The Nervous System
- Created by: hellostudents
- Created on: 13-05-20 13:08
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- The Nervous System
- Divisions of the nervous system
- The nervous system is divided into the Central nervous system (CNS) and Peripheral nervous system (PNS)
- CNS = Spinal cord and Brain
- PNS = Somantic and Autonomic nervous system
- Autonomic nervous system is further divided into the sympathetic and parasympathetic nervous system
- The nervous system is divided into the Central nervous system (CNS) and Peripheral nervous system (PNS)
- CNS
- Sensory receptors (eyes ears skin)
- The spinal cord:
- Relays information between the brain and the rest of the body
- Allows the brain to monitor and regulate bodily processes e.g digestion and breathing
- Contains circuits of nerve cells that enable us to perform simple reflexes without direct involvement from the brain
- Relays information between the brain and the rest of the body
- The brain:
- 4 main areas
- The Cerebrum
- Largest part of the brain which is further divided into 4 lobes split into 2 hemispheres
- Frontal lobe is involved with speech and the octal lobe is involved with processing images
- The Cerbellum
- Sits beneath the back of the Cerebrum
- Involved in controlling motor skills and balance
- The Diencephalon
- Lies beneath the cerebrum contains the thalamus (relay station) and the hypothalamus (regulation and also involved with controlling release of hormones)
- The Brain stem
- Responsible for regulating the automatic functions that are essential for life
- The Cerebrum
- 4 main areas
- PNS
- Relays nerve impulses from the CNS to the rest of the body and back to the CNS
- The Somatic nervous system:
- Made up of Cranial nerves and 31 pairs of spinal nerves
- Both have sensory and motor neurons
- Involved with reflex action without the CNS
- Made up of Cranial nerves and 31 pairs of spinal nerves
- The Autonomic nervous system:
- Involuntary actions like your heart beating and digestion are regulated by the ANS
- Without being consciously aware of them happening
- The Sympathetic nervous system:
- Primarily involved in responses that help deal with emergencies
- Increasing heart rate and blood pressure and dilating blood vessels in muscles
- Neurons from the SNS travel to almost every organ and gland within the body preparing the body for necessary when individual is under threat
- Causes the body to release stored energy, pupil dilate and hair stands up and slows bodily processes like digestion and urination
- Primarily involved in responses that help deal with emergencies
- The Parasympathetic nervous system:
- Relaxes the individual after the emergency has passed
- Slows heart rate and BP
- Digestion begin again
- Involved with energy conservation and digestion
- Involuntary actions like your heart beating and digestion are regulated by the ANS
- Divisions of the nervous system
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