Ascending Cranial Pathways Flashcards
CN V
trigeminal nerve
trigeminal nerve
all somatosensory of headproprio, vib, fine touchpain, temp, crude touchalso motor to mastication muscles
opthalmic nerve
V1sensory
maxillary nerve
V2sensory
mandibular nerve
V3sensory and motor
dermatomes of trigeminal
V1 - nose and upper foreheadV2 - bottom nose to lipsV3 - chin to temple
ganglia for cranial nerves
named nuclei
mesencephalic nucleus
cell bodies of primary afferents in CNS
trigeminal ganglion
primary afferents in all 3 branches of trigeminal
spinal trigeminal nucleus of five
pain, temp, crude touchV1,2,3analagous to dorsal horn nuclei in ATLS (spinothalamic tract)
pontine sensory nucleus of five
aka chief, main, principleprethalamic relay for proprio, vib, fine touchanalagous to nucleus cuneatus and nucleus gracilis
destinatons for trigeminal after pre-thalamic relay
local reflex arcsthalamus (VPM)reticular formationhypothalamuscerebellum
lower motor neuronal damage
decreased reflexesbabinski absentmuscle atrophydecreased muscle toneprofound weaknessfasciculations present (twitching)
segments in spinal cord
31
cord end in adult
L2
C1-C7 exit
above vertebrae
C8 exit
between C7 and T1
below C8 exit
above vetrebrae
sympathetics
T1-L2
parasympathetics
S2-S4
losses in hemisection
lose ipsilateral vibration, proprioception, fine touchlose contralateral pain, temp, crude touchbrown sequard
dorsal cord syndrome
lose bilateral dorsal columns
ventral cord syndrome
lose anterior 2/3 of cordventral column loss
brown-sequard syndrome
hemidisection of spinal cord
central cord syndrome
affect area around ventral commissure-increased pain with slight stimuli
segmental syndrome
affects all cord functions at one or more levelstransverse cord lesionlesions above - impotence and spastic paralysis of bladder
cauda equina syndrome
asymmetric multiradicular painleg weaknesssensory lossbowel/bladder dysfunctionsaddle anesthesia
neuralgia
lancinating painsharp
compression of trigeminal nerve
superior cerebellar artery
