W2: S7 - Oral Cavity, Palate and Oropharynx Flashcards
What is the oral vestibule?
The space between the teeth and the cheeks
What is the name of the muscle that lies in the lateral walls of the oral cavity?
Buccinator
What is the nerve supply of the buccinator?
Facial
What muscle’s contraction causes closing/pursing of the lips?
Obicularis oris
What is the name of the posterior opening of the oral cavity?
Oropharyngeal isthmus
What are the functions of the tongue?
Moving food during chewing
Speech
Initiation of swallowing
What is the name given to the v-shaped sulcus that divides the tongue into an anterior 2/3rds and posterior 1/3rd?
Terminal sulcus
What is the foramen caecum an embryological artefact of?
It’s the site of formation and descension of the thyroglossal duct
What are the 4 types of papillae on the anterior tongue?
Filiform
Fungiform
Valate
Follate
Which of the three anterior tongue papillae have tastebuds?
Fungiform
Valate
What forms the surface projections of the posterior 1/3rd of the tongue?
Submucosal lymphoid tissue
- Lingual tonsil
What lines the inferior surface of the tongue?
Smooth mucous membrane
What is the name of the fold of mucous membrane that fixes the tongue to the floor of the mouth?
Frenulum
What is the general sensory innervation of the anterior 2/3rds of the tongue?
Mandibular V3
What is the taste sensation of the anterior 2/3rds of the tongue?
Chorda tympani branch of facial
What is the general sensory innervation of the posterior 1/3rds of the tongue?
Glossopharyngeal nerve
What is the taste sensation of the posterior 2/3rds of the tongue?
Glossopharyngeal nerve
What are the two types of muscles of the tongue?
Intrinsic
Extrinsic
What is the definition of the intrinsic muscles?
Originate and insert inside the tongue
What is the definition of extrinsic muscles of the tongue?
Muscles that attach to the tongue from surrounding bone or the soft palate
Where are the intrinsic muscles mainly concentrated?
The dorsal surface
What is the collective function of the intrinsic muscles?
Change the shape of the tongue
Name the 4 extrinsic muscles of the tongue
- Genioglossus
- Hyoglossus
- Styloglossus
- Palatoglossus
Identify the extrinsic muscles of the tongue
n.b. palatoglossus is not there
What nerve innervates all the intrinsic and extrinsic muscles of the tongue except the palatoglossus?
Hypoglossal nerve
What nerve innervates the palatoglossus?
Glossopharyngeal nerve
What are the 3 main salivary glands?
- Parotid
- Submandibular
- Sublingual
What artery grooves the undersurface of the submandibular gland?
Facial artery
What type of innervation do the cranial nerves give the salivary gland?
Parasympathetic
What nerve supplies the parotid gland with parasympathetic innervation?
Glossopharyngeal
What nerve supplies the submandibular gland with parasympathetic innervation?
Chorda tympani branch of facial
What nerve supplies the sublingual glands with parasympathetic innervation?
Chorda tympani branch of facial
Name the 5 muscles of the soft palate?
Tensor veli palatini
Levator veli palatini
Muscularis uvula
Palatopharyngeus
Palatoglossus
What nerve supplies all the muscles of the soft palate?
Vagus
What is the collective action of the palate muscles?
Closing the nasal passage during swallowing by raising the throat
A - Palatoglossal fold
B - Palatopharyngeal fold
C - Oropharynx
D - Frenulum
E - Opening for submandibular and sublingual glands
F - Palatine tonsils
G - Uvula
What structure lies between the two folds of mucosa overlying the palatoglossus and palatopharyngeus muscles?
Palatine tonsils
What type of tissue makes up the palatine tonsils?
Lymphoid
