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Human Nervous System Level3

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Human Nervous System Level3. By Graciela Garcia . Functions of the Nervous System:. B rain detects changes in the environment externally and internally Brain stores information Brain responds by starting changes in the nerves and glands Maintains homeostasis Brain processes signals.

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Human Nervous System Level3

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  1. Human Nervous System Level3 ByGraciela Garcia

  2. Functions of the Nervous System: • Brain detects changes in the environment externally and internally • Brain stores information • Brain responds by starting changes in the nerves and glands • Maintains homeostasis • Brain processes signals

  3. The cross section layers of the brain: • Longitudinal Tissue -Separates brain medially • Lateral Tissue -Separates temporal and frontal lobes. • Central Sulcus -Separates frontal and parietal lobes

  4. Divisions of the Nervous System: Central Nervous System Peripheral Nervous System Autonomic -Controls are involuntary -Blood flow, digestion, and heart Beat Somatic (not automatic) -Chewing, walking, and running -Brain -Spinal Cord

  5. The four lobes

  6. Description of the four lobes of the brain: • Frontal Lobe • Reasoning • Planning • Problem Solving • Thinking • Parietal Lobe • Recognizing • Stimuli orientation • Speech • Temporal Lobe • Memory • Speech • Auditory stimuli • Occipital Lobe • Visual Processing • Hallucinations

  7. Spinal Nerves: • Sacral Tailbone Spinal nerves: 5 -Innervate posterior legs and buttocks • Thoracic Chest Spinal Nerves: 12 -Innervate trunk and parts of arms • Cervical Neck Spinal nerves: 8 -Innervate back of head, upper back, and neck • Lumbar Lower back Spinal nerves: 5 -Innervate lower abdomen and anterior legs

  8. Diagram

  9. Cranial Nerves: -Olfactory: the sense of smell -Optic: does the vision -Abducent: abduction of the eye -Facial: Facial expressions, saliva, tears, and taste

  10. The Neuron & it’s Parts: • A neuron is a nerve cellthat forms chains that go through-out your whole body including the brain PARTS OF A NEURON: • Dendrite (receives transmitters from environment) • Cell Body (contains nucleus, and is largest part of cell) • Nucleus (in cell body and contains DNA) • Axon (tube that sends signals from cell body to axon terminal) • Myelin Sheath (lipid [fat] that keeps chemicals inside axon to speed up transmission of the signal) • Axon Terminal (end of axon where neurotransmitters are released) • Neurotransmitters: chemical released into synaptic elect and to attach themselves to receptors on next neuron) • Synaptic Cleft: gap between neurons)

  11. Neuron

  12. Flow of the CSF: • Cerebrospinal Fluid – Clear fluid that is made in the spaces of the brain and circulates around the brain and spinal cord to cushion the brain and gives it nutrients. -Some made in choroid plexus of lateral ventricle in brain -Travels through interventricular forearm to 3rd ventricle -Travels through 4th ventricle through cerebral aqueduct • Some travels to surround whole brain • Some travel to spinal cord • Absorbed by the arachnoid villi and filtered with the blood

  13. The flow of CSF

  14. Meninges: • Skin of scalp • Greater density of hair follicles • Periosteum • Connective tissue layer • Bone • Duramater • Arachnoid • Piamater

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