SENSORY SYSTEM - la) Dissociated anaesthesia -A lesion In the centre of the cord, e. g. synngomyelia, haematomyelia, Intramedullary tumour, anterior s

. SENSORY SYSTEM - la) Dissociated anaesthesia -A lesion In the centre of the cord, e. g. synngomyelia, haematomyelia, Intramedullary tumour, anterior spinal artery thrombosis or haemorrhage. (b) Total loss of all formsl of sensalion - below the segmental level in the trunk at which the transection takes place. Often there is a zone of hyperaesthesla In the skin area supplied by the segment ot the spinal cord irnmediatety above the lesion. Only complete cord lesions produce loss of light touch, (c) Signs of posterior column alfectlon - Sensory alaxia. RombergB sign, loss ol vibration and position sense with normal tactile and pain sensations, in subacute combined degeneration and Injury or compression of cord, (d) Only lateral column affection (Pure motor spastic paraplegia). (i) Arnyotrophic lateral sclerosis. (II) Mufliple sclerosis. (iii} Anteriorly placed extradural compression, e. g , T.B spine. (Iv) Sometimes subacute combined degeneration. (v) Syringomyelia. (vl) Vascular lesions like thrombosis or haemorrhage in which sensory function has recovered. (vii) Cerebral palsy, (viii) Lathyrism (IX) Erb^ spinal paralysis. (x) Familial spastic paraplegia. (ej Postero-lateral columns affection (Sensory motor spinal cord ofdisorders) - (i) Subacute combined degeneration, (il) Multiple sclerosis, (ili) Syringomyelia. (iv) Compression myelitis, (v) Haematomyelia and myelomalacia. (vi) Lathyrism, (vii) Pellagra. [f) Radlcular spinal syndrome Signs of spinal cord compression associated wtlh root pains, segmental sensory changes or motor disturbance and spinal tenderness all