Neuroanatomy Revision Night: Spinal Tracts Flashcards
2 main ascending tracts?
DCML
spinothalamic
if a tract starts with “spino” is it an ascending or descending tract?
usually ascending
where does the first order neuron in DCML end?
medulla
where does the 2nd order neuron in DCML end?
ventral posterolateral nucleus
where does the 3rd order neuron in DCML end?
postcentral gyrus
anything above T6 enters through the fasciculus ___ of the DCML tract
cuneatus
anything above T6 enters through the fasciculus ___ of the DCML tract
gracilis
what order neuron performs the horizontal decussation seen in the spinothalamic tract?
2nd order
all sensory tracts synapse in the thalamus T or F
T
what is the 3rd main ascending tract
spinocerebellar
pyramidal tracts originate from…
precentral gyrus
extrapyramidal tracts originate from..
the brainstem
pyramids are located?
lower medulla
what part of the corticospinal tract decussates segmentally ie NOT AT THE PYRAMIDS?
anterior
corticobulbar tract controls….
eyes
tongue
what are the only nerves to not have bilateral corticobulbar fibres
lower part of facial
hypoglossal nerve
these only get contralateral
name the 4 extrapyramidal tracts?
vestibulospinal
tectospina
reticulospinal
rubrospinal
tract for supply of anti-gravity muscles?
vestibulospinal
origin of tectospinal tract
tectum of midbrain
origin of rubrospinal tract
red nucleus in midbrain
reticulospinal excites/inhibits extensors and excites/inhibits flexors
rEticulospinal Excites Extensors
inhibits flexors
rubrospinal excites/inhibits extensors and excites/inhibits flexors
inhibits extensors and excites flexors
what kind of posturing is a result of the reticulospinal tract
decerebrate posturing
what happens in a complete cord injury?
complete loss of sensory and motor innervation below the lesion
presentation of central cord syndrome
upper limb and not lower limb weakness as well as some sensory loss due to laceration of the medial corticospinal tract
presentation of BS syndrome
contralateral loss of pain and temp (segmental crossing of spinothalamic)
ipsilateral loss of touch and vibration (DCML)
ipsilateral loss of motor function (corticospinal)
presentation of anterior cord syndrome
motor loss
pain and temp loss
sparing of proprioception
most common cause of anterior cord syndrome
anterior spinal cord infarct
what pathway is spared in anterior cord syndrome
DCML
