terminating in a fibrous extension known as the filum terminale.

The human spinal cord is an estimated 45 cm long in average-height males and about 43 cm in average-height females. It is ovoid-shaped and is enlarged in the cervical and lumbar regions. The cervical enlargement, stretching from the C4 to T1 vertebrae, is where sensory input comes from and motor output goes to the arms and trunk. The lumbar enlargement, located between T10 and L1, handles sensory input