10 Questions
Where does the ascending pathway of pain start?
Injury site
Which area is responsible for controlling and inhibiting pain signals in the descending pathway?
Peri-aqueductal gray matter
What stimulates sensory nerve fibers to carry pain signals to the dorsal Horn of the spinal cord?
Prostaglandins
Which part of the brain perceives injuries to the body?
Somatosensory cortex
In the ascending pathway, which neuron crosses to the opposite side before reaching the brain's thalamus?
Second-order
Where does the ascending pathway of pain signal transmission start?
In the dorsal Horn of the spinal cord
Which structure releases prostaglandins to stimulate sensory nerve fibers in transmitting pain signals?
Damaged cells
What is the role of the second-order neuron in the ascending pathway of pain transmission?
Crossing to the opposite side
Which region plays a crucial role in controlling and inhibiting pain signals in the descending pathway?
Peri-aqueductal gray matter
What is the function of the third-order neuron in the ascending pathway of pain signaling?
Reaching the brain's thalamus
Study Notes
- The video discusses the ascending pathway of pain and the descending pathway, with a focus on the substantia gelatinosa.
- In case of a right hand injury, the pain signal travels from the injury site to the brain through the ascending pathway.
- The somatosensory cortex in the brain is where injuries to the body are perceived.
- The spinal cord plays a crucial role in transmitting pain signals, with nerves entering and exiting through the anterior and posterior roots.
- Prostaglandins, released by damaged cells, stimulate sensory nerve fibers to carry pain signals to the dorsal Horn of the spinal cord.
- The ascending pathway involves three neurons: first-order in the dorsal Horn, second-order crossing to the opposite side, and third-order reaching the brain's thalamus.
- The descending pathway, responsible for controlling and inhibiting pain signals, involves areas like the peri-aqueductal gray matter and the nucleus raphe magnus.
Test your knowledge on the ascending and descending pathways of pain signals, with a focus on the substantia gelatinosa and somatosensory cortex. Learn about the spinal cord's role in transmitting pain signals and how prostaglandins stimulate sensory nerve fibers. Explore the involvement of different neurons in the ascending pathway and key areas in the descending pathway.
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