CNVII Facial

Question 1

What are the main functions of the facial nerve and what nuclei control them?

Answer 1

Motor to muscles of facial expression (facial nucleus)

Taste from the anterior 2/3 of the tongue (solitary nucleus)

Parasympathetics to salivary glands
( superior salvatory nucleus)

Parasympathetics to lacrimal and serrous and mucus glands of nasopharynx (Superior salavatory nucleus)

Question 2

What are the five motor branches of cranial nerve VII facial?

Answer 2

Temporal
Zygomatic
Buccal
Marginal mandibular
Cervical

“tell Ziggy Bob Marley called”

Question 3

What’s the pathway for this parasympathetic innervation to the lacrimal and serous and mucous glands of the nasopharynx (as far as pterygopalatine?

Answer 3

Nucleus: Superior salivatory nucleus➡️ nervous intermedius( fibers from solitary and salvatory everything but motor ) ➡️ exits through internal auditory meatus➡️ parasympathetic preganglionic fibers form greater petrosal nerve🔀 joins with deep petrosal nerve from Superior cervical ganglion via carotid plexus➡️ together they form the Vivian nerve➡️ Vivian nerve exits via the pterygoid canal ➡️ fibers synapse with the pterygopalatine ganglion (from here fibers split to go to different sites for mucus and tear production)

Question 4

What ganglia is responsible for sending parasympathetic fibers to the serous and mucus glands of the nasopharynx? Via what root?

Answer 4

PterygoPalatine ganglia
Palatine nerves synapse with serous and mucous glands of nasopharynx.

Question 5

What ganglia sends fibers to innervate the lacrimal gland? Via what route? What does the lacrimal gland do?

Answer 5

1. The pterygopalatine ganglia
2. Fibers from the pterygopalatine ganglia catch a with the zygomatic nerve which is a branch of V2 (maxillary trigeminal) ➡️ they continue on with a smaller branch of V2 the zygomaticotemporal branch➡️ they then catch another ride with the lacrimal nerve (A division of V1 ophthalmic trigeminal) ➡️ From here they synapse with the lacrimal gland.
   (These fibers are like hitchhikers)
3. The lacrimal gland produces tears

(Sympathetic innervation also follows this route to the lacrimal gland)

Question 6

What salivary glands does CNVII facial innervate?

Answer 6

Submandibular
Sublingual salivary glands

Question 7

What ganglion sends motor fibers to the submandibular and sublingual salivary glands?

Answer 7

The submandibular ganglion

Question 8

I what pathway does the facial nerve (CNVII) innervate the sublingual and submandibular salivary glands?

Answer 8

Cell bodies in the superior salivatory nucleus send fibers out via the nervous intermedius (which contains all fibers from the facial nerve except the motor fibers)➡️ these fibers exit via the internal acoustic meatus➡️ they then dive down at a 90° angle to form the chorda tympani ➡️ The court of timpani exits via the petrotympanic fissure( and the temporal bone) The fibers of the quarter timpani join a branch of the trigeminal nerve (V3 Mandibular) called the lingual nerve ➡️ they exit to synapse with the submandibular ganglion ➡️ postganglionic fibers from the submandibular ganglion innervate the submandibular and sublingual salivary glands.

Question 9

What is the primary cell body for taste from the interior 2/3 of the tongue?

Answer 9

The genicula ganglion
(Geniculate because this pathway turns at almost a right angle, like a knee?)

Question 10

What is the pathway from a taste receptor cell all the way to the solitary nucleus?

Answer 10

A tastebud receptor synapses with a pseudo-unipolar cell whose primary afferent distal axon joins the corda tympani and runs with the lingual nerve (Part of the V3 mandibular trigeminal) ➡️ chorda tympani separates from the lingual nerve to pass through the petrotympanic Fissure ➡️ this is where the cell body, the geniculate ganglion, is of these cells ➡️ The proximal axon travels through the internal auditory meatus to synapse with the solitary nucleus. Before it synapses with the solitary nucleus it forms part of the nervous intermedius of the facial nerve.