nervous16ab.notebook March 23, 2018

What are the 3 parts of the NERVOUS SYSTEM?

Nervous System

Nerve Cells Neuron Receptors Effectors

Receptor -organs or cells that detect stimuli and convert the stimuli to impulses. Effector A structure that carries out the response to a stimulus [Example: Muscle& Gland]

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Sense organs and receptors The five sense organs: 1)______Ear [cochlea] [mechanoreceptor

2)______Mouth [tastebuds] [Chemoreceptors]

Eyes [Retina] 3)______[Photoreceptor]

[thermo­Receptors Skin 4)______Pressure Receptors https://www.youtube.com/watch?v=E4Ep1atfFlg Pain Receptors

5)______

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Stimulus Receptor Effector (light) (cells in the eye)

Effectors: muscles or glands that respond to nervous impulses

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There are three types of neurons 1)Sensory Neuron­ carries impulses from the sense organs to the spinal cord or brain. (CNS)

2) Motor Neuron­ carries impulses from the brain and spinal cord to muscles and glands(effectors)

3) Interneurons ­connect sensory and motor neurons and carry impulses between them. Most are located in the brain and spinal cord(CNS)

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What is a nerve?

A bundle of neurons surrounded by connective tissue

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Human Nervous System

Central Nervous Peripheral Nervous System System consists of consists of The Brain and Spinal All nerves outside the CNS. Sensory and Motor Cord Neurons All Nerves that come off the brain & spinal cord -cranial nerves -Nerves coming off the brain -spinal nerves -Nerves coming off the spinal cord

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What are the 2 DIVISIONS of the Nervous System ?

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Central Nervous System What protects the brain?

l. Skull -bone 2. Meninges membranes that protect the brain 3. Cerebrospinal fluid fluid surrounding brain &sp. cord that protects & nourishes the brain

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Brain Cerebrum

Cerebellum

Medulla Oblongata

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Cerebrum: • the largest part of the brain. • Center for thinking, memory and voluntary activities, and senses

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Cerebellum: • coordinates motor activities • helps maintain balance

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Medulla Oblongata: controls many involuntary activities including breathing, heartbeat, and blood pressure

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hypothalamus- Link between the nervous and endocrine system -helps regulate body Temperature -It helps to regulate appetite, thirst Blood pressure, sleep, and emotions

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Thalamus

consciousness, sleep, and sensory interpretation.

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Spinal Cord 1) vertebrae (bones)

What protects the spinal cord? 2) meninges (membranes) 3) Cerebrospinal fluid.

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Spinal Cord: A Thick nerve a) It carries nerve impulses between the brain and other structures of the body.

b) controls certain reflexes (automatic responses to stimuli)

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Neurons_.asf The_Poli.asf