Anatomy of oral cavity and tongue

Question 1

Where does the oral cavity extend from and to?

Answer 1

From the oral fissure

To the beginning of the oropharynx

Question 2

What is the oral fissure?

Answer 2

The opening between the lips

Question 3

What controls the diameter of the oral fissure?

Answer 3

Orbicularis oris muscle

Question 4

What are the parts of the oral cavity?

Answer 4

Vestibule

Oral cavity proper

Question 5

What divides the oral cavity into the vestibule and the oral cavity proper?

Answer 5

The dental arches

Question 6

What is the vestibule?

Answer 6

Space between the lips/cheeks and the gums/teeth

Question 7

What are the borders of the oral cavity proper?

Answer 7

Roof

Floor

Buccinator muscle

Question 8

What is the roof of the oral cavity proper made up of?

Answer 8

Anteriorly is hard palate

Posteriorly is soft palate

Question 9

What is the hard palate made up of?

Answer 9

Part of maxilla bone

Question 10

What is the soft palate made up of?

Answer 10

Muscle

Question 11

What is the uvula?

Answer 11

Continuation of soft palate posteriorly

Question 12

What is the floor of the oral cavity made up of?

Answer 12

Tongue

Salivary glands and ducts

Question 13

What takes up most space in the oral cavity proper?

Answer 13

The tongue

Question 14

What is the tongue made up of?

Answer 14

Muscles

Question 15

How many muscles is the tongue made up of?

Answer 15

Eight

Question 16

What are the groups of muscles that make up the tongue?

Answer 16

Intrinsic muscles

Extrinsic muscles

Question 17

How many intrinsic and extrinsic muscles make up the tongue?

Answer 17

4 intrinsic muscles

4 extrinsic muscles

Question 18

What do the intrinsic muscles of the tongue attach to?

Answer 18

Other muscles of the tongue

Question 19

What innervates the intrinsic muscles of the tongue?

Answer 19

CN12 hypoglossal nerve

Question 20

What are the extrinsic muscles of the tongue?

Answer 20

Genioglossus

Hyoglossus

Styloglossus

Palatoglossus

Question 21

What are the attachments of the hyoglossus muscle?

Answer 21

Hyoid bone

Tongue

Question 22

What are the attachments of the styloglossus muscle?

Answer 22

Styloid process

Tongue

Question 23

What are the attachments of the palatoglossus muscle?

Answer 23

Palate

Tongue

Question 24

What are the innervations of the extrinsic muscles of the tongue?

Answer 24

Genioglossus, styloglossus, hyoglossus - CN12 hypoglossal nerve

Palatoglossus - CN10 vagus nerve

Question 25

What is the sensory innervation of the tongue?

Answer 25

Anterior 2/3
general sensory - CN5 trigeminal nerve maxillary branch lingual nerve
special sensory taste - CN7 facial nerve chorda tympani

Posterior 1/3
gebneral sensory - CN9 glossopharyngeal nerve
special sensory taste - CN9 glossopharyngeal nerve

Question 26

Where does the parotid gland drain into the oral cavity?

Answer 26

Upper quadrant

near second pre-molar

Question 27

Where does the submandibular gland drain into the oral cavity?

Answer 27

Under surface of tongue

on either side of inferior franulum

Question 28

Where does the sublingual gland drain into the oral cavity?

Answer 28

Under surface of tongue

in sublingual papillae