Anatomy of the Motor system Flashcards
Name the three types of fibres in the cortex
projection fibres, association fibres and commisural fibres
which fibres are in the :
- corpus callosum
- corona radiata
- commisural fibres
2. projection fibres
path of the corticobulbar tract
UMN projection fibres from cortex through genu ( geniculate fibres) in internal capsule to the cranial nerves
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
Where are UMN cell bodies
layer 5 of the primary motor cortex (internal pyramid layer)
symptoms of UMN syndrome
weakness, stiffness of CONTlateral muscle
exaggerated reflex - babinski, spasticity , clonus
hypotonia
describe:
- primary lateral sclerosis
- pseudobulbar palsy
- cerebal palsy
- multiple sclerosis
ALL UMN diseases
- CS tract degen - rare, late onset
- CB tract degen - problems with speaking, chewing, swallowing
- damage to UMNs in developing brain. not progressive - problems with coordination/ spasticity
- inflammation destroying myelin. - stiffness, spasticity, coordination speech
describe
- progressive muscle atrophy
- progressive bulbar palsy
- spinal muscular atrophy
ALL LMN diseases
- degen LMN - rare, early onset, 5 yr survival rate
- degen specific LMN, - cranial nn
- genetic, effects LMN
Describe
- charcot-marie-tooth-disease
- guilan-bar-syndrome
- inherited neuropathic disorder, progressive
2. immune attack peripheral nn , in responce to infection 80% likelihood of recovery