1 of 20

2 of 20

Ascending tract of Spinal cord

3 of 20

4 of 20

5 of 20

6 of 20

7 of 20

8 of 20

Descending Tract of Spinal cord

9 of 20

10 of 20

11 of 20

12 of 20

13 of 20

Posterior White Column -

Medial Lemniscal Pathway

medial lemniscus

​

lemniscal decussation

​

internal arcuate fiber

​

posterior white column

​

posterior root

- ipsilateral loss of discriminative touch

sensation and conscious proprioception

below the level of lesion

14 of 20

Spinothalamic Tract

spinothalamic

tract

​

​

anterior white

commissure

​

​

posterior root

decussation

- contralateral loss of pain and temperature

sensation below the level of lesion

15 of 20

Spinothalamic Tract

& Spinoreticular Tract

Widespread

cortical region

​

CL (intralaminar

thalamic nuclei)

​

reticulothalamic

pathways

​

spinoreticular

tract

Primary Motor

Area (M I)

​

VPLc (ventrobasal

nuclear complex)

​

(spinal lemniscus)

​

​

spinothalamic

tract

thalamus

reticular

formation

NeoSTT PaleoSTT

16 of 20

17 of 20

- ipsilateral UMN syndrome

at the level of lesion

Corticospinal Tract

Corona Radiata

lnternal Capsule, Posterior Limb

Crus Cerebri, Middle Portion

Longitudinal Pontine Fiber

Pyramid

Pyramidal Decussation

Corticospinal Tract

- Lateral and Anterior

CR

IC

LPF

Pyr

PD

LCST

ACST

18 of 20

19 of 20

20 of 20

Herpes Zoster (Shingles)

  • varicella-zoster virus

reactivation from

the dorsal root ganglia

​

  • unilateral vesicular

eruption within

a dermatome

​

  • T3 to L3 dermatome

lesions are frequent

​

  • zoster ophtahalmicus

(ophthalmic division

of trigeminal n., V1)

​

  • Ramsey-Hunt syndrome

(sensory br. of VII)

​

  • acyclovir, antiviral agent