Oral Cavity Anatomy

Question 1

what are the muscles of mastication supplied by?

Answer 1

CN V3 (3rd branch of trigeminal nerve)

Question 2

what are the 4 muscles of mastication?

Answer 2

temporalis, masseter, lateral pterygoid and medial pterygoid

Question 3

what does the lateral pterygoid do? (other muscles of mastication dont)

Answer 3

aids opening of mouth (only 1 out of 4 muscles needed as gravity helps)

Question 4

what is the superior 1/2 of the oral cavity supplied by?

Answer 4

CN V2

Question 5

what is the inferior 1/2 of the oral cavity supplied by?

Answer 5

CN V3

Question 6

what nerves supply the motor supply of the Gag Reflex?

Answer 6

CN 9 and CN 10

Question 7

what supplies the sensory nerve supply of the Gag Reflex?

Answer 7

CN 11

Question 8

what are the 3 salivary glands in the head?

Answer 8

parotid gland, sublingual gland, submandibular gland

Question 9

what supplies the parotid gland?

Answer 9

CN 9- glossopharyngeal

Question 10

what supplies the submandibular and sublingual gland?

Answer 10

CN 7- facial nerve

Question 11

what supplies the taste and general sensation in the posterior 1/3 of the tongue?

Answer 11

CN 9- Glossopharyngeal

Question 12

where is the posterior 1/3 of the tongue located?

Answer 12

oropharynx

Question 13

what supplies the taste in the anterior 2/3rds of the tongue?

Answer 13

CN VII- Facial Nerve

Question 14

what supplies the general sensory of anterior 2/3rds of the tongue?

Answer 14

CN V3- 3rd branch of trigeminal nerve

Question 15

what type of muscles of the tongue control position of tongue?

Answer 15

extrinsic muscles

Question 16

what type of muscles control size of the tongue? (shortening and lengthening)

Answer 16

intrinsic muscles

Question 17

what are the 4 intrinsic muscles of the tongue?

Answer 17

styloglossus, genioglossus, hypoglossus, palatolossus

SGHP

Question 18

what are the styloglossus, genioglossus and hypoglossus innervated by?

Answer 18

CN 12- hypoglossal nerve

Question 19

what is the palatoglossus inervated by?

Answer 19

CN 10- vagus nerve

Question 20

what are the 2 main types of muscles in the pharynx?

Answer 20

outer layer- constrictor muscles

inner layer- longitudinal muscles

Question 21

what innervates the constrictor muscles?

Answer 21

CN 10- Vagus nerve

Question 22

what innervates the longitudinal muscles?

Answer 22

CN9 and 10

glossopharyngeal and vagus nerve

Question 23

what level is the Upper Oesophageal Sphincter located?

Answer 23

C6 vertebrae

same level as thyroid

Question 24

what other than position is the difference between the upper and lower oesophageal sphincters?

Answer 24

the upper oesophageal sphincter is anatomical and the lower oesophageal sphincter is physiological

Question 25

at what level does the oesophagues enter the stomach?

Answer 25

T10

where it passes through the diaphragm and enters the stomach

Question 26

where does the IVC pass through the Diaphragm?

Answer 26

T8

Question 27

where does the Aorta pass through the diaphragm at?

Answer 27

T12