Digestive System.3

Question 1

Decidous dentition-

Answer 1

milk/ temp teeth

Question 2

DD- Dogs

Answer 2

Incisors-3/4 weeks
canines- 5 weeks
premolars- 4-8 weeks
molars- absent

Question 3

DD- Cats

Answer 3

ALL teeth begin eruption at 2 weeks- complete at 4

Question 4

Permanent Dentition-

Answer 4

adult teeth

Question 5

PD Stages- Dogs

Answer 5

Incisors- 3.5/4 months
canines- 5-6 months
premolars- 4-7 months
molars- 5-7 months

Question 6

PD Stages- Cats

Answer 6

incisors- 12 weeks
canines- variable full dentition present, 6 months

Question 7

What are the different tooth types?

Answer 7

Incisor I
Canines C
Premolars PM
Carnassials

Question 8

Incisor I-

Answer 8

lies in incisive bone upper jaw and mandible lower
nibble/ grooming

Question 9

Canines C-

Answer 9

each corner of upper/ lower jaw- varied point/simple curved shape- single root
holding prey/ piercing

Question 10

Premolars PM-

Answer 10

flatter surface, several points (cusps)- 3-4 roots
shearing/ grinding meat

Question 11

Carnassials-

Answer 11

largest teeth, first lower molar/ last upper pre molar
carnivores, right angle- slicing meat/ fibrous structures

Question 12

What does the pharynx connect?

Answer 12

nasal and oral cavity with trachea, larynx and oesophagus

Question 13

What divides the pharynx?

Answer 13

nasopharynx and oropharynx

Question 14

Epiglottis-

Answer 14

tissue flap, contains cartilage- covers larynx during swallowing

Question 15

What is deglutition?

Answer 15

swallowing

Question 16

How does swallowing occur?

Answer 16

food passed from tongue, back of mouth
pharyngeal muscles contract- food to oesophagus
epiglottis closes- prevents food entering larynx
peristalsis occurs
epiglottis opens- respiration starts

Question 17

Oesphagus-

Answer 17

tube carries food from pharynx to stomach- peristalsis

Question 18

Where does the oesophagus lie?

Answer 18

dorsal to trachea- left
enters abdominal cavity- oesophageal hiatus of diaphragm

Question 19

WHat are the 4 layers of the oesophagus?

Answer 19

serosa- connective tissue
muscle layer
submucosa
musosa

Question 20

Serosa-

Answer 20

connective tissue, outer layer

Question 21

Muscle layer-

Answer 21

striated muscle- smooth distally, inner circular/ outer longitudinal

Question 22

Mucosa-

Answer 22

stratified squamous epithelium