Oral Cavity Flashcards
What is Ludwig’s Angina?
Infection of the floor of the mouth, often due to spread from abscessed mandibular tooth; infection may obstruct airway, push up tongue
Where is the submandibular region?
Area between mandible and hyoid bone
What are the functions of the tongue?
Chewing food, speech, swallowing, taste
What does a protruded tongue indicate?
LMN lesion of CN XII
Deviates toward the side of the lesion due to unopposed action of the genioglossus muscle
Which cranial nerves are only contralateral when concerning UMN lesions?
VII - lower face
XII - genioglossus
XI- trapezius
Which cranial nerve presents only ipsilateral when concerning an UMN lesion?
XI - sternocleidomastoid
What are the branches of the lingual artery?
Dorsal lingual branches - to dorsum of tongue
Sublingual artery - to sublingual salivary gland
Describe the lymphatics of the tongue.
Tip of the tongue - submental nodes
Rest of anterior 2/3 of tongue - submandibular nodes and deep cervical ymph nodes
Posterior 1/3 of tongue - deep cervical lymph nodes
- lymph vessels of the tongue cross the midline; lesion my spread to the opposite side
Describe the sensory innervation of the tongue.
Anterior to epiglottis - X, visceral sensory, touch, taste
Posterior 1/3 of tongue - IX, visceral sensory touch and taste
Anterior 2/3 of tongue - V3, somatic sensory touch
VII, taste
Describe the path of the lingual nerve.
Courses near the submandibular and sublingual salivary glands
What are the branches of the facial nerve?
Greater Petrosal N. - visceral motor parasympathetics
Stapedial N. - branchiomotor stapedius
Chorda Tympani - Taste to anterior 2/3 of tongue, parasympathetics to submandibular and sublingual
What is the clinical risk of an impacted molar tooth extraction?
Severing the lingual nerve in the floor of the mouth - lose touch and taste
What innervates the salivary glands?
CN VII
Parasympathetics hitchhike with the lingual nerve
Submandibular ganglion - suspended from the lingual nerve
What symptoms are present with damage to the facial nerve at the internal auditory meatus?
All facial nerve symptoms - paralysis, loss of taste, hyperacousia, decreases salivary secretion
VIII - auditory/vestibular deficits
What symptoms occur with facial nerve damage at the stylomastoid foramen or in parotid gland?
ONLY facial paralysis
No loss of taste, no hyperacousia, no decrease in secretion of saliva
