Oral Cavity

Question 1

Label this

Answer 1

Frenulum = attaches to the upper lip and also one under the tongue
Anterior folds = palatoglossal arches
Posterior folds = palatopharyngeal arches

These arches are created by muscles of the palate that pass to the tongue and pharynx.

The fauces is another name for the opening of the oral cavity (mouth).

Question 2

Lateral walls of oral cavity formed by?

Answer 2

Buccinator

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

Question 6

Answer 6

Question 7

Which muscle forms a diaphragm in the floor of the mouth?

Anatomical relations?

Answer 7

Mylohyoid

Inferior = anterior belly of digastric (in ant. triangle of neck)
Superior = geniohyoid (inside mouth)

Question 8

Attachments of mylohyoid, geniohyoid + genioglossus?

Answer 8

(Genio = mandible, glossus = tongue)

Mylohyoid = mylohyoid line of mandible
Geniohyoid = inferior genial tubercle of mandible
Geioglossus = superior genial tubercle

Question 9

Supra-hyoid muscles?

Function?

Answer 9

Mylohyoid, digastric, stylohyoid + geniohyoid

Elevate the hyoid bone

Question 10

Label

Answer 10

Question 11

Innervation of supra-hyoid muscles?

Answer 11

Post. belly of digastric + stylohyoid = facial nerve (post belly attaches to mastoid process + stylohyoid attaches to styloid process so sit either side of stylomastoid foramen from which facial nerve exits skull)

Mylohyoid + ant. belly digastric = mandibular division of trigeminal (CN V3)

Geniohyoid is odd one out = receives innervation from C1 nerves carried in hypoglossal nerve

Question 12

Label

Answer 12

Question 13

Label

Answer 13

Question 14

Answer 14

This slide shows the relation between the submandibular duct and the lingual nerve (superior then passes inferior) and the hypoglossal nerve (inferior).

The lingual nerve is a branch of the mandibular division of the trigeminal nerve that supplies sensory innervation to the anterior 2/3rds of the tongue, and carries taste and parasympathetic fibres from the facial nerve. The hypoglossal nerve is the main motor supply to the tongue musculature

Question 15

largest papillae? useful?

why is posterior 1/3 bumpy?

Answer 15

The largest papillae form a line 2/3rds of the way along the tongue – they are the vallate papillae
. This line of papillae can act as an approximate guide to whether you are observing the anterior 2/3rds of the tongue or the posterior 1/3rd

bumpy appearance due to the presence of the lingual tonsil which is embedded into this part of the tongue

Question 16

special sense?

Answer 16

Special sense of taste to the anterior 2/3rds is carried to the tongue within the lingual nerve but the fibres originate in the facial nerve. The chorda tympani branch of the facial nerve carries these fibres and joins the lingual nerve in the infratemporal fossa

Question 17

intrinsic muscles of tongue function?

innervation?

Answer 17

Change the shape of the tongue

Hypoglossal nerve CN XII

Question 18

extrinsic muscles tongue?
function
innervation?

Answer 18

Question 19

blood supply tongue?

Answer 19

lingual artery - 2nd branch of external carotid

It is crossed by the hypoglossal nerve, passes under hyoglossus and enters the floor of the mouth. It supplies the floor of the mouth, the extrinsic muscles and sends a deep branch into the body of the tongue

Question 20

venous drainage tongue?

Answer 20

lingual vein –> internal jugular vein

Question 21

Answer 21

…

Question 22

Answer 22

Lingual nerve descending to the tongue from the infratemporal fossa, whereas the hypoglossal nerve passes from the hypoglossal canal at the base of the skull and passes over hyoglossus but under mylohyoid to enter the floor of the mouth

Question 23

lymphatic drainage tongue

Answer 23

The tip of the tongue drains into nodes under the chin (submental).

The lateral edges of the tongue pass lymph into nodes around the submandibular salivary gland (submandibular).

The central and posterior parts of the tongue drain to deep nodes in the neck (deep cervical).