Histo

Question 1

Types of mucosa in the mouth?

Answer 1

1. Masticatory mucosa (ectoderm): gingiva, hard palate
2. Specialized mucosa (endoderm): dorsal tongue
3. Oral mucosa proper (ectoderm): lining of mouth (cheeks, ventral tongue)
4. Submucosa: connective tissue, salivary glands, adipose tissue, blood vessels and lymphatics

Question 2

Is the mouth epithelium keratinized as the skin?

Answer 2

No, it is stratified squamous non-keratinized

Question 3

4 types of specialized lingual papillae in the tongue?

Answer 3

1. filiform: middle, cup shape, most abundant
2. fungiform, taste buds, tip of tongue
3. cicumvallate: V shape, posterior, many taste buds
4. foliate: not always there, taste buds

Question 4

The 5 primary taste sensations and their mechanism of transmission?

Answer 4

1. bitter (G-protein coupled)
2. sweet (G-protein coupled)
3. umami (G-protein coupled)
4. sour (proton channel)
5. salty (sodium channel)

Question 5

Major salivary glands?

Answer 5

1. Parotid (on TMJ): serous + amylase
2. Submandibular: 60%, serous
3. Sublingual gland: small, mucous with serous demi-lunes glands