Histo - Oral Cavity

Question 1

What are the 4 Main Functions of the Oral Cavity?

Answer 1

1. Phonation
2. Ingestion, mastication
3. Digestion of carbs & lipids starts
4. Immune function
   
   • saliva contains IgA from PLASMA CELLS

Question 2

What is this?

Answer 2

Lips

3 Different Surfaces:

1. Exterior (cutaneous; thin skin)
   
   • SSK
   • Hair, sweat glands, sebaceous glands
2. Vermillion border (Red region)
   
   • thin skin w/ capillary tufts
   • no hair, no glands
3. Interior (oral mucosa)
   
   • SSNK

Question 3

What are the type of papillae on tongue?

Answer 3

1. Filiform
   
   1. pointed
   2. NO TASTE BUDs
   3. scattered over dorsal surface
   4. cause roughness
2. Fungiform
   
   1. TASTE BUDS
   2. mushroom shaped
   3. dorsal & lateral surface
   4. red-dots on tongue surface
3. Circumvallate (Vallate)
   
   1. LATERAL TASTE BUDS
   2. anterior to sulcus terminalis
   3. deep moats
      
      1. Von Ebner’s glands (serous salivary glands) open into base of moats
4. Foliate
   
   1. LATERAL TASTE BUDS
   2. peglike, but similar to vallate
   3. best dev in children

Question 4

What is this?

Answer 4

Papillae

1. Filiform - NO TASTE BUDS (pointed)
2. Fungiform
3. Circumvallate (Vallate)
4. Foliate

Question 5

What is this?

Answer 5

Foliate Papillae

Question 6

What is this? What is associated with this?

Answer 6

Serous salivary glands are associated
with foliate papilla

Question 7

What is this?

Answer 7

Tongue

• Skeletal Muscle
  
  • intrinsic = change shape
  • extrinsic = movement
• Multiple orientations of tongue

Question 8

What is this?

Answer 8

Taste Buds

• Barrel shaped
• Openings = TASTE PORE
  
  • ​connect to CNS
• Cells
  
  • taste receptors = GUSTATORY CELLS
    
    • microvilli that go towards takes pore
  • supporting cells
  • immature cells
  • stem cells/basal cells
• Tastes dissolve into saliva & contact the microvilli to interact w/ taste receptors
  
  1. ​sweet
  2. sour (acid)
  3. bitter (alkaloids)
  4. salty
  5. umami (AAs)

Question 9

How many teeth do we have as children vs. adults?

Answer 9

20 - children / 32 - adults

Components to teeth:

• Crown
  
  • covered by enamel
• Neck
  
  • enamel + cementum come together
• Root
  
  • covered w/ cementum
• Dentin + Pulp cavity
  
  • sockets in jaw
  • Pulp = CT in center of tooth + Blood vessels + nerves
    
    • enter via APICAL foramen
• Peridonatal ligaments
  
  • hold tooth –> jaw (SHARPEY’S FIBERS)
    
    • type I collagen

NOTE:

• Scurvy = loss of peridontal ligamnets
  
  • loss of collagen due to lack of VIT C

Question 10

What are the 3 types of cells in the tooth?

Answer 10

1. Ameloblasts (lose this as ADULT)
   
   • from ECTODERM
   • make ENAMEL (90% of tooth)
   • CANNOT BE REPLACED
2. Cementoblasts
   
   • from CRANIAL NEURAL CREST (ectomesenchyme)
   • make CEMENTUM (45%)
3. Odontoblasts
   
   • from CRANIAL NEURAL CREST (ectomesenchyme)
   • make DENTIN (60-70%)
   • DONT DIVIDE
   • nerve fibers run in dentin tubules
     
     • cause pain sensation

Question 11

What is this?

Answer 11

Root Canal & Implant

Question 12

What is this?

Answer 12

Developing Head & Teeth!!

Question 13

What is happening in this pic?

Answer 13

Developing Tooth

Cell Fates:

1. Inner enamel (dental ) epithelium
   
   • becomes AMELOBLASTS
   • die when tooth erupts
2. Outer enamel (dental) epithelium
   
   • lost when tooth erupts
3. Cells in primitive dental papilla adjacent to inner enamel
   
   • become ODONTOBLASTS
4. Stellate reticulum
   
   • Lost when tooth erupts

Question 14

What is this?

Answer 14

Tooth:

Dental Lamina from Oral Ectoderm & Bud of the Permanent
Tooth

Question 15

What are the layers in this image?

Answer 15

1. Ameloblasts
2. Enamel
   
   • basophilic
3. Odontoblasts
4. Dentin
   
   • eosinophilic

Question 16

What is this?

Answer 16

Ameloblasts

Question 17

What is this?

Answer 17

Odontoblasts and Dentinal Tubules

Question 18

What is this?

Answer 18

Periodontium
Holds teeth to jaw bones and gingiva

Question 19

What is this?

Answer 19

Sharpey’s Fibers

Question 20

What is this?

Answer 20

Parotid Salivary Gland

• Serous acini
  
  • ALL dark/basophilic gland things

Question 21

What is this?

Answer 21

Submandibular Salivary Gland

• Mixed type!
  
  • Mucous (eosinophilic)
  • Serous acini (basophilic)

Question 22

What is this?

Answer 22

Sublingual Salivary Gland

• ​ALL Mucous cells
  
  • some serous demilunes
    
    • ​due to swelling of mucous cells

Question 23

What is left vs. right image?

Answer 23

Question 24

What is this?

Answer 24

Parotid Gland

• All serous acini
  
  • secretes = AMYLASE granules

Question 25

What is this?

Answer 25

Serous and Mucous Cells

• Mixed acinar cells
  
  • most likely = SUBMANDIBULAR

Question 26

What are the 3 types of cells in Salivary Gland Ducts?

Answer 26

1. Intercalated (within lobule)
   
   • secrete bicarnate + IgA + lysosomes
2. Striated (within lobule)
   
   • apical round nucei
   • basal striations
   • reabsorption of Na / Cl-
   • excretion of K+
3. Excretory (outside lobule)
   
   • ​transport saliva

NO CENTRAL ACINAR CELL