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The Nervous System
Transcript of The Nervous System
its made up of the brain and spinal cord. A division of the ANS that returns the body to resting levels following adjustments to stress. neurons are the functional units of the nervous system. They are a nerve cell that conducts nerve impulses.
Dendrites are projections in the cytoplasm in the structure of the neuron. They carry nerve impulses toward the cell body.
Axon is an extension of the cytoplasm that carries impulses away from the cell body.
Myelin Sheath is the insulated covering over the axon of a nerve cell.
Schwann Cell is a special type of glial cell that produces the myelin sheath.
Nodes of Ranvier are regularly occurring gaps between sections of myelin sheath along the axon. Neurons: Relays information received by sensory receptors about the external or internal environment to the central nervous system for processing. Sensory Neuron: Found only in the brain and spinal cord. Link neurons to other neurons, such as sensory neurons to outgoing motor neurons. Interneurons: Motor Neurons: Relay information to the cell or organ that responds to the stimulus, also known as the effectors. Voluntary control. Ex, Skeletal, muscle, bones, skin, and sense organs. BRAIN
- meninges : Protective Membrane that surrounds the brain and spinal cord.
- cerebrospinal fluid : circulates between the inner, middle membranes acts as a cushion. .
- cerebrum - stores sensory information and begins voluntary motor activities
-cerebral cortex: the outer layer of the cerebral hemispheres, the two hemispheres are connected by the corpus callosum allowing info to be shared between the hemispheres (a collection of nerve fibers
-corpus callosum: a nerve tract that allows communication between the two cerebral hemispheres
-Hypothalamus: maintains body's internal equilibrium
-pons: the ron of the brain that acts as a relay station by sending a nerve message between the cerebrum and the medulla
-medulla oblongata: joins the spinal cord to the cerebellum and the site of autonomic nerve control
-cerebellum: the region of the brain that coordinates muscle movement Functions: LOBES
-Frontal Lobe: Controls movement of voluntary muscles
-Temporal Lobe: Controls sensory areas associated with vision and hearing
-Parietal Lobe: Controls touch and temperature awareness
Occipital Lobe: Controls vision and interprets visual information