Anatomy Of Oral Cavity

Question 1

What separates the oral cavity into 2 regions

Answer 1

Upper and lower dental arches

Question 2

Name muscles forming floor of mouth

Answer 2

Mylohyoid, geniohyoid and tongue

Question 3

What is the origin and insertion and function as well as innervation of mylohyoid muscle FFQ

Answer 3

0:Mylohyoid line on mandible
I: medially- fibrous raphe, as well as hyoid bone
A: provide structural support to the floor of oral cavity, participates in the elevation and pulling forward the hyoid bone and therefore the larynxin the
Initial stages of swallowing
In: A branch of inferior alveolar nerve - the nerve to mylohyoid

Question 4

FFQ geniohyoid muscle origin, insertion, action and innervation

Answer 4

0: inferior mental spines of mandible
I: body of hyoid bone
A: pull hyoid bone and therefore the larynx up and forward during swallowing
In:

Question 5

What is the lateral walls of the oral cavity?

Answer 5

• Cheeks→ muscular and merge anteriorly with the lips surrounding, the oral fissure
• each cheek → consist a layer of skeletal muscle sandwiched between skin externally and oral mucosa internally→Buccinator muscle

Question 6

FFQ origin, insertion etc of Buccinator muscle

Answer 6

0: Pterigoid raphe, alveolar processes of Maxillar and mandible
I: orbicularis oris
A: to hold cheeks againts alveolar arches to keep food between the teeth when chewing
In: buccal branch of facial nerve, sensation from buccal branch trigerminal nerve of mandibular part

Question 7

Name the parts of the posterior Aperture of the tongue

Answer 7

1. Orophargngeal isthmus

2. Opens into the oral part of the pharynx (oropharynx)

Question 8

Namer functions of the tongue

Answer 8

= speech
= taste
=mastication
=swallowing

Question 9

What part of the tongue is fixed and what is mobile

Answer 9

Mobile # anterior 2/3

Fixed # Posterior 1/3 - forms anterior border of oropharynx

Question 10

Name the papillae of the Tongue

Answer 10

# Circumvallate papillae
# Filiform papilla
# Foliate papilla
# Fungiform papilla

Question 11

Does the pharyngeal surface of the tongue have - papillae

Answer 11

No

Question 12

Explain the pharyngeal surface of the tongue

Answer 12

The mucosa covering the pharyngeal surface of the tongue is irregular in contour because of the many small nodules of lymphoid tissue = lingual tonsil

Question 13

Namer the extrinsic muscles of the tongue

Answer 13

• Palatoglossus
• Styloglossus
• Hyoglossus
• Genioglossus

Question 14

Namer the intrinsic muscles of the tongue

Answer 14

• Longitudinal
• transverse
• vertical

Question 15

What is the blood supply of the tongue

Answer 15

• lingual artery (branch of external carotid artery)

Question 16

What is the venous drainage of the tongue

Answer 16

Drains to internal jugular vein

Question 17

What is the motor innervation of the tongue

Answer 17

All tongue muscles innovated by hypoglossal nerve (except palatoglossus muscle)

Question 18

What gives sensory (pain and temp) innovation to tongue

Answer 18

Anterior 2/3= lingual nerve (branch o t V3)

Posterior 1/3= glossophargeus nerve

Question 19

What provides sensory (taste) inneruation to tongue

Answer 19

Anterior 2/3= facial nerve

Posterior 1/3= glossophargngeus nerve

Question 20

What is the course of the lingual nerve FFQ (part I)

Answer 20

Remember the lingual nerve is a sensory branch of the posterior division of the mandible division of the trigeminal nerve
→ the lingual nerve divides off the posterior division and descends anterior to the inferior alveolar nerve to course between the lateral pterygoid and tensor
Veli palatine muscles and then medial pterygoid muscle and the mandible, contracting the internal surface of the mandible at the posterior margin of the
Mylohyoid line.

Question 21

Course of lingual nerve part (2)

Answer 21

→ running anteriorly it passes lateral to the styloglossus and hyoglossus muscles and has small sensory branches that supply the floor of the mouth and the mandibular lingual gingival.

Question 22

Courser of lingual nerve (part 3)

Answer 22

The nerve continues anteriorly passing from lateral to medial under the submandibular duct and then enters the lateral margin of the mid tongue to supply sensation to the anterior two-thirds of the tongue