Lecture Six

Question 1

How does CN7 exit the cranium? then what does it join with?

Answer 1

stylomastoid foramen

goes to parotid gland and joins with parotid plexus and the nerve divides into 5 branches.

Question 2

What are the five branches of the parotid plexus+CN7?

Answer 2

"Two Panicking Zebras Bit My Coccyx"
T= temporal
P= Post Auricular
Z= Zygomatic
B= Buccal
M= Mandibular
C= Cervical

Question 3

Bells Palsy is a result of?

Answer 3

Swelling or compression on CN7

Question 4

CN 7 innervates?

Answer 4

1. Salivary glands (chorda tympani)
2. Nasal Mucosa (Nasal nerve)
3. Oral Mucusa (lesser and greater palatine)
4. Lacrimal Gland (greater petrosal)
5. Taste (sensory, ant. 2/3)
6. Stapedius muscles in middle ear (motor)

first four are parasympathetic

Question 5

Parotid gland innervated by what nerve? where does it synpase? if parasympathetic innervated consistency of mucosa? is sympathetic?

Answer 5

CN9 glossopharyngeal
synapses in otic ganglion which is in infratemporal fossa (parasymp)
If para= thin water fluid
if symp= thick mucosa

Question 6

What is the largest salivary gland? where is it located?

Answer 6

Parotid

between ramus and mastoid process

Question 7

Infection in parotid gland can cause? what percent of salivary tumors are found in parotid gland? Where is pain often felt?

Answer 7

Mumps.
80% (removal is risky due to potential damage of CNV11)
Behind the ear/temporomandibular joint due to innervation by CNV3

Question 8

Postganglionic sympathetic nerve fibres from the sympathetic chain enter the skull by travelling on which artery?

Answer 8

Internal carotid.

Question 9

Cauda Equina made up of?

Answer 9

Dorsal and Ventral roots

Question 10

Geniculate Ganglion, motor or sensory ganglion?

Answer 10

Sensory (for facial nerve)