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Questions and Answers
The primary somatosensory area that manages skin sensation is located in which of the following brain lobes?
The primary somatosensory area that manages skin sensation is located in which of the following brain lobes?
Which part of the brain is responsible for managing vision?
Which part of the brain is responsible for managing vision?
What is the function of the auditory cortex located in which brain lobe?
What is the function of the auditory cortex located in which brain lobe?
Which part of the spinal cord is mainly composed of sensory and motor neurons?
Which part of the spinal cord is mainly composed of sensory and motor neurons?
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Which type of tracts in the spinal cord carry information to the brain?
Which type of tracts in the spinal cord carry information to the brain?
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The nerves that carry messages to and from the central nervous system are part of which nervous system?
The nerves that carry messages to and from the central nervous system are part of which nervous system?
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What is the main function of the Somatic Nervous System?
What is the main function of the Somatic Nervous System?
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Which part of the nervous system controls the 'flight or fight' response?
Which part of the nervous system controls the 'flight or fight' response?
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What is the function of Spinal Nerves in the Peripheral Nervous System?
What is the function of Spinal Nerves in the Peripheral Nervous System?
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In which part of the brain do billions of neurons exist, specially intended for information processing and signaling?
In which part of the brain do billions of neurons exist, specially intended for information processing and signaling?
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What is the main function of the nervous system?
What is the main function of the nervous system?
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What is the basic unit of the nervous system that is specially intended for information processing and signaling?
What is the basic unit of the nervous system that is specially intended for information processing and signaling?
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Which part of the nervous system is responsible for carrying nerve impulses?
Which part of the nervous system is responsible for carrying nerve impulses?
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Which part of the Autonomic Nervous System controls the body in times of rest?
Which part of the Autonomic Nervous System controls the body in times of rest?
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What is the average weight of the brain?
What is the average weight of the brain?
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Which part of the brain serves functions related to coordination of movement, sensing, and consciousness?
Which part of the brain serves functions related to coordination of movement, sensing, and consciousness?
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What is the function of the cerebrospinal fluid in the brain?
What is the function of the cerebrospinal fluid in the brain?
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Which part of the central nervous system receives sensory information from all parts of the body?
Which part of the central nervous system receives sensory information from all parts of the body?
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Study Notes
The Nervous System
- The nervous system is the body's control center and communication network, responsible for coordination of movement, response to environmental stimuli, intelligence, self-awareness, thought, and emotion.
Central Nervous System
- Composed of the brain and spinal cord, which acts as the body's control center and coordinates the body's activities.
- The brain contains parts that function in the coordination of movement, sensing, and consciousness, as well as areas that are below the level of conscious control.
- The brain is protected by the cranial bones, cranial meninges, and cerebrospinal fluid, which acts as a shock absorber and circulates nutrients.
- The brainstem is divided into three main parts: diencephalon, pons, and medulla oblongata.
Peripheral Nervous System
- Divided into two main parts: Somatic Nervous System and Autonomic Nervous System.
- Somatic Nervous System carries motor information and sensory information between the skin, sensory organs, and skeletal muscles to the central nervous system.
- Autonomic Nervous System relays information from the central nervous system to organs and is involuntary.
- Autonomic Nervous System is further divided into Sympathetic Nervous System (controls in times of stress) and Parasympathetic Nervous System (controls the body in times of rest).
Neurons
- A nerve cell is the basic unit of the nervous system, and there are billions of neurons in the body.
- Neurons are specialized for information processing and signaling, relaying and receiving messages between the brain and the body.
Brain Lobes
- The four lobes of the brain are:
- Occipital lobe: manages vision
- Temporal lobe: manages hearing and speech
- (Two lobes not specified in the text)
Spinal Cord
- Acts as the nervous system's "superhighway", containing a central canal filled with cerebrospinal fluid.
- Composed of gray matter (inner layer) containing cell bodies of neurons and short fibers, and white matter (outer layer) containing long fibers of interneurons.
Spinal Nerves
- 31 pairs of spinal nerves emerge from the spinal cord, divided into:
- Cervical: 8 pairs
- Thoracic: 12 pairs
- Lumbar: 5 pairs
- Sacral: 5 pairs
- Coccygeal: 1 pair
Reflex and Reflex Arc
- A reflex is an involuntary reaction to an external stimulus, and a reflex arc is the pathway that causes a reflex.
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Description
Learn about the nervous system, the body's control center and communication network responsible for coordination of movement, response to environmental stimuli, intelligence, self-awareness, thought, and emotion. Explore how nerve cells called neurons work to carry nerve impulses. Dive into the central nervous system comprising the brain and spinal cord.
