Nerve Pathways Flashcards
posterior/ dorsal pthwy role
fine touch + skin receptors
spinocerebellar function
proprioception = GSA
where do all 1st motor neurons of the sensory tracts start
peripheral receptor enter CNS via spinal nerve in dorsal root
where does post/dorsal pthwy synapse
1- medulla
2- thalamus
3- primary somatosensory cortex = post central gyrus
upper limb medulla synapse location for dorsal pthwy
fasciculus cuneatus = lateral column
lower limb medulla synapse location for dorsal pthwy
fasciculus gracilis = medial
spinocerebellar tract synapses
1- dorsal G horn
2- cerebellar hemisphere
spinothalamic tract synapses
1- dorsal G horn
2- thalamus
3- post central gyrus
spinothalamic function
pain and temperature
spinoreticular tract synapses
1- dorsal G horn
2- medulla + midbrain
spinotectal synapses
1- dorsal G horn
2- superior colliculus of midbrain
function of spinoreticular pthwy
levels of consciousness
spinotectal pthwy function
coordinates eye and head movements ie. look at what you see
spinomesencephalic tract synapses
1- dorsal G horn
2- midbrain PAG
spinomesencephalic tract function
fear and aversion of pain
spino-olivary tract synapses
1- dorsal G horn
2- inferior olivary nucleus (medulla)
3- cerebellum
function of spino-olivary pthwy
unconscious proprioception + movement of body + limbs
sensory pthwys that decussate
1- dorsal/ post in medulla
2- spinothalamic in G horn
3- spinotectal pthwy at G horn
tectospinal function
control of visual stimuli = CN II
tectospino starts at:
tectum of midbrain superior colliculus
tectospinal tract synapses where
cervical segments of spinal cord
vestibulospinal function
maintain balance and posture
reticulospinal function
reflexes + inhibit antagonist muscles
vestibulospinal synapses where
ant column of spinal column
where does vestibulospinal tract start
medulla at lat vestibular nuclei
which CN does tectospinal tract impact
CN II
which CN does vestibulospinal tract impact
CN VIII
recticospinal synapses where
1- pons synapses in pons
2- medulla synapses in medulla
which colum does the reticulospinal tract travel down
anterior no cross
which column does the medulla travel down
lateral some cross
where does corticospinal synapse
1- ant G horn Spinal corn
corticospinal tract is what:
voluntary motor movement
upper motor neurons result in
spastic
lower motor neurons results in
atrophy
which column does coticospinal tract take
ant lateral –> ventral root
rubriospinal tract starts at:
red nucleus midbrain
rubiospinal tract synapses at:
ant G horn
motor neurons that decussate
1- tectospinal: ant column of spinal cord
2- corticospinal: medulla
3- rubrospinal: midbrain
4- reticulospinal: medulla SOME
post grey horn is [sensory/motor]
sensory
anterior grey horn is [sensory/motor]
motor
rubrospinal function
muscle tone, posture + skeletal muscle tone
