7/23 Part One (Cranial Dvlpmt. & Innerv; Cranial Nerve overview; Cranio-facial muscltr.) Flashcards
What nerve is the motor portion of the hyoid arch?
Facial nerve
The facial nerve has what kind of receptors that are “rostral?” Where?
taste receptors
2/3 of the tongue
The facial nerve sends what kind of fibers? To where? Via what?
Sends preganglionic parasympathetic fibers to pterygopalatine ganglion via greater petrosal branch
After the preganglionic parasympathetic fibers of the facial nerve go to the pterygopalatine ganglion, where do the POSTganglionic fibers go?
lacrimal gland
secretomotor fibers
The facial nerve also carries preganglionic parasympathetic fibers to the ________ and ________________ glands. Before that, the preganglionic fibers synapse in the __________________.
- sublingual, submandibular
- submanibular ganglion
Facial nerves do NOT carry what?
postganglionic parasympathetic innervation
What nerves can carry PREganglionic parasympathetics out?
CN 3
CN 7
CN 9
CN 10
Cranial nerve VIII is an evolutionary branch of…
Cranial nerve VII
so it only takes the sensory component, not motor
Unlike CN 3-12, CN 1 and 2 are direct extensions of what?
brain tissue
Why is CN 8 an evolutionary branch of CN 7?
Because it is for special senses like 1 & 2, but it is NOT a direct extension of the brain tissue.
Nerves... Nerve 8: Type: Function: Foramen:
Vestibulocochlear nerve
Sensory
Hearing and balance
Internal auditory meatus
Nerves... Nerve 9: Type: Function: Foramen:
Glossopharyngeal nerve
Both
Beginning of pharynx, posterior tongue
Jugular foramen
Concept:
The jugular foramen is in “between” what 2 bones’ sutures?
temporal and occipital
What kind of fibers does the glossopharyngeal nerve carry? Where do they synapse? Where do they travel after?
Preganglionic parasympathetic secretomotor fibers
They synapse in the otic ganglion then travel with auriculotemporal branch of mandibular nerve to parotid gland
CN 9 contains general sensory of what?
pharynx, tonsils, and posterior 1/3 of tongue (AND taste fibers for that part of tongue)
Nerves... Nerve 10: Type: Function: Foramen:
Vagus nerve
Both
Throat to end of midgut
Jugular foramen
The vagus nerve starts off as dorsal CN, so it has ________ components.
It is associated with branchial arches, so it also carries ________ components.
sensory
motor
CN 11 is an evolutionary branch of…
CN 10
What is the accessory nerve sometimes called? Why?
Spinal accessory nerve
It has spinal components that are combining and coming together with the vagus nerve
Nerves... Nerve 11: Type: Function: Foramen:
Accessory nerve
Motor
Larynx, pharynx, trapezius, sternocleidomastoid
Exits via jugular foramen
In order to “join” with the vagus nerve, CN 11 has to enter through where?
the foramen magnum
What are the “true” muscles of mastication?
Temporalis muscle
Masseter muscle
Medial pterygoid
Later pterygoid (upper head: to articular disc. lower head: to neck of mandibular condyle)
What are the “accessory” muscles of mastication? Innervated by what?
Buccinator (CN 7)
Digastric (V3 and CN 7)
Tongue (CN 12)
The digastric muscle has 2 what?
Innervations?
bellies; anterior and posterior
Anterior: V3
Posterior: CN 7
Tensor tympani is in the…
What does it do?
What innervates it?
ear
tenses up malleus so it doesn’t move as much; weakens vibration transmission
CN V3
What major muscles of the mandibular arch are innervated by V3?
Temporalis Messeter Medial head of pterygoid Lateral head of pterygoid Mylohyoid Anterior belly of digastric Tensor tympani
What major muscles of the hyoid arch are innervated by CN 7?
Posterior belly of digastric
Facial muscles
Stapedius
Stylohyoid
“The styloglossus is NOT innervated” by what?
CN 12
The parotid gland is near…
The sublingual is under…
The submandibular gland is under…
Parotid: by ear
Sublingual: under tongue
Submandibular: under mandible
