Neuroanatomy Flashcards
what level does the spinal cord end
L1 - L2
name of the spinal nerves that arise from the end of the spinal cord?
cauda equina
Ascending tracts (4)
- Dorsal column
- Anterior spinothalamic tract
- Lateral sqpinothalamic tract
- Spinocerebellar tract
Anterior spinothalamic tract detects
crude touch + pressure
Lateral spinothalamic tract detects
pain + temperature
describe the pathway of the anterior + lateral spinothalamic tracts
1st order neurones enter the spinal cord, ascend 1-2 vertebrae, then synapse
2nd order neurones decussate within the spinal cord + then ascend to the thalamus where they synapse
3rd order neurones from the thalamus project into he primary sensory cortex of the brain
spinocerebellar tract conveys…
proprioception
Descending tracts (2)
- Cortispinal tract
- Corticobulbar tract
Corticospinal tract: once the neurones descend from the brain, what do the fibres divide into?
Lateral corticospinal tract
+
Anterior corticospinal tract
which corticospinal tract decussates first?
Lateral corticospinal tract
where do the corticobulbar fibres terminate once the neurones have arisen from teh primary motor cortex?
terminate on the motor nuclei of the cranial nerves, to synapse with the lower motor neurones, carrying signals to the muscles of the head and neck
which cranial nerves are innervated bilaterally?
Hypoglossal nerve
Facial nerve
lesion to UMN of hypoglossal nerve results in
spastic paralysis to contralateral tongue
deviation to contralateral side
lesion to LMN of hypoglossal nerve results in
tongue deviation to ipsilateral side
UMN facial nerve lesion results in:
contralateral spastic paralysis of facial muscles with sparing of the forehead
