Anatomy of the Motor system Flashcards

1
Q

Name the three types of fibres in the cortex

A

projection fibres, association fibres and commisural fibres

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2
Q

which fibres are in the :

  1. corpus callosum
  2. corona radiata
A
  1. commisural fibres

2. projection fibres

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3
Q

path of the corticobulbar tract

A

UMN projection fibres from cortex through genu ( geniculate fibres) in internal capsule to the cranial nerves

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4
Q

path of corticospinal tract

A

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

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5
Q

Where are UMN cell bodies

A

layer 5 of the primary motor cortex (internal pyramid layer)

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6
Q

symptoms of UMN syndrome

A

weakness, stiffness of CONTlateral muscle
exaggerated reflex - babinski, spasticity , clonus
hypotonia

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7
Q

describe:

  1. primary lateral sclerosis
  2. pseudobulbar palsy
  3. cerebal palsy
  4. multiple sclerosis
A

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
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8
Q

describe

  1. progressive muscle atrophy
  2. progressive bulbar palsy
  3. spinal muscular atrophy
A

ALL LMN diseases

  1. degen LMN - rare, early onset, 5 yr survival rate
  2. degen specific LMN, - cranial nn
  3. genetic, effects LMN
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9
Q

Describe

  1. charcot-marie-tooth-disease
  2. guilan-bar-syndrome
A
  1. inherited neuropathic disorder, progressive

2. immune attack peripheral nn , in responce to infection 80% likelihood of recovery

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