For each of the sensory pathways A–E, select the most appropriate option from the list below.
1. Third order sensory pathway from thalamus to the postcentral gyrus.
2.. The tracts carrying proprioception impulses in first order sensory neurones to the nucleus gracilis and cuneatus.
3. A tract in the brainstem carrying sensory impulses to the thalamus.
4. A tract containing the second order sensory neurones carrying pain and temperature sensation
5. A tract containing the ascending second order neurones carrying touch and pressure sensation
- Lateral spino-thalamic tract.
- Thalamic radiation.
- Medial (ventral) spino-thalamic tract.
- Dorsal columns.
- Medial lemniscus.
Medicine
A. Option 4 A tract containing the second order sensory neurones carrying pain and temperature sensation. These tracts carry pain and temperature impulses from receptors on the opposite side of the body to the thalamus.
B. Option 1 Third order sensory pathway from thalamus to the postcentral gyrus. In the postcentral gyrus the sensory impulses generate conscious sensation.
C. Option 5 A tract containing the ascending second order neurones carrying touch and pressure sensation. These tracts carry touch and pressure impulses from the opposite side of the body to the thalamus.
D. Option 2 The tracts carrying proprioception impulses in first order sensory neurones to the nucleus gracilis and cuneatus. These tracts carry impulses from muscle spindles and other receptors on the same side of the body that ascend in first order sensory neurones to the gracile and cuneate nuclei. From there second order neurones cross to the opposite side of the body in the sensory decussation to join the medial lemniscus and ascend to the thalamus.
E. Option 3 A tract in the brainstem carrying sensory impulses to the thalamus. This is the common sensory pathway in the brainstem carrying all sensory impulses to the thalamus.
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