Oral Cavity Overview

Question 1

It is the area of suprahyoid neck below sinonasal region and anterior to oropharynx

Answer 1

Oral cavity

Question 2

How is oral cavity seperated from oropharynx?

Answer 2

By soft palate, anterior tonsillar pillars and circumvallate papillae

Question 3

Approach to oral cavity imaging is to consider 4 distinct regions. Which are?

Answer 3

1. Oral mucosal space/surface
2. Sublingual space (SLS): Non-fascial lined area superomedial to mylohyoid muscle
3. Submandibular space (SMS): located inferolateral to myelohyoid
4. Root of tongue: Made up of genioglossus-geniohyoid complex and lingual septum

Question 4

Oral cavity regional relationships

Answer 4

Superior: Hard palate, maxillary alveolar ridge

Lateral: Cheek-buccal space

Inferior: Mylohyoid muscle (floor of mouth), mandibular alveolar ridge and teeth

Posterior: Soft palate, anterior tonsillar pillars, and lingual tonsil (tongue base)

Question 5

Sublingual space (SLS) relationship

Answer 5

SLS in oral tongue between mylohyoid muscle inferolaterally and genioglussus medially

Question 6

Both SLS communicate anterior beneath where?

Answer 6

Frenulum

Form “horizontal horsehoe” in deep oral tongue

Question 7

Posteriorly SLS empties into where?

Answer 7

Into posterosuperior aspect of SMS and inferior parapharyngeal space

Question 8

What fascia seperates posterior SLS from SMS and inferior PPS?

Answer 8

Direct communication allows spread of disease among these 3 spaces

Question 9

It is a “vertical horseshoe” space between hyoid bone below and mylohyoid muscle sling above

Answer 9

Submandibular space

Question 10

SMS communicates posteriory with what space?

Answer 10

With inferior PPS and posterior SLS

Question 11

SMS continues inferiorly as what space?

Answer 11

Anterior cervical space

Question 12

Inferiorly, root of tongue ends where?

Answer 12

At mylohyoid sling

Question 13

Anterior, root of tongue where?

Answer 13

Mandibular symphysis

Question 14

It is the anterior 3/4 of the tongue.

Answer 14

Oral tongue

Question 15

It is the posterior 1/3 of tongue.

Answer 15

Base of tongue

Question 16

What are the deep muscles of the oral tongue?

Answer 16

Genioglossus

Geniohyoid

Question 17

Components of root of tongue?

Answer 17

Deep muscles of oral tongue (genioglossus and geniohyoid) + lingual septum

Question 18

What are the intrinsic tongue muscles.

Answer 18

Genioglossus
Hyoglossus
Styloglossus
Palatoglossus

Question 19

It is a large, fa-shaped muscle arising anteriorly from superior mental spine on inner surface of symphysis menti or mandible.

It inserts along entire length of under surface of tongue.

Answer 19

Genioglossus

Question 20

Thin and quadrilateral shaped arising from body and greater cornu of hyoid bone.

It passes vertically upward to insert into side of tongue.

Answer 20

Hyoglossus

Question 21

It forms the floor of the mouth.

Answer 21

Mylohyoid muscle

Question 22

It seperates the lower oral cavity into submandibular space and sublingual space except along posterior margin.

Answer 22

Mylohyoid muscle

Question 23

Mylohyoid muscle arises from where?

Answer 23

Mylohyoid line of the mandible

Question 24

Where is the mylohyoid cleft?

Answer 24

At the junction of anterior 1/3 and posterior 2/3 of mylohyid muscle.

The mylohyoid cleft may be prominent with fat/vessels/ accessory salivary tissue

Question 25

It lines the entire oral cavity included buccal (cheeks), gigival (gums), palatal and lingual surfaces.

Answer 25

Oral mucosal space

Question 26

Most common locations of subepithelial collections of minor salivary glands.

Answer 26

Inner surface of lip, buccal mucosa, and palatal and lingual surfaces.

Question 27

A small triangular shaped region of mucosa behind the last molar on mandibular ramus.

Answer 27

Retromolar trigone

Question 28

It is the anatomical crossroads of oral cavity, oropharynx, soft palate, buccal space, floor of mouth, masticator space, and parapharyngeal space.

Answer 28

Retromolar trigone

Question 29

Components of the sublingual space

Answer 29

1. Lingual nerve
2. Distal CN9 and CN12
3. Lingual artery and vein
4. Sublingual glands and ducts
5. Hyoglossus muscle anterior margin projects into posterior sublingual space
6. Deep portion of submandibular glan d and submandibular gland duct