Spinal cord and reflex action

• Spinal cord is a long cylindrical and tubular structure present in the cavity of vertebral column
• Contains cavity at centre called Central canal which is connected with 4^th ventricle of Medulla oblongata.
• Grey matter is distributed at centre and white matter at periphery.
• Dorsal elongation of grey matter is called Dorsal horn and ventral elongation is called Ventral horn.
• Contains ascending and descending tract. Ascending tract conduct impulse to brain and descending tract conduct from brain to spinal cord.
• Main site of Reflex action.