Oral Cavity Flashcards
Which muscle is the “kissing muscle” and why is it sometimes called that?
Orbicularis oris. It is a sphincter muscle of the oral cavity which allows you to pucker up.
Which nerves innervate the roof of the mouth?
The greater & lesser palatine nerves (branches of the maxillary division of the trigeminal nerve).
Which arteries supply the roof of the mouth?
The greater & lesser palatine arteries.
Which cranial nerves innervate the muscles of the tongue?
The hypoglossal nerve innervates them all except for palatoglossus, which is innervated by vagus.
How could you test the integrity of the hypoglossal nerve?
You ask the patient to stick out their tongue. If there is a lesion on one side of the hypoglossal nerve, the tongue will stick out in that direction.
Which nerve supplies general sensory innervation to the tongue?
The glossopharyngeal nerve provides the posterior 1/3 & the lingual nerve (from the mandibular division of the trigeminal nerve) supplies the anterior 2/3.
Which nerves supply special sensory (taste) innervation to the tongue?
The glossopharyngeal nerve provides the posterior 1/3 & the chorda tympani provides the anterior 2/3.
Describe the neurovascular supply of the teeth.
The upper teeth are supplied by branches of the maxillary division of CNV; the lower teeth are supplied by branches of the mandibular division.
Where is the parotid gland located?
On the lateral side of the face, just anterior & inferior to the ear and over the ramus of the mandible. It is superficial to the masseter muscle.
Describe the pathway of the parotid duct.
It runs over the surface of the masseter muscle and opens into the vestibule opposite the upper second molar.
Where is the submandibular gland located?
It wraps around the posterior aspect of the mylohyoid muscle.
Describe the pathway of the submandibular duct.
It runs forward and opens at a sublingual papilla, just lateral to the lingual frenulum.
