7/23 Part One (Cranial Dvlpmt. & Innerv; Cranial Nerve overview; Cranio-facial muscltr.)

Question 1

What nerve is the motor portion of the hyoid arch?

Answer 1

Facial nerve

Question 2

The facial nerve has what kind of receptors that are “rostral?” Where?

Answer 2

taste receptors

2/3 of the tongue

Question 3

The facial nerve sends what kind of fibers? To where? Via what?

Answer 3

Sends preganglionic parasympathetic fibers to pterygopalatine ganglion via greater petrosal branch

Question 4

After the preganglionic parasympathetic fibers of the facial nerve go to the pterygopalatine ganglion, where do the POSTganglionic fibers go?

Answer 4

lacrimal gland

secretomotor fibers

Question 5

The facial nerve also carries preganglionic parasympathetic fibers to the ________ and ________________ glands. Before that, the preganglionic fibers synapse in the __________________.

Answer 5

• sublingual, submandibular

- submanibular ganglion

Question 6

Facial nerves do NOT carry what?

Answer 6

postganglionic parasympathetic innervation

Question 7

What nerves can carry PREganglionic parasympathetics out?

Answer 7

CN 3
CN 7
CN 9
CN 10

Question 8

Cranial nerve VIII is an evolutionary branch of…

Answer 8

Cranial nerve VII

so it only takes the sensory component, not motor

Question 9

Unlike CN 3-12, CN 1 and 2 are direct extensions of what?

Answer 9

brain tissue

Question 10

Why is CN 8 an evolutionary branch of CN 7?

Answer 10

Because it is for special senses like 1 & 2, but it is NOT a direct extension of the brain tissue.

Question 11

Nerves...
Nerve 8:
Type:
Function:
Foramen:

Answer 11

Vestibulocochlear nerve
Sensory
Hearing and balance
Internal auditory meatus

Question 12

Nerves...
Nerve 9:
Type:
Function:
Foramen:

Answer 12

Glossopharyngeal nerve
Both
Beginning of pharynx, posterior tongue
Jugular foramen

Question 13

Concept:

The jugular foramen is in “between” what 2 bones’ sutures?

Answer 13

temporal and occipital

Question 14

What kind of fibers does the glossopharyngeal nerve carry? Where do they synapse? Where do they travel after?

Answer 14

Preganglionic parasympathetic secretomotor fibers

They synapse in the otic ganglion then travel with auriculotemporal branch of mandibular nerve to parotid gland

Question 15

CN 9 contains general sensory of what?

Answer 15

pharynx, tonsils, and posterior 1/3 of tongue (AND taste fibers for that part of tongue)

Question 16

Nerves...
Nerve 10:
Type:
Function:
Foramen:

Answer 16

Vagus nerve
Both
Throat to end of midgut
Jugular foramen

Question 17

The vagus nerve starts off as dorsal CN, so it has ________ components.
It is associated with branchial arches, so it also carries ________ components.

Answer 17

sensory

motor

Question 18

CN 11 is an evolutionary branch of…

Answer 18

CN 10

Question 19

What is the accessory nerve sometimes called? Why?

Answer 19

Spinal accessory nerve

It has spinal components that are combining and coming together with the vagus nerve

Question 20

Nerves...
Nerve 11:
Type:
Function:
Foramen:

Answer 20

Accessory nerve
Motor
Larynx, pharynx, trapezius, sternocleidomastoid
Exits via jugular foramen

Question 21

In order to “join” with the vagus nerve, CN 11 has to enter through where?

Answer 21

the foramen magnum

Question 22

What are the “true” muscles of mastication?

Answer 22

Temporalis muscle
Masseter muscle
Medial pterygoid
Later pterygoid (upper head: to articular disc. lower head: to neck of mandibular condyle)

Question 23

What are the “accessory” muscles of mastication? Innervated by what?

Answer 23

Buccinator (CN 7)
Digastric (V3 and CN 7)
Tongue (CN 12)

Question 24

The digastric muscle has 2 what?

Innervations?

Answer 24

bellies; anterior and posterior
Anterior: V3
Posterior: CN 7

Question 25

Tensor tympani is in the…
What does it do?
What innervates it?

Answer 25

ear
tenses up malleus so it doesn’t move as much; weakens vibration transmission
CN V3

Question 26

What major muscles of the mandibular arch are innervated by V3?

Answer 26

Temporalis
Messeter
Medial head of pterygoid
Lateral head of pterygoid
Mylohyoid
Anterior belly of digastric
Tensor tympani

Question 27

What major muscles of the hyoid arch are innervated by CN 7?

Answer 27

Posterior belly of digastric
Facial muscles
Stapedius
Stylohyoid

Question 28

“The styloglossus is NOT innervated” by what?

Answer 28

CN 12

Question 29

The parotid gland is near…
The sublingual is under…
The submandibular gland is under…

Answer 29

Parotid: by ear
Sublingual: under tongue
Submandibular: under mandible