Spino-medullary junction

Question 1

Name this and state its function.

Answer 1

Pyramidal Decussation.

• Occurs to form Lateral corticospinal tract.
  
  • By crossing the midline.

Question 2

Name this and state its function.

Answer 2

Spinocerebellar tract.

• *Ascending sensory tract*.
  
  • Pressure and sensory(sensation** and **proprioception) information from the lower limb and trunk.

Question 3

Name this and state its function.

Pathway for the tract it is part of.

The tract composing of this as well.

Answer 3

Fasciculus cuneatus nucleus.

• Carries information for the upper limbs and torso, such as tactile and proprioceptive.
• Fibres for the Dorsal column medial lemniscus,
  
  • Originate from cuneatus receptors–>nucleus cuneatus–>Sensorimotor cortex..

Question 4

Name this and state its function.

Pathway for the tract it is part of.

The tract composing of this as well.

Answer 4

Gracilis cuneatus nucleus.

• Sensory information from the lower limbs and body.
  
  • Dorsal columns medial lemniscus.

Cuneatous receptors(lower)—>nucleus gacilis–>Ventral posterolateral nucleus(Thalamus)–>Post-central gryrus.

Question 5

Name this and state its function.

Answer 5

Spinal Trigeminal nucleus.

• Sensory modalities within the ipsilateral( same side) portion of the face.

Question 6

Questions on areas within the spinomedullary junction.

• The difference in the Fasciculus Cuneatus and The Fasciculus Gracilis pathways?

Answer 6

Fasciculus Cuneatus:

• Terminates at the primary somatosensory cortex.
• Sensory information from upper limbs of the body.

Fasciculus Gracilis:

• Terminates at post-central gyrus.
• Sensory information from the lower limbs of the body.