Anatomy W8 - Floor of the mouth

Question 1

What salivary glands are found in the floor of the mouth?

Answer 1

The submandibular and sublingual salivary glands

Question 2

What kind of secretions does the submandibular salivary gland produce?

Answer 2

A seromuco gland

Question 3

How does the submandibular gland communicate with the floor of the mouth?

Answer 3

Via the submandibular salivary duct which opens on to the floor of the mouth via the sublingual papilla.

Question 4

Describe the course of the submandibular salivary duct, what problems does this cause clinically?

Answer 4

The duct runs slightly uphill = predisposes it to salivary calculi since the flow slows as it goes uphill.

Question 5

How many sublingual papilla are there?

Answer 5

2 - one on each side of the lingual frenulum corresponding to the left and right submandibular ducts.

Question 6

What kind of secretions does the sublingual salivary gland produce?

Answer 6

Mucous

Question 7

Describe the ducts of the sublingual gland.

Answer 7

Has many ducts

Some open up on to the end of the submandibular duct
Some open up on to the floor of the mouth at the sublingual fold.

Question 8

Describe the lingual nerves position in relation to the submandibular duct.

Answer 8

The lingual nerve curves under the submandibular salivary duct.

Question 9

List the extrinsic muscles of the tongue.

Answer 9

Hyoglossus
Styloglossus
Palatoglossus
Genioglossus

Question 10

What type of muscle are the extrinsic muscles of the tongue?

Answer 10

Skeletal muscle - voluntary control

Question 11

What is the function of the hyoglossus muscle?

Answer 11

Pulls the tongue down/depresses

Question 12

What is the function of the styloglossus muscle?

Answer 12

Pulls tongue upwards and backwards

Question 13

What is the function of the palatoglossus muscle?

Answer 13

Pulls the soft palate down

Question 14

What is the function of the genioglossus muscle?

Answer 14

Protrudes the tongue

Question 15

What extrinsic muscle(s) of the tongue are supplied by the hypoglossal nerve?

Answer 15

The genioglossus
The styloglossus
The hyoglossus

Question 16

What extrinsic muscle(s) of the tongue are supplied by the vagus nerve?

Answer 16

The palatoglossus

Question 17

What type of muscle are the intrinsic muscles of the tongue?

Answer 17

Skeletal - voluntary

Question 18

What nerve innervates the intrinsic muscles of the tongue?

Answer 18

The hypoglossal nerve

Question 19

Name the intrinsic muscles of the tongue.

Answer 19

The superior and inferior longitudinal muscles

The vertical muscles

The transverse muscles

Question 20

What is the function of the superior and inferior longitudinal intrinsic muscles?

Answer 20

They pull the tip of the tongue back to curl the tongue

Question 21

What is the function of the vertcal intrinsic muscles?

Answer 21

Make the tongue thin by flattening it

Question 22

What is the function of the transverse muscles?

Answer 22

Pull the sides of the tongue in

Question 23

What is the function of the extrinsic muscles of the tongue?

Answer 23

Change position of the tongue

Question 24

What is the function of the Intrinsic muscles of the tongue?

Answer 24

Change shape and position of the tongue

Question 25

What is the function of the GenioHYOID? (not a muscle of the tongue)

Answer 25

Used in swallowing - pulls the hyoid bone forward to create space in the pharynx

Question 26

Name the 2 heads of the submandibular salivary gland.

Answer 26

The superficial head
The deep head - located on the floor of the mouth.

Question 27

What muscle in the submandibular region does the submandibular salivary gland wrap around?

Answer 27

The mylohyoid

Question 28

What branch of the external carotid artery makes a groove in the submandibular gland?

Answer 28

The facial artery

Question 29

If there was damage to the hypoglossal nerve on one side, what would the patient present with?

Answer 29

A tongue that deviated to one side (the deviated side would be the affected side)

Question 30

Describe the lingual nerves secretomotor function to the submandibular and sublingual salivary glands.

Answer 30

The preganglionic parasympathetic fibres leave the superior salivatory nucleus in the pons of the brainstem via the facial nerve

The chorda tympani then carries the information from the facial nerve to the lingual nerve.

The fibres then enter the submandibular ganglion via the lingual nerve and synapse.

(submandibualr ganglion controls both glands)