lec 1

Question 1

Muscles of the Tongue

Answer 1

palatoglossus
styloglossus
genioglossus
hyoglossus

Question 2

action of genioglossus

Answer 2

The posterior fibers protrude the tongue.

The middle fibers depress central part of tongue to enlarge mouth cavity.

The anterior fibers depress and retract tip of tongue.

Question 3

action of hyoglossus

Answer 3

Depresses side of tongue, and assists the genioglossus in the enlargement of the oral cavity.

Question 4

action of styloglossus

Answer 4

Pulls tongue upwards and backwards

Question 5

action of palatoglossus

Answer 5

Acts as sphincter at oropharyngeal isthmus, elevates the root of the tongue and narrows the transverse diameter of the isthmus by approximating the palatoglossal arches
raises a fold of mucous membrane, the palatoglossal fold or arch (anterior pillar of fauces).

Question 6

blood supply of tongue

Answer 6

Lingual artery – Branch of external carotid artery
Tonsilar artery: Branch of facial artery.
Ascending pharyngeal artery – Branch of external carotid artery

Question 7

nerve supply sensory of tongue

Answer 7

mucous membrane covering anterior two-thirds of tongue is supplied by lingual branch of the mandibular nerve.

The trigeminal component of this nerve mediates common sensibility.

The chorda tympani component mediates taste.
B.
The posterior third of tongue is supplied by glossopharyngeal nerve.

Question 8

motor supply of tongue

Answer 8

The palatoglossal muscle is supplied by pharyngeal plexus of nerves ( vagus).

The remaining muscles (intrinsic and extrinsic are innervated by hypoglossal nerve.

Question 9

lymph drainage of tongue

Answer 9

Sides of anterior 2/3 - Submandibular & Deep cervical lymph nodes.
Tip of tongue – Submental lymph nodes.
Posterior 1/3 – Deep cervical lymph nodes

Question 10

Keratinized squamous epithelium covers the

Answer 10

hard palate and dorsal surface of anterior two-thirds of tongue.

Question 11

Sensory Innervation of the Mouth

Answer 11

Roof: Greater palatine & Nasopalatine nerves – Branches of Maxillary nerve.
Floor: Lingual nerve – Branch of mandibular nerve.
Taste sensation mediated by chorda tympani –
Branch of facial nerve.
3. Cheek: Buccal nerve – Branch of mandibular nerve.

Question 12

floor of the mouth

Answer 12

genioglossus
mylohyoid
geniohyoid
anterior belly of digastric

Question 13

foramen caecum is the remains of the upper end of

Answer 13

thyroglossal duct

Question 14

anterior lingual gland type

Answer 14

mixed gland