Floor Of Mouth And Palate Flashcards
What is the clinical appearance of the floor of the mouth?
Reddish pink
Vascular blue in vein areas
Shiny and moist
Compressible
Which epithelium is the floor of the mouth?
Non keratinised stratified squamous epithelial tissue
What is the structure of the floor of the mouth?
- extremely thin
- overlies very vascular lamina propria that can be seen through epithelium
- loose adipose connective tissue
- sublingual and submandibular salivary glands in submucosa layer
- loosely attached to underlying muscle to allow for some movement in tongue
What is lamina propria?
Layer of gingival connective tissue that lies between epithelial layer and mucous membrane
3 muscles that support the floor of the mouth
Mylohyoid
Hyoglossus
Geniohyoid
Where does the mylohyoid muscle originate and insert?
Originates - inner surface of the mandible.
Inserts - anterior surface of the hyoid bone body.
Action of the mylohyoid muscle?
Forms floor of oral cavity, elevates floor of mouth and hyoid bone.
Assists in depressing the mandible (opening)
What nerves supply mylohyoid muscle?
Mylohyoid brand of trigeminal nerve
What supples the blood to the mylohyoid muscle?
Inferior alveolar, sublingual and sub mental arteries
Origin and insertion points for the hyoglossus muscle
Originates: superior border of the greater Cornu of hyoid bone.
Inserts: lateral borders of the tongue.
Action of the hyoglossus muscle
Depressed and retracts the tongue
Pulls lateral edges of tongue down to floor of mouth
Nerve and blood supply of the hyoglossus muscle
Hyoglossal nerve
Lingual artery
Origin and insertion of the geniohyoid muscle
Originates: inferior genial tubercle (mental spine) on lingual surface of mandible, midline.
Inserts: body of hyoid bone
Action of geniohyoid muscle
Elevates and positions the hyoid bone
Shortens floor of mouth
Widens pharynx for swallowing
Nerve and blood supply of geniohyoid muscle
Hypoglassal nerve
Lingual artery (sublingual branch)
What is the lingual frenum
Fold of tissue found in midline near base of tongue; inferior surface of tongue and connects tongue to floor of mouth.
What is the sublingual papilla
Centrally positioned protrubence near the base of tongue.
Submandibular and sublingual saliva ducts open here.
2 sublingual folds laterally either side
What are mandibular Tori
Bony swellings sublingual to premolar region.
Usually above hyoid line.