Across
- 1. the nervous system outside the brain and spinal cord.
- 2. a gap in the myelin sheath of a nerve, between adjacent Schwann cells.
- 3. a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
- 4. are sensory neurons that carry nerve impulses from sensory stimuli towards the central nervous system and brain, while different neurons are motor neurons that carry neural impulses away from the central nervous system and towards muscles to cause movement.
- 6. the complex of nerve tissues that controls the activities of the body. In vertebrates it comprises the brain and spinal cord.
- 8. refers to the axon endings that are somewhat enlarged and often club- or button-shaped.
- 9. a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.
- 12. a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body.
- 14. is a specialized area of membrane of the axon terminal that faces the plasma membrane of the neuron or muscle fiber with which the axon terminal establishes a synaptic junction.
- 15. This system is the primary mechanism in control of the fight-or-flight response.
- 17. are the central nodes of neural circuits, enabling communication between sensory or motor neurons and the central nervous system (CNS).
- 18. a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.
- 19. also called the soma, is the spherical part of the neuron that contains the nucleus.
- 20. is the membrane that receives a signal (binds neurotransmitter) from the presynaptic cell and responds via depolarisation or hyperpolarisation.
- 23. are cells within the nervous system that transmit information to other nerve cells, muscle, or gland cells.
- 24. also known as Nissl substance and Nissl material, is a large granular body found in neurons.
- 25. is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles. It consists of afferent nerves or sensory nerves, and efferent nerves or motor nerves.
Down
- 1. . After release into the synaptic cleft, neurotransmitters interact with receptor proteins on the membrane of the postsynaptic cell, causing ionic channels on the membrane to either open or close. ... There are two types of postsynaptic receptors that recognize neurotransmitters.
- 5. also called motor neurons – are the nerves responsible for carrying signals away from the central nervous system in order to initiate an action.
- 7. a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure.
- 10. is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances.
- 11. are a type of glial cells of the peripheral nervous system that help form the myelin sheath around the nerve fibers. Myelin sheath of the neuron.
- 13. a sensory receptor which receives stimuli from within the body, especially one that responds to position and movement.
- 16. another term for glia.
- 21. also called nerve fibre, the portion of a nerve cell (neuron) that carries nerve impulses away from the cell body.
- 22. a thing or event that evokes a specific functional reaction in an organ or tissue.