
Alveolar mucosa - non-keratinized - lp is looser w/ many elastic fibers, which give the mucosa elasticity
T/F - The skin is not keratinized.
FALSE.
Where is the transition to the labial mucosa?
At the mucocutaneous junction, or intermediate zone. (This transition zone is parakeratinized)
Tell me about the labial mucosa.
Non-keratinized, thick epithelium. Flexible.
90% of the cells of the oral mucosa are what?
Keratinocytes
The other 10% consist of three. Name and describe them.
Langerhans - found in spinosum - bind to antigens
Merkel - touch receptors the synapse w/ sensory nn.
Melanocytes - produce melanin, provide pigmentation
4 types of papillae you need to know. They are specialized mucosa.
Filiform- majority. On body of tongue.
Fungiform - larger than filiform. On tip of tongue.
Foliate- posterior sides of tongue.
Circumvallate - at the junction of the body and base of tonsillar area of tongue. LARGE. Only like 10 of them.
Describe the types of papillae.
Filiform - kera epi, no taste buds
Fungiform - nonkera epi, taste buds
Foliate - nonkera epi, taste buds (less pronounced in humans)
Circumvallate - kera epi, taste buds
Know that diff. Cells in taste buds have diff. Receptors. What is the nerve?
CN7 - Facial n.
Three major glands. Name them, and what they do.
Parotid - Large, serous secretions
Submandibular - mixed secretions, mostly serous, but some mucus
Sublingual - mixed secretions, but mostly mucus
Tell me about the parotid gland.
25% of saliva
Serous
Secretes alpha-amylase
Active during active salivation
Tell me about submandibular glands
60-67% of volume Mixed, but mostly serous Serous - amylase Mucus - mucin Active during passive salivary volume
Tell me about the sublingual glands.
3-5% of volume
Mixed, but more mucus
The mucus is capped with serous demilunes
The end product of saliva is what?
Hypotonic
Name saliva flow.
Intercalated ducts>striated ducts>interlobular ducts>excretory ducts
First 2 are collectively called the intralobar ducts b/c they collect saliva from lobules of same lobe
How are intercalated ducts organized?
Thin, simple cuboidal epi
How are striated ducts organized?
Simple columnar epi
Interlobular ducts are organized how?
Larger, and collect saliva from multiple lobes. Stratified columnar.
