Nerves

Question 1

Nerves

Answer 1

The basic unit of the nervous system is a nerve cell or neuron. Bundles of neurons are called nerves in the PNS and tracts in the CNS

Question 2

Structure of a nerve

Answer 2

• Neurons are bound together into bundles by connective tissue called perineurium
• inside the bundles the neurons are surrounded by delicate connective tissue called endoneurium
• the entire nerve is surrounded by a sheath of connective tissue, the epineurium
• an artery and a vein occur between the bundles, to nourish the fibres and remove waste

Question 3

Functions of nerves

Answer 3

Nerves carry impulses from receptors to the CNS and from the CNS to effectors to bring out appropriate responses