Fix the different attributes of pain. If a child himself at night, she wept and said: "It is a pain." Her mother may ask: "where it hurts, baby?" Think of it as two different approaches to pain - "motivational-affective component that is phylogenetically primitive, and the pain, nothing bad happened to be avoided, and changes recently acquired" sensory / discriminative ability to see exactly where the pain is and react appropriately. How to examine the complex structures involved in our recognition and reaction to pain, it seems that we can easily classify them into two groups, those relating to the answer to pain, discomfort, and those who are associated with sensory / discriminatory aspects of pain. We will systematically apply color code paths of these two "types" of pain.
Pain in the cortex
It was said that the structure of the crust are only tangentially involved in the perception of pain, if at all. This is obviously very stupid, the number of connections linking higher cortical structures of testicular pain in the middle of the hill and the brainstem. Bark The main players:
Primary sensory cortex, S
Secondary sensory cortex, SII
The front part of the insulation
Cingulate gyrus.
The next three photos clearly show their location - SI refers to the location of pain, while three other structures are considered to be related to emotional and motivational aspects, which from now because of the brevity we will call "emotional" pain, Although the "pain" pain may be a better word!
The human brain viewed from the side, showing sensory cortex SI and SII. SI is a thin band consists of Brodman areas 3,1 and 2 to the rear of the central sulcus, and SII lies just above the lateral sulcus.
Temporal lobe was removed to reveal the insulation in all its splendor
- The front part is probably related to the perception of pain.
Then look at the medial side of the world, showing the cingulate gyrus.
The front part of the cingulate gyrus is important in the perception of "emotional" pain.
Thalamus
Thalamus is a "switching station" in the brain. Several of his many nuclei are associated with pain. lateral nucleus primarily sensory / discriminatory aspects, the median those "emotional" pain. Since the hill is so complex three-dimensional structure is very difficult to visualize. Therefore, the supposed "build" of the medial (adding the kernel) in the diagram below (the direction of the arrow):
Add a poorly defined medial nucleus of the midline. Plonk the side of those that we have on the dorsomedial nucleus (DM), and transmit the anterior nucleus (ANT).
Internal borders nucleus dorsal medullary lamina on the side, and separates them from the front of the testicles. The internal medullary lamina are the intralaminar nuclei, including centro (cm) and the nucleus centrolateral.
Lateral internal medullary lamina (IML) is the ventral posteromedial nucleus (VPM) and prior to this is the ventral anterior nucleus (VA).
More on the side of the back, we have (LD), lateral posterior (LP), ventral lateral (VL) and ventral posterolateral nuclei. Pulvinar (gray) is located at the rear.
Beware of discrete midline nuclei - the first group that came as the "construction" hill. These include:
Reuniens nucleus
Rhomboid nucleus
Nucleus submedius
Although it is difficult to identify and taboo in most neuroanatomy texts, these nuclei, particularly submedius, it can be very important in the perception of pain.
No comments:
Post a Comment