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
Lesion of trigeminal nerve
Trigeminal neuralgia (tic douloureux)
Facial anesthesia/numbness
Inability to bite down
