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SOMATIC SENSORY SYSTEM
Type I,II,III, and IV fibers in spinal nerves
A-alpha, A-beta, A-delta and C-fibers
Free vs. encapsulated nerve endings
Golgi tendon organ
Muscle spindle
Extrafusal fiber
Intrafusal fiber
Group Ia and group II afferents
Primary (annulospiral) and secondary endings
Nuclear chain fiber
Nuclear bag fiber
Dorsal column system
Dorsal columns (= gracile + cuneate fasciculi)
Dorsal column nuclei (=gracile + cuneate nuclei)
Medial lemniscus
Ventroposterolateral nucleus (VPL) of the thalamus
Primary somatic sensory cortex (= areas 3,1 and 2)
Barrels (in vibrissal representation of rodent cortex)
Principal (or main) sensory nucleus of the trigeminal
Ventroposteromedial nucleus (VPM) of the thalamus
Anterolateral system
Spinothalamic tract (= anterolateral spinothalamic tract = lateral + anterior
spinothalamic tract)
Spinal nucleus of the trigeminal (= spinotrigeminal nucleus)
Spinal tract of the trigeminal
Trigeminothalamic tracts
Mesencephalic nucleus of the trigeminal
Parietal association cortex (=areas 5 & 7)
Neospinothalamic tract
Paleospinothalamic tract
Archispinothalamic tract
Periaqueductal gray
Raphe nuclei
Raphe-spinal projection
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