Point 7
Root
Columns
ALS
DSCT
LCST
Vent
Horn
Lat
Horn
Problems
Contents
Anatomy
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Let’s go through this by making a lesion of each of
the pathways or cell groups discussed so far. We will make
these lesions at spinal level T1. You will soon discover how
much you know!!
![](../pt_gifs/DRG7.GIF)
The
lesion in this area interrupts the lateral and medial
divisions of the dorsal root and the ZL. The interruption of
the dorsal root means that NO sensory information gets into
the brain from the area of the ipsilateral body
innervated by T1 dorsal root. This includes 2 pt.
discrimination, vibration and conscious proprioception
(alpha-betas), unconscious proprioception (1a, 1b and II)
and pain and temperature and crude touch (Cs and deltas). In
addition, remember that pain and temperature fibers
ASCEND IPSILATERALLY for two segments before they
enter the dorsal horn at T1. The lesion interrupts these
fibers too. The ascending delta and C fibers from T3 are
headed for the dorsal horn at T1--they are dead. The
ascending fibers from T2 are headed for the dorsal horn at
C8--they are dead!! And of course, the delta and C fibers
coming in at T1 via the dorsal root are dead!!! Thus, on the
IPSI. side the pain and temp. loss is from
T1-T3. The loss of all sensory information from T1
means that no reflexes (stretch, painful) can occur via this
dorsal root.
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