5 Questions
Which part of the brain is responsible for perceiving injuries to the body?
Somatosensory cortex
What stimulates sensory nerve fibers to carry pain signals to the dorsal horn of the spinal cord?
Prostaglandins
Where do nerves enter and exit the spinal cord in relation to pain signal transmission?
Anterior and posterior roots
Which area is involved in controlling and inhibiting pain signals in the descending pathway?
Peri-aqueductal gray matter
How many neurons are involved in the ascending pathway of pain signal transmission?
Three neurons
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.
Explore the ascending and descending pathways of pain transmission, focusing on the role of the substantia gelatinosa and the spinal cord. Learn how pain signals travel from injury sites to the brain, and the involvement of different neurons in these pathways.
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