Podcast
Questions and Answers
The visceral nervous system is part of the ______ nervous system.
The visceral nervous system is part of the ______ nervous system.
peripheral
A neuron is composed of three major parts: cell body, ______, and axon.
A neuron is composed of three major parts: cell body, ______, and axon.
dendrites
The ______ is the part of the neuron that transmits nerve impulses away from the cell body.
The ______ is the part of the neuron that transmits nerve impulses away from the cell body.
axon
Myelinated nerve fibers are enveloped with ______ cells.
Myelinated nerve fibers are enveloped with ______ cells.
Neurons are divided into three types: multipolar, ______, and unipolar.
Neurons are divided into three types: multipolar, ______, and unipolar.
The human neural system is divided into two parts: the central neural system (CNS) and the peripheral neural system (PNS), where the CNS includes the brain and the ______.
The human neural system is divided into two parts: the central neural system (CNS) and the peripheral neural system (PNS), where the CNS includes the brain and the ______.
The nerve fibers of the PNS are classified into two types: afferent fibers and ______ fibers.
The nerve fibers of the PNS are classified into two types: afferent fibers and ______ fibers.
The afferent nerve fibers transmit impulses from tissues/organs to the ______.
The afferent nerve fibers transmit impulses from tissues/organs to the ______.
The peripheral nervous system is divided into the somatic neural system and the ______ neural system.
The peripheral nervous system is divided into the somatic neural system and the ______ neural system.
The somatic neural system relays impulses from the CNS to ______ muscles.
The somatic neural system relays impulses from the CNS to ______ muscles.
The autonomic neural system is further classified into two branches: the sympathetic neural system and the ______ neural system.
The autonomic neural system is further classified into two branches: the sympathetic neural system and the ______ neural system.
Visceral nervous system is part of the PNS that comprises nerves and ______ facilitating impulses between the CNS and viscera.
Visceral nervous system is part of the PNS that comprises nerves and ______ facilitating impulses between the CNS and viscera.
The regulatory impulses from the CNS to the concerned peripheral tissues/organs are transmitted by ______ fibers.
The regulatory impulses from the CNS to the concerned peripheral tissues/organs are transmitted by ______ fibers.
Flashcards
Visceral Nervous System
Visceral Nervous System
The part of the peripheral nervous system responsible for communicating with internal organs and glands.
Neuron
Neuron
The basic unit of the nervous system, responsible for transmitting nerve impulses.
Dendrites
Dendrites
Short, branched fibers that extend from the cell body of a neuron and receive signals from other neurons.
Axon
Axon
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Myelin Sheath
Myelin Sheath
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Central Nervous System (CNS)
Central Nervous System (CNS)
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Peripheral Nervous System (PNS)
Peripheral Nervous System (PNS)
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Afferent Nerve Fibers
Afferent Nerve Fibers
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Efferent Nerve Fibers
Efferent Nerve Fibers
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Somatic Nervous System
Somatic Nervous System
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Autonomic Nervous System
Autonomic Nervous System
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Sympathetic Nervous System
Sympathetic Nervous System
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Parasympathetic Nervous System
Parasympathetic Nervous System
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Study Notes
Neural System Divisions
- Human neural system is divided into two main parts:
- Central Nervous System (CNS): Includes brain and spinal cord; site of information processing and control.
- Peripheral Nervous System (PNS): All nerves connected to CNS; carries impulses to and from CNS.
Peripheral Nervous System (PNS) Components
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Nerve Fibers: Two types:
- Afferent fibers: Transmit impulses from tissues/organs to the CNS.
- Efferent fibers: Transmit impulses from the CNS to peripheral tissues/organs.
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Divisions:
- Somatic Neural System: Relays impulses from CNS to skeletal muscles.
- Autonomic Neural System: Carries impulses from CNS to involuntary organs and smooth muscles; further divided into:
- Sympathetic Neural System
- Parasympathetic Neural System
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Visceral Nervous System: Part of PNS; complex of nerves, fibres, ganglia, and plexuses; carries impulses between CNS and viscera.
Neuron Structure and Types
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Neuron: Microscopic structure with three main parts:
- Cell body: Contains cytoplasm with organelles and Nissl's granules.
- Dendrites: Short, branching fibres projecting from cell body; contain Nissl's granules; transmit impulses toward cell body.
- Axon: Long fibre that branches at its end; transmits impulses away from cell body; branches end in synaptic knobs with synaptic vesicles containing neurotransmitters.
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Neuron Types: Based on axon and dendrite number:
- Multipolar: One axon, two or more dendrites; common in cerebral cortex.
- Bipolar: One axon, one dendrite; found in retina.
- Unipolar: One axon, no dendrite; mainly in embryonic stage.
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Axon Types:
- Myelinated: Enveloped by Schwann cells forming a myelin sheath; gaps between sheaths are nodes of Ranvier; found in spinal & cranial nerves.
- Non-myelinated: Schwann cell does not form myelin sheath; found in autonomic and somatic systems.
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