Flashcards in Anatomy of the Motor system Deck (9)
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1
Name the three types of fibres in the cortex
projection fibres, association fibres and commisural fibres
2
which fibres are in the :
1. corpus callosum
2. corona radiata
1. commisural fibres
2. projection fibres
3
path of the corticobulbar tract
UMN projection fibres from cortex through genu ( geniculate fibres) in internal capsule to the cranial nerves
4
path of corticospinal tract
UMN projection fibres from cortex through posterior limb of the internal capsule. two tracts
ventral - supplies the trunk, synapse to LMN in the spinal cord
lateral - decussates in the spinal cord and supplies the limbs, synapses to LMN
5
Where are UMN cell bodies
layer 5 of the primary motor cortex (internal pyramid layer)
6
symptoms of UMN syndrome
weakness, stiffness of CONTlateral muscle
exaggerated reflex - babinski, spasticity , clonus
hypotonia
7
describe:
1. primary lateral sclerosis
2. pseudobulbar palsy
3. cerebal palsy
4. multiple sclerosis
ALL UMN diseases
1. CS tract degen - rare, late onset
2. CB tract degen - problems with speaking, chewing, swallowing
3. damage to UMNs in developing brain. not progressive - problems with coordination/ spasticity
4. inflammation destroying myelin. - stiffness, spasticity, coordination speech
8
describe
1. progressive muscle atrophy
2. progressive bulbar palsy
3. spinal muscular atrophy
ALL LMN diseases
1. degen LMN - rare, early onset, 5 yr survival rate
2. degen specific LMN, - cranial nn
3. genetic, effects LMN
9
