20. Oral Cavity and Pharynges (Wright) Flashcards
Explain the innervation of the tongue.
Posterior ⅓, both sensation AND taste = glossopharyngeal.
Anterior ⅔ taste = facial
Anterior ⅔ sensory = lingual (branch of the mandibular N. [branch of CN V])
Movement for the entire tongue = hypoglossal
Parasympathetic axons in what nerve stimulates parotid salivary secretions?
CN IX
Glossopharyngeal
Parasympathetic axons in what cranial nerve stimulates salivary secretion in the sublingual and submandibular gland?
Facial N
What stimulates mucus secretion from the sublingual gland?
Sympathetic fibers from the cervical ganglia.
What nerve can be found deep to the palatine tonsil?
The glossopharyngeal N.
What three muscles depress the torus tubarius and open the eustachian tube?
Superior pharyngeal constrictor.
Tensor veli palatini.
Levator veli palatini.
What happens if the tensor veli palatini or levator veli palatini are paralyzed?
What nerves innervate them?
Oral contents will reflux into the oral cavity or auditory tube dysfunction
Levator veli palatini is the laryngeal branch of the vagus N.
Tensor veli palatini is medial pterygoid (a branch of V3 — off of the trigeminal)
Describe neural control of saliva secretions
- parasympathetic axons in CN IX stimulate parotid salivary gland secretions
- parasympathetic axons in CN VII stimulate submandibular and sublingual salivary gland secretions
- Sympathetic stimulation from cervical ganglia stimulates mucus secretions
Structure/Location of Parotid
Type of secretion
Percentage of saliva
largest, anteroinferior to ear
only serous
25-30%
Structure/location of Submandibular
types of secretion
percentage of saliva
medial to mandibular angle, opens lateral to lingual frenulum
mucous and serous
60-70%
Structure and location of salivary glands
types of secretions
percentage of saliva
smallest, inferior to tongue, opens into floor of oral cavity
mucous and serous
3-5% of all saliva
What does the periodontal Ligament assist in?
maintaining health of alveolar bone. When tooth is lost, the periodontal L. is lost and leads to bone loss
glossopharyngeal nerve does what reflex?
vagal nerve does what reflex?
gag
cough/vomit
All pharyngeal constrictors innervated by what?
vagus N.
stylopharyngeus is glossopharyngeal N.