The nervous system is the master coordinating system of the body. Every thought, action, and sensation reflext its activity. The structures of the nervous system are described in terms of 2 principal divisions-the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS (brain and spinal cord) interprets incoming sensory information and issues instructions based on past experience. The PNS (cranial and spinal nerves and ganglia) provides the communication lines between the CNS and the body's muscles, glands, and sensory receptors. The nervous system is also divided functionally in terms of motor activities into the somatic and autonomic divisions. It is important, however, to recognize that these classifications are made for the sake of convenience and that the nervous system acts in an integrated manner both structurally and functionally.
| 1958484189 | Central nervous system | Nervous system subdivision that is composed of the brain and spinal cord- interprets/delivers information from/to target parts of the body | 0 | |
| 1958484190 | Somatic nervous system | Subdivision of the PNS that controls voluntary activities such as the activation of skeletal muscles. | 1 | |
| 1958484191 | Autonomic nervous system | Subdivision of the PNS that regulates the activity of the heart and smoot muscle, and of glands; it is also called the involuntary nervous system. | 2 | |
| 1958484193 | Peripheral nervous system | A major subdivision of the nervous system that serves as communication -linking all parts of the body to the CNS. | 3 | |
| 1958484199 | Neurons | Specialised cell that transmits electrical message from one area of the body to another area. |  | 4 |
| 1958484200 | Dendrite | Branches part of neuron receives impulses from other neurons. Conducts electrical currents toward the cell body. |  | 5 |
| 1958484194 | Myelin sheath | Increases the speed of impulse transmission. | 6 | |
| 1958484195 | Cell body | Location of the nucleus. | 7 | |
| 1958484201 | Axon | Generally conduct impulses away from the cell body. | | 8 |
| 1958484196 | Stimulus | A change in the environment | 9 | |
| 1958484202 | Hypothalamus | Regulates functions like body temp, water balance, appetite, sleep patterns (and hormones- from the pituitary gland) linked to emotion. |  | 10 |
| 1958484203 | Pons | Contains reflex centers involved in regulating respiratory rhythm] Structure #7 |  | 11 |
| 1958484204 | Cerebellum | Responsible for the coordination of muscles and is the center of balance Structure #8. | | 12 |
| 1958484205 | Thalamus | Important relay station for fibers traveling to the sensory cortex. Coordinates sensory messages Structure #2 | | 13 |
| 1958484206 | Medulla oblongata | Part of the brainstem that controls vital life-sustaining functions such as heartbeat, breathing, blood pressure, and digestion. Structure #6 | | 14 |
| 1958484208 | Frontal lobe | Largest and longest lobe- involved with planning, problem-solving, personality, decision making, controlling emotions and speech production. Colored blue. |  | 15 |
| 1958484197 | Cerebrospinal fluid | clear watery liquid separating the middle and inner layers of the brain. | 16 | |
| 1958484209 | Cerebrum | Largest part of the brain. Divided into lobes. | | 17 |
| 1958484210 | Temporal lobe | Where the processing centers for smell and hearing are located. Green in the image. | | 18 |
| 1958484211 | Occipital lobe | Where the processing centers for vision are located. Red/pink in the image. | | 19 |
| 1958484212 | Parietal lobe | Where the processing centers for speech, taste and reading are located. Yellow in the image. | | 20 |
| 1958484198 | Spinal cord | An extension of the brain stem- Bundles of neurons carry impulses from all parts of the body to/from the brain (Reflex arcs are housed here as well)0 | 21 |
