05 Somatosensory Lesions, deficits Flashcards
1
Q
rhizotomy
A
surgical cutting of dorsal nerve root for total sensory anesthesia in that dermatome
2
Q
cordotomy
A
- surgical cutting of anterolateral tract for pain relief
- permanent pain/temp loss of all contralateral dermatomes 2-3 levels below lesion
- only performed for terminally ill
3
Q
Peripheral nerve lesion
A
ex:
- peripheral neuropathy–‘glove and stocking loss’
- herniated disk
4
Q
complete cord transection
- causes
- effects
A
- trauma, tumor
- total bilateral sensory/motor loss
5
Q
Anterior cord syndrome
- causes
- effects
A
- fracture vertebrae, infarction
- loss of pain/temp (anterolateral system)
6
Q
Posterior cord syndrome
- causes
- effects
A
- fractured vertebrae, infarction, syphilis
- loss of fine touch, vibration, proprioception (PCML)
7
Q
Central cord lesion
- causes
- effects
A
- syringomyelia (cyst in cenral cord), hyperextension of cervical spine (Christopher Reeve)
- Small central lesion: Loss of pain/temp (anterolateral)
- large lesion: loss of motor and sensory (with possible “sacral sparing” of anterolateral tract)
8
Q
Brown-Sequard syndrome
-effects
A
- Hemisection of cord
- ipsilateral loss of motor and PCML
- contralateral loss of anterolateral (2-3 segments below lesion)
- ipsilateral loss of anterolateral only at segment cut
9
Q
Unilateral lesion at VPL
-effects
A
-Contralateral loss of all body sensation (but not face)
10
Q
Unilateral lesion in VPM
-effects
A
-Contralateral loss of all face sensation (except oral cavity because of bilateral innervation?)
11
Q
Unilateral lesion in SI cortex
-effects
A
-Contralateral loss of all sensation in region of SI cortex
12
Q
Lesion in Lateral Medulla
-effects
A
- loss of anterolateral tract–Contralateral loss of pain/temp in body
- loss of spinal trigeminal tract (trigeminothalamic tract)–Bilateral loss of pain/temp in face
- PCML and Trigeminal Lemiscus tracts spared
