Cranial Nerve V, VII, and VIII Flashcards
What nuclei are destination nuclei
Sensory nuclei
What nuclei are origin nuclei
Motor nuclei
What are the main functions of the trigeminal nerve (3)
- Facial sensation
- Muscles of mastication
- Tensor tympani muscle
What are the main functions of the facial nerve (4)
- Muscles of facial expression
- Taste
- Lacrimation
- Salivation
What are the main functions of the vestibulocochlear nerve (2)
- Hearing
2. Equilibrium sense
What is the largest cranial nerve
Trigeminal nerve
What are the 3 branches of the trigeminal nerve
V1 Opthalmic (sensory and a little motor) V2 Maxillary (sensory) V3 Mandibular (sensory and motor)
Where does a motor signal originate (3)
- Cord
- Medulla
- Pons
What does the V1 opthalmic branch of the trigeminal nerve innervate for sensory function (7)
- Eyeball
- Lacrimal gland
- Conjunctiva
- Parts of nasal cavity
- Forehead
- Upper eyelid
- Eyebrow
What does the V1 opthalmic branch of the trigeminal nerve innervate for motor function (1)
- A tiny bit of fibers for dilator pupillae
What does the V2 maxillary branch of the trigeminal nerve innervate for sensory function (8)
- Lower eyelid
- Upper lip
- Upper gums
- Upper teeth
- Cheek
- Nose
- Palate
- Part of pharynx
What does the V3 mandibular branch of the trigeminal nerve innervate for sensory function (5)
- Lower lip
- Lower gums
- Lower teeth
- Palate
- Anterior 2/3 tongue
What does the V3 mandibular branch of the trigeminal nerve innervate for motor function (2)
- Muscles of mastication
2. Tensor tympani
Where does the V1 opthalmic branch of the trigeminal nerve exit the skull
Superior orbital fissure
Where does the V2 maxillary branch of the trigeminal nerve exit the skull
Foramen rotundum
Where does the V3 mandibular branch of the trigeminal nerve exit the skull
Foramen ovale
Where are most primary sensory cell bodies of the trigeminal nerve housed
Trigeminal ganglion
What is another name for the trigeminal ganglion
Semilunar ganglion
Where do cell bodies of the sensory fibers of the trigeminal nerve lie in relation to the CNS
Outside like all somatosensory neurons
What are the 3 destination nuclei of the trigeminal sensory nucleus
- Mesencephalic trigeminal nucleus
- Chief trigeminal sensory nucleus
- Spinal trigeminal nucleus
What is another name for the chief trigeminal sensory nucleus
Main sensory nucleus
What does the mesencephalic trigeminal nucleus mediate
Proprioception
What does the chief trigeminal sensory nucleus mediate
Discriminative touch
What does the spinal trigeminal nucleus mediate
Pain and temperature
Where does the spinal trigeminal nucleus synapse
Caudal medulla
What are the proprioceptive axons in the trigeminal nerve the stretch and tendon receptors for
Muscles of mastication (makes sense since the motor function of the nerve is mastication)
True or False:
The mesencephalic nucleus is a DRG that has been pushed into the CNS
True
What does the mesencephalic nucleus being pushed into the CNS mean
There is no synapse there
What is the only exception to the DRG have to be in the PNS
The mesencephalic nucleus
Where do the fibers traveling to the mesencephalic nucleus travel
The bypass the trigeminal nucleus and turn upwards into the mesencephalic nucleus but do not synapse
What do the fibers do once in the mesencephalic nucleus
The pass the cell body, leave the nucleus, and synapse in the nearby motor nucleus