AQA A-LEVEL: Biopsychology - Structure of Neurons
STRUCTURE OF NEURONS STRUCTURE CELL BODY which contains a nucleus which has all the genetic material of cell Have DENDRITES which are branch-like structures which carry impulses from other neurones towards the cell body AXON carries impulse AWAY from cell body down the neurone AXON covered in a protective layer MYELIN SHEATH which speeds up electrical impulses MYELIN SHEATH is segmented by gaps called NODES OF RANVIER, which speed up transmissions of impulses as it forces it to jump across the gaps At the end of the AXON, there are TERMINAL BUTTONS which communicate with the next neurone via neurotransmitters Sensory Neurone Unipolar Carries info from PNS to CNS about external and internal environment using sensory receptors Long dendrites and short axons Relay Neurone Multipolar as it can send AND receive info Most common type in CNS allows sensory and motor neurones to communicate and connect Short dendrites and short axons Mo...