The _______ body has four limbs (two arms and two _______), a head and a neck which connect to the torso. The body’s shape is determined by a strong skeleton made of _______ and cartilage, surrounded by fat, muscle, connective tissue, organs, and other structures. The spine at the back of the skeleton contains the flexible ________ column which surrounds the spinal cord, which is a collection of nerve fibres. Nerves _______ the spinal cord and brain to the rest of the _______.