Organic and functional nervous diseases; a text-book of neurology . pticthalamus (OT) to the occipital lobe ; E, auditory tract from the int. geniculate body (to which a tractpasses from the VIII. N. nucleus) to the temporal lobe ; F, superior cerebellar peduncle; G, middlecerebellar peduncle ; H, inferior cerebellar peduncle; ON, caudate nucleus; CQ, corpora numerals refer to the cranial nerves. setting up of vasomotor and trophic reflex acts, or, if the irritation bekept up, of a general sense of uneasiness throughout the body, evencomplex reflex acts to remove the source of
Organic and functional nervous diseases; a text-book of neurology . pticthalamus (OT) to the occipital lobe ; E, auditory tract from the int. geniculate body (to which a tractpasses from the VIII. N. nucleus) to the temporal lobe ; F, superior cerebellar peduncle; G, middlecerebellar peduncle ; H, inferior cerebellar peduncle; ON, caudate nucleus; CQ, corpora numerals refer to the cranial nerves. setting up of vasomotor and trophic reflex acts, or, if the irritation bekept up, of a general sense of uneasiness throughout the body, evencomplex reflex acts to remove the source of pain, a quickening otrespiration and pulse^ a facial expression of discomibrt, and even auto- LOCAL SYMPTOMS. 113 matic cries. All these effects can be produced in an animal whosecortex is removed and in a man asleep or under ether. It is thereforeevident that an intense sensory impression may throw into activity theentire subcortical nervous system, or, in other words, may be distrib-uted to a multitude of motor mechanisms in cord and cerebral axis and Fig. The tract of muscular sense—the interolivary tract. subcortical ^an^Yia in addition to awakening cortical activity and caus-ing a conscious i)erception. This effect could not be attained were thesensory tracts from one region of tlie body to the cortex continuousand single. It could only be attained by an arrangement which pro-vides for the termination of a single sensory tract at various levels, a8 114 DIAGNOSIS AND LOCALIZATION OF BEAIN DISEASES. mechanism which disseminates a single sensation to a number of differ-ent motor centres. The diagram (Plate I., frontispiece) shows the ex-istence of a sensory tract made up of a number of segments each joinedto the next, but each having interpolated between it and the next aneurone capable of turning aside some of the impulses received intoside channels. Fig. 65. ^.> .^ fheLeinm- t) Lemiuxuj]ied:iuu:L?iis Cerebri !SruJ mm - The LirnjuMUi^ LemniscusPorts IMM *% W
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