510-5

Question 1

What type of epithelium is the epidermis?

Answer 1

Keritinized Stratified Squamous Epithelium

Question 2

What are the four main cells of epidermis?

Answer 2

1)Keratinocytes-MOST abundant cell of the epithelium 2)Melanocytes-pigment cells in basal layer 3)Langerhans cells (dendritic cells)-from the bone marrow, present antigens to T-cells*allergic reactions! 4)Merkel’s cells (tactile cells)-in touch with sensory neurons KNOW WHAT THEY LOOK LIKE!!

Question 3

How many layers are in thick skin and thin skin respectively?

Answer 3

Thick skin 400-600m layers thick (no hair), thin skin is ~ 75-150m thick (hair present)

Question 4

Is epidermis vasular? innervated?

Answer 4

It is avascular and not innervated

Question 5

Name the 5 strata of the epidermis from superficial to deep.

Answer 5

(((C-L-G-S-B))) 1)Stratum Corneum 2)Stratum Lucidum 3)Stratum Granulosum 4)Stratum Spinosum 5)Stratum Basale

Question 6

What is the skeletal muscle of the lips?

Answer 6

Orbicularis Oris

Question 7

What are the 4 glands of the lips?

Answer 7

1)salivary 2)mucous 3)sweat 4)sebaceous

Question 8

What are the 3 distinct types of stratified squamous epithelia of the lips?

Answer 8

1)Thin&Hairy-Keratinized W Hair and Glands 2)Vermillion zone-Keratinized WITHOUT hair or glands 3)Oral mucosa-nonkeratinized OR parakeratinized epithelium with glands

Question 9

What is Meissner’s Corupuscle? Where can I find one?

Answer 9

Its a nerve ending in the Vermillion zone of the lip. Makes lips perfect for kissing! and feeling things I guess.

Question 10

What marks the junction between labial mucosa and the vermillion zone?

Answer 10

minor salivary glands! think: dry vermillion zone and wet labial mucosa

Question 11

Since the oral mucosa is BOTH nonkeritinized and parakeratinized, what about the nuclei distinguishes parkeratinized cells?

Answer 11

The nuclei of parakeratinized cells are PYKNOTIC-dark and shrunken-nuclei.

Question 12

What are the three layers of MUCOSA?

Answer 12

1)Stratified Squamous Epithelium 2)Lamina Propria 3)Muscularis mucosae

Question 13

What features of the 3 mucosal layers distinguish ORAL mucosa from other mucosa?

Answer 13

EPITHELIUM:degrees of keratinization, based on type IV collagen LAMINA PROPRIA: RETE RIDGES, fibroblasts MUSCULARIS MUCOSAE:the oral mucosa has NO muscular is mucosae (we keep things moving enough with saliva!)

Question 14

What three things can I find in the loose CT of the oral submucosa?

Answer 14

blood vessels, nerves, & minor salivary glands

Question 15

The THREE types of ORAL CAVITY Mucosae!!!

Answer 15

Lining Mucosa, Masticatory Mucosa, Specialized

Question 16

Where can I find Masticatory and Specialized mucosa?

Answer 16

Masticatory: Gingiva and hard palate Specialized: dorsal surface of tongue LINING is the rest! (alveolar mucosa, labial mucosa, buccal mucosa, soft palate, floor of the mouth, surface of the tongue)

Question 17

What type of epithelium is lining mucosa?

Answer 17

NONkeratinized stratified squamous epithelium

Question 18

What is the lining mucosa supported by?

Answer 18

Vascular lamina propria-FEW papillae(so its mobile!)

Question 19

Is the lining mucosa permeable?

Answer 19

Yes, think: topical anesthetic, nitroglycerin, vitamin B12, and tobacco

Question 20

What is a down growth of epithelium into the lamina propria?

Answer 20

A Rete Ridge! (interdigitated with papilla of the lamina propria)

Question 21

What are the four layers of the masticatory mucosa epithelium?

Answer 21

S. Basale-Hemidesmosomes; S. Spinosum-desmosomes; S. Granulosum-keratin granules; S. Corneum-keratinized and parakeratinized

Question 22

What are clusters of sebaceous granules in the oral mucosa? (Not all people have these..)

Answer 22

Fordyce’s granules

Question 23

What are the 5 parts of the GINGIVA?

Answer 23

1)Attached-to periosteum of the alveolar bone 2)Free-on the Crest of the alveolus 3)Gingival Margin/Crest-gingiva at the apex of the free gingiva(over the crest of the alveolus) 4)Sulcar epithelium-lines the gingival sulcus 5)Junctional Epithelium-2 basal laminae

Question 24

How does Junctional epithelium connect gingiva to tooth? WHO characterized this phenomena?

Answer 24

2 basal laminae- one to the ENAMEL (Internal Basal Lamina) and one to the connective tissue around the alveolar bone (normal Basal Lamina). Good ole Bernhard GOTTLIEB!!

Question 25

What are the two types of epithelium in the gingival sulcus?

Answer 25

1)Sulcular epithelium and 2)junctional epithelium

Question 26

How do melanocytes transfer melanin to keratinocytes? Where are melanocytes embryologically derived from?

Answer 26

Via CYTOCRINE injection. Neural Crest Cells.

Question 27

Preview: what type of oral mucosa lines the dorsal side of the tongue? Is it keratinized or nonkeratinized?

Answer 27

It is SPECIALIZED oral mucosa and it is KERATINIZED.