ASCENDING SPINAL PATHWAY

Question 1

ascending spinal pathway

Answer 1

somatosensory

Question 2

somatosensory modalities

Answer 2

• crude touch and pressure
• pain and temperature
• fine/ discriminative touch
• vibration
  -pressure
• prociception (conscious/ subconscious)

Question 3

components of ascending spinal pathway

Answer 3

1. external stimulus
2. receptors
3. sensory nervous system
   - 1st order neuron PNS
   - 2nd and 3rd order neuron CNS
4. brain sensory cortex in the cerebrum

Question 4

types of somatosensory system

Answer 4

1. spino-thalamic
2. dorsal column medial lemniscus
3. spino-cerebellar

Question 5

spinothalamic system (antero-lateral) pathway

Answer 5

1. 1st order neuron in drg
2. 2nd order neuron in dorsal horn
   CROSS MIDLINE to either anterior or lateral spinothalamic tract
3. 3rd order neuron in thalamus
4. sensory cortex

Question 6

spinothalamic system (antero-lateral) modalities

Answer 6

• crude touch and pressure (anterior spinothalamic )
• pain and temperature (lateral spinothalamic)

Question 7

decussation

Answer 7

crossing over of secondary sensory neuron to the opposite side of spinal cord after synapsing in the dorsal horn

Question 8

dorsal column medial lemniscus modalities

Answer 8

• fine/ discriminative touch
• vibration
• pressure
• proprioception

Question 9

dorsal column medial lemniscus pathway

Answer 9

1. first order neuron in drg
2. secondary neruon in medulla oblongata
3. cross midline (decussation)
4. 3rd order neuron in thalamus
5. sensory cortex

Question 10

Name the lobes of the brain

Answer 10

Question 11

where is the 1st order sensory cortex?

Answer 11

• post central gyrus
• behind central sulcus

Question 12

spinocerbellar system modalities

Answer 12

subconscious proprioception (perceive our position and movement of body in space)

Question 13

spinocerebellar system function

Answer 13

• control muscle tone
• regulate movement
• coordination

Question 14

spinocerebellar system pathway

Answer 14

1. 1st order neuron in drg
2. secondary neuron in dorsal horn

3a) cross (contrlateral)
- ventral spinocerebellar tract-> superior cerebellar peduncle

b) uncross (ipsilateral)
- dorsal spinocerebellar tract -> inferior cerebellar peduncle

4. cerebrellum (terminates here)