Nervous system Flashcards
simple pattern reflexes involve only
spinal cord circuits
simple pattern reflexes are (3)
automated, unlearned, stereotyped reflexes
simple pattern reflexes do not require
cortical input
complex postural adjustments involve (2)
spinal cord and supraspinal brain centres
supraspinal brain centres (3)
brain stem, extrapyramidal tract, cerebellum
complex postural adjustments are not
stereotyped reflexes
complex postural adjustments are (2)
flexible and goal orientated
complex postural adjustments coordinate with
voluntary movements
complex postural adjustments require
cortical input for coordination
Voluntary movements involve (3)
spinal cord, brainstem, motor cortex
Central nervous system contains
upper motor neurons
peripheral nervous system contains
lower motor neurons
central nervous system is made up of (3)
motor cortex, brainstem, spinal cord
Peripheral nervous system is made up of (2)
spinal cord and skeletal muscle
UMN order
1st order
LMN order
2nd order
cortical neurons of the motor cortex
pyramidal tract
motor neurons of the brainstem nuclei (4)
red nucleus, tectum, reticular formation, vestibular nuclei
upper motor neurons are made of (2)
cortical neurons of the motor cortex and motor neurons of the brainstem nuclei
lower motor neurons are made of (2)
α- & γ- motoneurons of the spinal anterior horn and motor neurones of cranial nerves in the brainstem
UMN axons don’t depart to the
PNS
LMN cell bodies are located in the
CNS
LMN axons depart to the
PNS
LMNs target the
skeletal muscle they innervate
NMJ
neuromuscular junction
NMJ between (2)
motor neuron axon terminal and muscle fibres
another name for junction
synapse
neuromuscular junction anatomy (7)
motor neuron, axon, path of action potential, neuromuscular junction, motor end plate, muscle fibre, myofibrils
PNS nerves can be (2)
afferent or efferent
afferent PNS nerve
to CNS
efferent PNS nerve
away from CNS
efferent nerves are
motor
afferent nerves are
sensory
what connects efferent and afferent to CNS
separate spinal roots
Nerve root region anatomy (8)
spinal cord, ventral roots, dorsal roots, vertebra, nerve, nerve fibres/axons, muscle, skin
area of skin supplied by a single spinal nerve
dermatome
group of muscles supplied by single spinal nerve
myotome
nerve plexuses (4)
cervical, brachial, lumbar, sacral
lumbar plexus
lower limbs
brachial plexus
upper limbs
sacral plexus
lower limbs
cervical plexus (3)
head, neck, diaphragm
Descending motor system is made of (2)
lateral and anterior motor system
Order of descending motor system (4)
primary motor cortex, upper motor neuron, crosses midline, lower motor neuron
pyramidal tracts cross at
decussation of pyramids
pyramid decussation anatomy (5)
pyramid, uncrossed fibres, decussation of pyramid, lateral corticospinal tract, ventral corticospinal tract
pyramids divided by
anterior median fissure
pathways to the brainstem
cerebellum basal ganglia
brainstem feeds into
pyramidal tract
pathway to cerebellum from
pons
pathway to pons from
motor cortex
pathway to motor cortex from
thalamus
pathway to thalamus from (2)
basal ganglia and cerebellum
pathway to basal ganglia from
motor cortex
motor pathways
pyramidal and extrapyramidal
pyramidal tracts (2)
lateral and ventral corticospinal tracts
lateral corticospinal tracts (4)
sacral, lumbar, thoracic, cervical
Extrapyramidal tracts (4)
rubrospinal, reticulospinal, olivospinal, vestibulospinal
controls flexor muscle tone
rubrospinal tract
gross movement and posture
reticulospinal tract
olivospinal tract role
propioception
vestibulospinal tract function
hand eye coordination
sensory pathways (4)
dorsal column medial lemniscus system, spinocerebellar tract, anterolateral system, spino olivary fibres
dorsal column medial lemniscus system (2)
gracile and cuneate fasiculus
gracile fasiculus (3)
sacral, lumbar, thoracic
cuneate fasciculus
cervical
spinocerebellar tract (2)
anterior and posterior
anterolateral system (2)
anterior and lateral
potential parkinson’s disease treatment
deep brain stimulation
DBS
deep brain stimulation
mechanism of DBS
unclear
what does DBS likely do
high frequency impulse inhibtion of subthalamic nuclei
DBS set up (5)
subthalamic nucleus, electrode, lead, extension wire, pulse generator
cause of parkinons
dopamine reduction
parkinsons degenerative changes in
globus pallidus and substantia nigra