Diseases of the nervous system : a text-book of neurology and psychiatry . FECTIONS OF THE PERIPHERAL NERVES /?^ G DK Ll- Pi)9 m>l \K -i5 Fig. 124.—Cutaneous reflex zones of hyperalgesia, showing their relations with thespinal root segments and their vegetative nervous system connections. The dottedareas are to be referred to the internal surfaces. (After Dejerine.) NEURALGIAS 249 of apprehension may precede the coming on of an attack; vaguesensations of discomfort often antedate the neuralgic of pain, Hke pin-pricks, short twinges, etc., announce theadvent of a more seriou
Diseases of the nervous system : a text-book of neurology and psychiatry . FECTIONS OF THE PERIPHERAL NERVES /?^ G DK Ll- Pi)9 m>l \K -i5 Fig. 124.—Cutaneous reflex zones of hyperalgesia, showing their relations with thespinal root segments and their vegetative nervous system connections. The dottedareas are to be referred to the internal surfaces. (After Dejerine.) NEURALGIAS 249 of apprehension may precede the coming on of an attack; vaguesensations of discomfort often antedate the neuralgic of pain, Hke pin-pricks, short twinges, etc., announce theadvent of a more serious attack, or may be the sole evidence of anabortive one. Such mild phenomena are extremely frequent incertain of the so-called predisposed or neuralgic individuals, and theyfeel that they cannot live at high altitudes; others fear rain, or an eastwind; a thunder storm causes others to have twinges; while, again. Temporal CD7) Vertical W8) Orbital CDS, 3 Nasofrontal (.0 3,h)Temporofrontal {D5,6) MaxillaryNasolabial Mental arietal {DO) Occipital {DIO) -Mandibularyoicl. Superior LaryngealInferior Laryngeal Fig. 125.—Cutaneous reflex zones of hyperalgesia of the head, neck, and shoulders intheir relations to vegetative nerve (somatic) disturbances. (After Dejerine.) certain dietary indiscretions make others complain of painful twingesfor days. Just what conditions are at the basis of these featuresmay be difficult to run down. They are none the less real. Skin hypersensitiveness is frequent. It may precede or accompanyan attack, and persist after the pain has ceased. Epicritic sensibilitj^is mostly implicated. Light touch, a pin-prick, or slight degrees ofheat or cold are magnified. Deep pressure and extremes of heat andcold are usually palliative. 250 AFFECTIONS OF THE PERIPHERAL NERVES Anesthesia is not infrequent following an attack of pain, and theexact topographical distribution of ithe sensory modifications on theskin throw considerable light on the possible causation of
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