Lecture 7- The Facial Nerve Flashcards
Where does the facial nerve exit the brainstem?
ventrolateral aspect of the pons
What is the smaller root of the facial nerve called?
nervus intermedius
What types of fibers are contained in the larger root of the facial nerve?
motor root-SVE
What ganglion does the facial nerve meet in the the facial canal?
geniculate (genicular) ganglion
What bone is the internal acoustic meatus located in?
temporal bone
What are the 4 branches of the facial nerve as it traverses the facial canal?
- Greater petrosal nerve
- Chorda tympani nerve
- Nerve to stapedius
- Sensory branch to CN X (vagus)
What nerve does the sensory branch of the facial nerve join?
Vagus Nerve (CN X)
What are the 8 branches of the facial nerve after it exits the skull via the stylomastoid foramen?
- Posterior auricular nerve
- Digastric branch
- Stylohyoid branch
- Temporal branch
- Zygomatic branch
- Buccal branch
- Mandibular/marginal mandibular branch
- Cervical branch
What two nerves join to make the nerve of the pterygoid canal?
Greater petrosal nerve
Deep petrosal nerve (sympathetics)
What branch of the facial nerve branches at the geniculate ganglion?
Greater petrosal nerve
How does the greater petrosal nerve exit into the middle cranial fossa?
hiatus for the greater petrosal nerve
Where does the greater petrosal nerve meet the deep petrosal nerve (sympathetics) to form the nerve of the pterygoid canal?
at the foramen lacerum
What happens to the greater petrosal nerve after it leaves the geniculate ganglion of the facial nerve?
- Travels in temporal bone
- Exits into middle cranial fossa via the hiatus for the greater petrosal nerve
- travels parallel to petrous ridge to the foramen lacerum
- joins deep petrosal nerve to make the nerve of the pterygoid canal
- tavels to the infratemporal fossa
Which nerve crosses through the tympanic membrane?
the chorda tympani branch of the facial nerve (CN VII)
How does the chorda tympani exit into the infratemporal fossa?
through the petrotympanic fissure
