S

sciatic nerve

a large nerve carrying motor and sensory fibres to the posterior thigh and the leg below the knee

sciatica

pain in the distributio of he sciatic nerve that may involve the L4,L5,S1 or S2 dermatomes

scoliosis

curvature of the spine

spinal canal

the space between the vertebral bod and the lamina through which the spinal ura and spinal cord passes

spinal cord

the portion of the central nervous system extending from the base of the skull down to L1/L2 in most individuals

spinous process

a portion of a vertebra that is in the mdline and directed posteriorly towards the skin

spondylolisthesis

slippage between two vertebrae

stenosis

narrowing of the spinal canal or foramina

subluxation

slippage between to vertebrae

syringomyelia

the accumulation of fluid withtin the centre of the spinal cord

syrinx

a cavity within the spinal cord typically caused by an accumulation of fluid