LMN/UMN Flashcards
1
Q
LMN signs
A
LMN innervate ipsilateral muscles Weakness Wasting Fasciculations Hypotonia Hyporeflexia Ipsilateral facial weakness in muscles of facial expression
2
Q
LMN lesion differentials
A
Ventral horn pathology: MND, post-polio
Peripheral nerve pathology
Neuromuscular junction pathology: myasthenia gravis
Muscular pathology
3
Q
UMN signs
A
UMN innervate contralateral muscles Weakness: upper limb extensors, lower limb flexors No wasting Hypertonia, spasticity Hyperreflexia Loss of fine motor movements Pronator drift Extensor plantar response: Babinski Clonus Contralateral face weakness (sparing frontalis): brow furrowing, eye closing and blinking are preserved
4
Q
UMN lesion differentials
A
Vascular: stroke Inflammatory: MS, MND Neoplastic: tumour Degenerative: Parkinson's Infective: post-meningitis Drugs
5
Q
Spinothalamic tract anatomy
A
Trasmits pain, temperature, light touch to the thalamus
Decussates at spinal level
6
Q
Dorsal columns anatomy
A
Fasciculus cuneatus & gracilis
Transmits deep touch, propriception & vibration to pariatel cortex
Decussates at brainstem
7
Q
Corticospinal tracts anatomy
A
Transmits motor axons from the motor cerebral cortex to the spinal cord
Decussates at the brainstem
