Subtopic 2 - Oral Cavity

Question 1

main musculature for prehension

Answer 1

1. zygomaticus - RETRACT angle of mouth
2. levator labil superioris - ELEVATE upper lip
3. buccinator - keep food BETWEEN teeth
4. Obicularis oris - CLOSE lips

Question 2

gutteral pouch - species and function

Answer 2

horse
thermoregulation, decrease density, increase phonation

Question 3

Hyoid apparatus 5 main bones

Answer 3

KEBST
stylohyoid
basihyoid - base
epihyoid
keratohyoid
thyrohyoid

Question 4

hyoid apparatus function

Answer 4

bone an cartilage that holds larynx in place while supporting tongue and pharynx

Question 5

4 Extrinsic tongue muscles

Answer 5

styloglossus - elevates
genioglossus - depresses
hyoglossus - retracts
geniohyoideus - forward

Question 6

conical papillae

Answer 6

mechanical
no taste buds
thick epithelium

Question 7

foliate papillae

Answer 7

gustatory
taste buds

Question 8

vallate papillae

Answer 8

gustatory
taste buds
lymphatics

Question 9

fungiform papillae

Answer 9

round
gustatory
taste buds

Question 10

filliform papillae

Answer 10

thin strips
mechanical
no taste buds

Question 11

5 types of papillae

Answer 11

CVFFF
conical
foliate
vallate
fungiform
filliform

Question 12

explain rise of embryonic germ layers to specialised tooth

Answer 12

1. oral epithelium thickens on gingival groove - forms dental lamina
2. mesenchyme under lamina condenses
3. lamina invaginates - forms dental bud
4. thickening folds on itself - forms enamel organ - forms decidious tooth
5. dental papilla form tooth
6. primordium of permanent tooth buds off dental lamina
7. inner layer of enamel differentiates into ameloblasts - forms enamel
8. cells in dental papilla differentiate into odontoblasts - forms dentine
9. dentine surrounds pulp - forms root
10. epithelial cells secrete cementum around root

Question 13

tooth eruption stages

Answer 13

1. permanent tooth migrates
2. resorption of temporary tooth
3. loosening
4. shedding