Sensory Systems and Associated Structures Flashcards
what three pathways carry sensory information to the brain
dorsal column pathway
spinothalamic pathway
spinocerebellar pathway
what are the 7 sensory modalities
special senses
discriminative touch
proprioception
pain
temperature
pressure
non discriminative touch
what sensory modality would help you determine the texture of something you touch
discriminative touch
where does sensory information first split from being entangled with motor information
dorsal and ventral roots to spinal cord
(spinal nerves are mixed)
where are the cell bodies of sensory neurons found
dorsal root ganglion which is found between the mixed spinal nerve and dorsal horn
where is the dorsal column pathway found
big section in behind dorsal horn (look up diagram)
where is spinocerebellar tract found
thin strip round lateral rim of spinal cord
where is spinothalamic tract found
thin strip ventral to ventral horn
what information does the dorsal column pathway carry
discriminative touch and proprioception
what does gracilis refer to
lower body/limb
does cuneatus refer to
upper body/limb
what are the two parts of the dorsal column and which is more medial
fasiculus gracilis - more medial (info from lower body so enters first and gets ‘pushed in’ by info from upper body - cuneatus)
fasiculus cuneatus - more lateral
how many neurons make up the dorsal column
3
learn and draw pathways
where are the second order cell bodies found in the dorsal column pathway
caudal medulla
in the nucleus gracillis and nucleus cuneatus
where is the medial lemniscus found
brain stem
what are the three parts of the internal capsule
anterior limb
genu - bend
posterior limb
where is the thalamus found in relation to the internal capsule
medial to posterior limb
what is found lateral to the genu of the internal capsule
lentiform nucleus
what is found medial to the anterior limb of the internal capsule
caudate nucleus
what information is carried in the spinothalamic pathway
pain
non-discriminative touch
temperature
where is the ventral white commissure found
in spinal cord
ventral
white matter connection between two halfs of spinal cord
where is spinal lemniscus found
brain stem
where does the dorsal column pathway and spinothalamic pathway enter the thalamus
VPL nucleus
where does the spinocerebellar pathway enter the thalamus
VPM nucleus
what information is carried in the spinocerebellar pathway
proprioception
where does the spinocerebellar pathway end
cerebellum
how many neurons form the spinocerebellar pathway
2
what are the two types of spinocerebellar pathway
dorsal and ventral
what’s the difference between the dorsal and ventral spinocerebellar pathways
dorsal doesn’t decussates
ventral decussates and then crosses back again
both have same function
what nerve carries general sensation for the head and neck
trigeminal - CN5
where do the different sensory modalities of general sensation from the head and neck segregate
in the brain stem
they are all carried together to there by the trigeminal nerve
which nerve supplies the skin covering the belly button
T10
which nerve supplies the skin covering the thumb
C6
which nerve supplies the skin covering the middle finger
C7
which nerve supplies the skin covering the pinkie
C8
which nerve supplies the skin covering the kneecap
L4
which nerve supplies the skin covering the nipple in males
T4
where can diaphragm pain be referred to
shoulder
