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       (PATH "gifs/Syllabus Chapters/SomatoSpthal/toon.SpThal.gif"))
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(FRAME-INFO (STRING "Objectives.  Know the tracts involved in conveying pain and temperature information from the body \(the spinothalamic tract, also known as the anterolateral system\) and face \(trigeminothalamic pathway\) through the brainstem to primary somatosensory cortex in the postcentral gyrus. The somatosensory pathways can be thought of as a chain of three neurons. The first neuron carries information from the receptor into the central nervous system. The second neuron usually has an axon that crosses the midline and ascends to the thalamus, and the third neuron projects from the thalamus to the somatosensory cortex.  Learn the pain/temperature pathway: for each of the three neurons in the \"pain\" chain from periphery to cerebral cortex, know the name and location of both the nuclei and the tracts formed by their axons. Be sure you know the route of trigeminal tracts that carry pain and temperature information from the face. Know where the second neuron in the chain crosses the midline. Locate the approximate position of the tracts in cross sections of the brain stem. Appreciate that there are alternate pain pathways such as those relaying through the reticular formation."))
(REGION (TYPE "STRUCT")
        (ACTION "spinal trigeminal tract")
        (ID 14)
        (CENTER-PT (317 211))
        (COORD-LIST (313 172) (313 249) (325 249) (325 172)))

(REGION (TYPE "STRUCT")
        (ACTION "spinal trigeminal nucleus")
        (ID 13)
        (CENTER-PT (299 221))
        (COORD-LIST (291 168) (291 262) (312 262) (312 168)))

(REGION (TYPE "STRUCT")
        (ACTION "posterolateral fasciculus \(of Lissauer\)")
        (ID 12)
        (CENTER-PT (315 297))
        (COORD-LIST (313 277) (313 314) (325 314) (325 277)))

(REGION (TYPE "STRUCT")
        (ACTION "posterior horn")
        (ID 11)
        (CENTER-PT (301 281))
        (COORD-LIST (291 273) (291 294) (312 294) (312 273)))

(REGION (TYPE "STRUCT")
        (ACTION "anterior white commissure")
        (ID 10)
        (CENTER-PT (266 280))
        (COORD-LIST (246 273) (246 289) (284 289) (284 273)))

(REGION (TYPE "STRUCT")
        (ACTION "spinothalamic tract \(spinal component\)")
        (ID 9)
        (CENTER-PT (211 214))
        (COORD-LIST (205 111) (205 286) (218 286) (218 111)))

(REGION (TYPE "STRUCT")
        (ACTION "spinothalamic tract \(trigeminal component\)")
        (ID 8)
        (CENTER-PT (222 181))
        (COORD-LIST (218 111) (218 245) (228 245) (228 111)))

(REGION (TYPE "STRUCT")
        (ACTION "ventral posterior nucleus of thalamus")
        (ID 7)
        (CENTER-PT (217 103))
        (COORD-LIST (204 97) (202 102) (202 107) (207 110) (212 111) (217 112) (222 111) (227 111) (232 111) (234 107) (234 103) (234 99) (230 97) (226 95) (222 93) (218 92) (214 91) (210 91) (206 92) (204 97)))

(REGION (TYPE "STRUCT")
        (ACTION "somatosensory radiation in internal capsule ")
        (ID 6)
        (CENTER-PT (216 42))
        (COORD-LIST (210 24) (210 65) (228 65) (228 24)))

(REGION (TYPE "STRUCT")
        (ACTION "primary afferent in trigeminal root")
        (ID 5)
        (CENTER-PT (345 175))
        (COORD-LIST (328 159) (328 178) (385 178) (385 159)))

(REGION (TYPE "STRUCT")
        (ACTION "primary afferent in spinal root")
        (ID 4)
        (CENTER-PT (345 308))
        (COORD-LIST (328 293) (328 313) (384 313) (384 293)))

(REGION (TYPE "STRUCT")
        (ACTION "posterior root ganglion")
        (ID 3)
        (CENTER-PT (358 286))
        (COORD-LIST (349 278) (349 294) (369 294) (369 278)))

(REGION (TYPE "STRUCT")
        (ACTION "trigeminal ganglion")
        (ID 2)
        (CENTER-PT (359 152))
        (COORD-LIST (348 146) (348 159) (369 159) (369 146)))

(REGION (TYPE "STRUCT")
        (ACTION "axon crossing from spinal trigeminal nucleus")
        (ID 1)
        (CENTER-PT (263 240))
        (COORD-LIST (224 230) (224 246) (290 246) (290 230)))