Trigeminal Nerve Flashcards
Where does the spinal nucleus of CN V located?
- Lower Pons
- Medulla
- Upper spinal cord
Where are the primary sensory and motor nuclei of CN V located?
- Middle pons
Where is the mesencephalic nucleus located?
- Upper pons and midbrain
What are the 3 portions of the trigeminal nerve?
V1: Opthalamic
V2: Maxillary
V3: Mandibular
What functional components does CN V have?
SVE
GVA
What is the GVA component of the trigeminal nerve?
- Sensory to face
- Oral cavity
- Dura mater of anterior and middle cranial fossa
What is the SVE of CN V?
- Muscles of mastication
What sensory information is processed in the mesencephalic nucleus of CN V?
- Proprioception
What information is processed by the chief nucleus of CN V?
- Somatosensory information to the face and head
What information is processed at the spinal nucleus of CN V?
- Pain and temperature of the face and head
What division of CN V is the only one containing motor fibers?
V3: Mandibular
What reflex travels through the motor nucleus of CN V?
- Jaw jerk
What types of fibers synapse on the mesencephalic nucleus?
Ia
Ib
II
What reflex travels through the mesencephalic nucleus?
Stretch reflex
What are the 3 parts of the spinal nucleus?
- Caudalis
- Interpolaris
- Oralis
Which part of the spinal nucleus is concerned with pain and temperature to the face?
- Caudalis
How is the caudalis portion of the spinal nucleus arranged somatotopically?
- V1 ventrolateral
- V3 dorsomedial
What does the interpolaris provide sensation to?
The teeth
What does the oralis provide sensation to?
Touch from mouth, lip, nose
What pain and temperature sensation does CN VII supply through CN V?
- External ear
- External auditory meatus
- Outer surface of ear drum
What pain and temperature sensation does CN IX supply through CN V?
- Ear
- Posterior 1/3 of tongue
- Auditory tube
- Upper pharynx
What pain and temperature sensation does CN X supply through CN V?
- Ear
- Lower pharynx
- Upper esophagus
What is trigeminal neuroalgia?
- Episodic paroxysmal pain of CN V distribution
- Mild stimuli cause pain ipsi-laterally to lesion
Describe the path of the ventral trigeminal thalamic tract.
- GVA from the face descend down to the spinal nucleus
- Projectional tract cells cross over and ascend up to thalamus
How do fibers from the muscles of mastication regular jaw jerk reflex?
- Collateral from proprioceptive fibers synapse on the motor nucleus
