V Trigeminal Flashcards
Where does trigeminal nerve originate?
- Nucleus of spinal tract of V - midpons-C5
- Chief sensory nucleus - midpons
- Mesencephalic nucleus - midpons-midbrain
- Motor nucleus - midpons
Where does trigeminal nerve exit the brain?
Midpons
Function of nucleus of spinal tract of V
Pain & temperature
Function of chief sensory nucleus
Touch
Function of mesencephalic nucleus
Proprioception
Function of motor nucleus of V
Mastication muscles
Where do the peripheral branches of trigeminal nerve exit the skull?
- V1 ophthalamic (sensory) - SOF
- V2 maxillary (sensory) - foramen rotundum
- V3 Mandibular (mixed) - foramen ovale
Where does the meningeal branch of V3 mandibular re-enter the skull?
Foramen spinosum (sphenoid)
the maxillary division (V2) goes through foramen rotundum and enters the ____
pterygopalatine fossa
V2 receives postganglionic parasympathetic fibers from the ____, whose preganglionic fibers are in the ____
pterygopalatine ganglion (sphenopalatine ganglion)
Facial nerve
V2 sends postganglionic fibers via its ____ branch to…
zygomaticotemporal branch –> lacrimal branch V1 –> lacrimal gland
Sensory functions of trigeminal nerve
Face, scalp, teeth, most of tongue, oral and nasal mucosa, dura mater, cerebral blood vessels
Sensory fibers from all 3 peripheral divisions of trigeminal are…
Pseudounipolar cells whose cell bodies are in the trigeminal (semi lumbar ganglion) or mesencephalic nucleus in the case of proprioception
Motor functions of trigeminal nerve
- Muscles of mastication (masseter, temporalis, medial & lateral pterygoid)
- tensor tympani and tensor veli palatini muscles
- mylohyoid and anterior belly of digastric muscles
Examination of trigeminal nerve
Touch by cotton swab, pain by pinprick, temperature, corneal reflex, jaw reflex, masticatory movements
