Sensory Pathways (Task 1)

Question 1

Info carried in Dorsal Column Medial Lemniscal (DCML) Tract

Answer 1

Fine Touch
Proprioception
Vibration

Question 2

Info carried in Anterior Spinothalamic Tract (Anterolateral System)

Answer 2

Crude Touch

Pressure

Question 3

Info carried in Lateral Spinothalamic Tract (Anterolateral System)

Answer 3

Pain

Temperature

Question 4

Symptoms of lesions above and below decussations

Answer 4

Above - contralateral symptoms

Below - ipsilateral symptoms

Question 5

Tracts carrying unconscious proprioception info

Answer 5

Spinocerebellar Tracts

Question 6

Impact of a posterior spinal artery blockage

Answer 6

Ischaemia to dorsal column medial lemniscal tract

Question 7

Impact of an anterior spinal artery blockage

Answer 7

Ischaemia to anterolateral tracts (anterior and lateral spinothalamic tracts)

Question 8

Two parts of the DCML tract

Answer 8

Fasciculus Gracilis (Medial)
Fasciculus Cuneatus (Lateral)

Question 9

Neurons that travel in fasciculus gracilis of DCML

Answer 9

First order neurons from upper limbs (T6 and above)

Question 10

Neurons that travel in fasciculus cuneatus of DCML

Answer 10

First order neurons from lower limbs (T6 and below)

Question 11

Nuclei where DCML first order neurons synapse

Answer 11

Nucelus Gracilis and Nucleus Cuneatus in Medulla Oblongata

Question 12

Synapse point of second order neurons in DCLM pathway

Answer 12

Contralateral Thalamus

Question 13

Decussation point of DCML pathway

Answer 13

Medulla Oblongata after first order neuron synapses with second order neuron

Question 14

Path taken by third order DCML neuron

Answer 14

Ventral Posterolateral Nucleus of Thalamus > Internal Capsule > Synapse at Primary Sensory Cortex

Question 15

Path of first order neuron in anterolateral tracts

Answer 15

Enters Spinal Cord
Ascends 1-2 Vertebra
Synapse in Dorsal Horn at in Substantia Gelatinosa

Question 16

Decussation point of aterolateral tracts

Answer 16

Spinal cord after first order neuron synapses with second order neuron

Question 17

Path of second order neuron in anterolateral tract

Answer 17

Decussates in spinal cord and splits into two
Pain and temperature travel in lateral spinothalamic tracts
Crude touch and pressure travel in anterior spinothalamic tracts
Both paths synapse in thalamus

Question 18

Path of third order neuron in anterolateral tract

Answer 18

Ventral posterolateral nucleus of thalamus > Internal capsule > Sensory Cortex

Question 19

Symptoms present in a LEFT sided spinal lesion at T4

Answer 19

LEFT (ipsilateral) sided loss of DCML functions - fine touch, proprioception and vibration below T4 as lesion is below the decussation point

RIGHT (contralateral) sided loss of anterolateral functions - crude touch, pain and temperature below T4 as lesion is above the decussation point

LEFT (ipsilateral) sided hemiparesis below T4 as lesion is below decussation point of majority of descending motor tracts

Question 20

Hemi-section of the spinal cord

Answer 20

Brown-Sequard Syndrome