Cranial Nerves 7-12 Flashcards
What is the 7th Cranial nerve and what kind of nerve is it?
Facial nerve, Mixed nerve
Where does the facial nerve originate and what path does it take out of the skull?
Pontomedullary junction, enters petrous bone via internal acoustic meatus, splits into 3 branches and exits the skull via the stylomastoid foramen
What special sensory does the facial nerve innervate?
Anterior 2/3 taste of the tongue
What autonomic innervation does the facial nerve give?
Lacrimal glands all the salivary gland except parotid
What is the structure where all the sensory bodies of the facial nerve group together?
Geniculate ganglion
What are the 3 branches of the facial nerve in the petrous bone?
Greater petrosal, Chorda tympani and stapedius
How is the facial nerve tested?
Test muscles of facial expression and the corneal reflex
What are the afferent and efferent limbs of the corneal reflex?
Afferent = trigeminal - opthalmic branch, efferent = facial nerve
What is the 8th Cranial nerve and what kind of nerve is it?
Vestibulocochlear nerve, special sensory
What is the vestibulocochlear nerve responsible for ?
Hearing and balance
Which 2 nerves pass through the interal acoustic meatus?
Facial and Vestibulocochlear
How do you test the vestibulocochlear nerve?
Cruse hearing test and ask about balance
What is age-related hearing loss called?
Presbyacusis
What is an acoutic neuroma ?
benign tumour of the schwann cells involving vestibulocochlear nerve, can cause tinnitus and vertigo
Which 4 nerves exit the skull in the carotid sheath?
Glossopharyngeal, Vagus, accessory and Hypoglossal
