Anatomy of the Upper GI Tract

Question 1

Where does jaw opening occur?

Answer 1

TMJ (temporomandibular joint)

Question 2

What are the 3 pairs of jaw closing muscles?

Answer 2

Masseter
Temporalis
Medial Pterygoid

Question 3

What is the pair of jaw opening muscles?

Answer 3

Lateral Pterygoid

Question 4

What supplies the muscles of the jaw?

Answer 4

Mandibular division of trigeminal nerve

Question 5

Course of the CNV3

Answer 5

pons->foramen ovale-> muscles of mastication and sensory area

Question 6

Teeth 1+2

Answer 6

incisor

Question 7

Tooth 3

Answer 7

canine

Question 8

Teeth 4+5

Answer 8

premolars

Question 9

Teeth 6, 7+8

Answer 9

molars

Question 10

3 pairs of salivary glands

Answer 10

parotid, submandibular, sublingual

Question 11

what nerve is responsible general sensation in the superior half of the mouth?

Answer 11

CN V2

Question 12

what nerve is responsible general sensation in the inferior half of the mouth?

Answer 12

CN V3

Question 13

Course of CN V2

Answer 13

pons-> foramen rotunda-> sensory area (midface)

Question 14

nerve fibres responsible for sensory part of gag reflex

Answer 14

CN IX

Question 15

nerve fibres responsible for motor part of gag reflex

Answer 15

CN IX and CN X

Question 16

What effect does spraying local anaesthetic have on sensory action potentials?

Answer 16

It blocks sensory action potentials in CN V2, CN V3, CN VII and CN IX