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Nervous System Brain Spinal Cord Nerves Neurons.

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Presentation on theme: "Nervous System Brain Spinal Cord Nerves Neurons."— Presentation transcript:

1 Nervous System Brain Spinal Cord Nerves Neurons

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3 Parts of a Neuron Soma – cell body Dendrite – receive messages Axon – send messages out Myelin – help speed up messages, made up of Schwann cells

4 Types of Neurons Sensory – incoming signals Motor - movement Interneurons – in brain and spinal cord only (processors/relay terminals)

5 Neural Connections Synapse – space between axon of neuron A and dendrite of neuron B Neurotransmitter – chemicals that diffuse across synapse to change polarity of neuron Bs dendrite membrane

6 Central Nervous System Brain Spinal Cord Control center, coordinates body functions

7 Peripheral Nervous System Carry messages to and from CNS Motor and sensory neurons found here. No interneurons here!

8 Brain Cerebrum Corpus Callosum Pituitary Gland Hypothalamus Brain Stem: Pons, Midbrain, Medulla Oblongata Cerebellum Thalamus

9 Autonomic Nervous System Involuntary Two divisions –Sympathetic – fight-or-flight responses –Parasympathetic – body at rest

10 Somatic Nervous System Cranial and spinal nerves Reflexes – automatic responses to stimuli

11 Senses Chemoreceptors – chemicals Photoreceptors – light Mechanoreceptors – pressure, vibration

12 Chemoreceptors Taste – taste buds –Sweet –Salty –Bitter –Sour Olfaction - smell

13 Photoreceptors Vision Retina –Cones – color –Rods – black & white

14 Mechanoreceptors Hearing – vibration in cochlea Balance – semicircular canals in ears Touch – pressure, pain, heat, cold


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