Oral Cavity Flashcards
What are the 2 parts of the oral cavity?
- Vestibule
2. Oral cavity proper
What is the vestibule?
An oral fissure between the lips
Where is the vestibule located?
Behind the lips and cheeks and in front of teeth and gums.
What do the cheeks consist of? (6)
- Mucous membrane
- Small buccal salivary glands
- Skeletal muscle (buccinator)
- Buccal fat pad
- Some of the muscles of facial expression
- Skin
Where is the buccinator?
From outer surfaces of mandible and maxilla, and pterygomandibular raphe to modiolus
What is the anterolateral boundary of the oral cavity proper?
Alveolar arches/processes of maxilla and mandible
What is the posterior boundary of the oral cavity proper?
Oropharangeal isthmus/fauces bounded laterally palatoglossal folds
What do the palatoglossal folds contain?
Palatoglossal muscle
Where do the palatoglossal folds extend?
From soft palate to posterolateral tongue
Where are the palatopharangeal folds located?
Behind palatoglossal folds with the palatine tonsils in between.
Where do the palatopharangeal folds extend? What do they contain?
Extend from palate to thyroid lamina and contain palatopharangeal muscle
What is the roof of the oral cavity proper?
Hard palate and soft palate
Waht is the hard palate comprised of?
Palatine process of maxilla and horizontal plate of palatine bone
What is the floor of the oral cavity proper? (3)
- Tongue
- Alveolar lingual sulcus (under tongue)
- Mylohyoid muscle
The tongue is partly oral and partly pharyngeal in position. True or false
True
What special about the root of the tongue?
It is where external muscles attach tongue to surrounding structures/
What is the dorsum (upper surface) part of the tongue comprised of?
Palatine (oral) and pharyngeal parts with sulcus terminalis and foramen caecum in between
What are the 4 parts of the palatine part of the tongue?
- Dorsal surface
- Alveolar lingular sulcus
- Ventral surface
- Sides
What does the dorsal surface (upper surface) consist of?
Fungiform and filiform lingual papilla, 7-12 vallate papilla
Where are taste buds located?
They are located on fungiform, vallate and foliate as well as in the lining of the oral cavity (none on filiform)
What is the alveolar lingual sulcus?
The horseshoe shaped cavity which wraps around the attachment of the tongue to the floor of the mouth (“root” of tongue)
What does the alveolar lingual sulcus contain?
Sublingual folds
Sublingual salivary glands are deep to the alveolar sulcus. True or false?
True
What does the ventral surface (lower surface) consist of?
- Frenulum in midline
- Deep lingual veins lateral to frenulum and fimbriated folds lateral to veins
- Sublingual folds and openings of sublingual ducts
- Sublingual papillae at base of frenulum and openings of submandibular ducts
What do the sides of the palatine part consist of?
Approx 5 foliate papillae on each side
Where is the pharyngeal part of the tongue?
From just posterior to vallate papillae to epiglottis
What does the pharyngeal part of the tongue consist of?
- Valleculae and median and lateral glossoepiglottic folds
2. Lingual tonsils
What are the two types of muscles in the tongue?
- Intrinsic
2. Extrinsic
What are the intrinsic muscles responsible for? What are the types of intrinsic muscles?
Change shape of tongue
Superior and inferior longitudinal; vertical and transcerse
What are the extrinsic muscles of the tongue responsible for? What are the 4 extrinsic muscles?
Move tongue
- Genioglossus
- Hyoglossus
- Styloglossus
- Palatoglossus
Where does the genioglossus extend? What action is it responsible for?
Mental spine to tongue
Protrusion
Where does hyoglossus extend? What action is it responsible for?
Hyoid to side of tongue
Depresses side of tongue, sucking
Where does the styloglossus extend? What action is it responsible for?
Styloid process to side of tongue
Tongue up and back during swallowing
What action is the palatoglossus responsible for?
Elevates tongue, narrows isthmus
What is the blood supply to the tongue?
Lingual artery
Lingual vein
What is the lingual artery a branch of?
External carotid
What is the lingual vein a tributary of?
Internal jugular
What are the nerves of tongue? What do they innervate?
Complex. It relates to the origin of the tongue from four separate pharyngeal arches in embryo
- Anterior/oral tongue
- Posterior/pharangeal tongue
- Intrinsic and extrinsic muscle
- Intrinsic salivary glands
- Blood vessels
What does each pharyngeal arch have?
Its own cranial nerve and adult structures derived from a particular arch also have that innervation