Week 1 - Neuro Intro

Question 1

What kind of neurons reside in the dorsal/posterior horn (sensory horn) of the spinal cord?

Answer 1

Multipolar neurons

Question 2

What do you call multipolar neurons in the dorsal/posterior horn (sensory horn) that send their axons to multipolar neurons in the ventral/anterior horn (motor horn)?

Answer 2

Interneurons

Question 3

What kind of neurons reside in the Lateral horn (intermediolateral cell column) of the spinal cord?

Answer 3

The preganglionic cell bodies of multipolar neurons of the autonomic nervous system.

(**only thoracic/upper lumbar regions)

Question 4

What kind of neurons reside in the ventral/anterior horn (motor horn) of the spinal cord?

Answer 4

• Alpha motor neurons (multi-polar)
  
  • a.k.a. lower motor neurons
• Gamma motor neurons (multi-polar)

Question 5

What do Alpha motor neuron axons innervate?

Answer 5

Extrafusal skeletal muscle fibers/cells

Question 6

What do Gamma motor neurons innervate?

Answer 6

Intrafusal muscle fibers/cells of the

neuromuscular spindle

Question 7

What is located in the dorsal column/funiculus of the spinal cord?

Answer 7

Ascending axons from sensory nerve cell processes (axons) whose cell bodies are located in dorsal root ganglia.

Question 8

What is located in the lateral column/funiculus?

Answer 8

• Ascending sensory nerve fibers
  
  • cell bodies located in dorsal horn
• Descending motor nerve fibers
  
  • cell bodies in brain stem/cerebrum

Question 9

What is located in the ventral column/funiculus?

Answer 9

• Ascending sensory nerve fibers
  
  • cell bodies in dorsal horn
• Descending motor nerve fibers
  
  • cell bodies in brain stem & cerebrum