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Identify on gross spinal cord specimen
- conus medullaris
- spinal nerves with ant/post roots
- spinal ganglion
- filum terminale
- denticulate ligament
What is the epidural space (level of sc)?
- TRUE epidural space - between dura and bones - there is lots of fat here
Spinal cord anatomy (single level)
Identify the spinal tracts (on sc cross-section)
The spinothalamic tract (where is it, what does it do)?
- - in the 'anterolateral system'
- - does pain and temperature (ascending)
PCML (where is it, what does it do)?
- in the 'dorsal columns'
- responsible for: discriminative touch, pressure, vibration, proprioception
- fasciculs cuneatus is more medial carries info from above T6
- fasciculus gracilus is more lateral, carries info from T6 and below
Spinothalamic tract (where do fibers enter, cross, end)?
- Fibers enter at spinal levels, can ascend or descend a couple of levels in Lissaeur's tract
- synapse in posterior horn
- post-synaptic neurons cross the midline (anterior white commisure) & ascend in the spinothalamic tract
- synapse in VPL of thalamus
- Fibers project to primary somatosensory cortex
PCML (where do fibers enter, cross, end)?
- fibers enter in posterior horn of sc and synapse in posterior horn
- axons travel in cuneatus or gracilis
- synapse with 2nd order neuron in the nucleus cuneatus or nucleus gracilis
- fibers cross the midline as internal arcuate fibers (caudal medulla)
- synapse with VPL of thalamus
- fibers project to primary somatosensory cortex
What is conscious vs unconscious proprioception and where does this information travel?
- conscious = PCML (to cerebrum)
- unconscious = spinocerebellar tract (to cerebellum)
Corticospinal tract (where do fibers enter, cross, end)?
- From the motor cortex, fibers travel in the internal capsule
- In the rostral medulla, fibers come together as the pyramids
- In the caudal medulla, 85% of fibers cross to become the lateral CST (at the pyramidal decussation)
- The other 15% of fibers become the anterior CST
- Lateral fibers exit contralateral at SC
- anterior fibers exit bilaterally at SC
Corticospinal tract function (A and L)?
- anterior = postural muscles
- lateral = voluntary limb movement
Where are the SNS and PSNS in the sc?
- SNS = T1 - L2
- PSNS = S2 - 4
- cell bodies for both in the lateral horn
Micturition neuronal control