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11b - types of transection of SC - Coggle Diagram
11b -
types of transection of SC
Spinal cord transections
can be divided into 3 types:
Complete transection,
Causes
Gun shot injury.
Dislocation of the spine.
Occlusion of the spinal blood vessel.
Commonest site of involvement is at the mid thoracic level.
Incomplete transection,
Hemisection of the spinal cord.
It is a lesion involving one lateral half
of the spinal cord.
Here, autonomic functions are usually normal.
The other functional changes which takes place
can be divided into 3 categories:
2.changes at the level of
hemisection
On the same side
Sensory changes.
Complete anaesthesia occurs due to damage to the posterior nerve root,
posterior horn cells and
spinothalamic fibers
(which cross to the opposite side).
Motor changes.
Complete lower motor neuron type paralysis is seen due to damage
to the anterior horn cells.
1 more item...
On the opposite side
Sensory changes.
Some loss of pain sensations due to injury of pain
fibers of spinothalamic tract which cross horizontally in the same
segment and may be caught in the lesion.
Motor changes.
Nil or very slight due to damage of some pyramidal
tract of the same side.
changes below the level
of hemisection
On the same side
Sensory changes
Fine touch,
tactile localization and
tactile discrimination,
vibration sense and
kinesthetic senses
is lost due to damage of the dorsal columns.
Pain
temperature and
crude touch remain unaffected
as the spinothalamic tracts (anterior and lateral) carrying these sensations
cross to the opposite side and escape injury.
Motor changes
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On the opposite side
Sensory changes
Complete loss of pain,
temperature and crude touch
due to damage
to the spinothalamic fibers
which come from the opposite side.
Kinesthetic sensations, fine touch etc.
will persist because the
posterior columns of the opposite side are not damaged.
Motor changes
1 more item...
changes above the
level of the hemisection
On the same side
A band of hyperaesthesia present due to irritation of upper cut end of the damaged fibers.
On the opposite side
Hyperaesthesia may be referred.