LB 3-12 Flashcards
Neurons between sensory and motor neurons, process information, found only in the CNS, multipolar, 99% of neurons
interneurons
Three functional types of neurons
sensory, motor, and interneurons
Two classification of nervous system
structural and functional
Two branches of the Structural Nervous System
Central Nervous System and Peripheral Nervous System
Portion of the Structural Nervous System composed of the brain and spinal cord
Central Nervous System
Portion of the Structural Nervous System composed of named nerves (including cranial nerves) and ganglia
Peripheral Nervous System
Groups of neuron cell bodies in the PNS
Ganglia
Two branches of Functional Nervous System
Sensory Nervous System and Motor Nervous System
Nervous system that detects, send signals to brain
Sensory Nervous System
Neurons that send signals to brain
Afferent neurons
Which nervous system is afferent
Sensory Nervous System
Which nervous system is efferent
Motor Nervous System
Two branches of the Sensory Nervous System
Somatic Sensory, Visceral Sensory
Nervous system for conscious sensory, known feelings
Somatic Sensory
Nervous system for not conscious sensory
Visceral Sensory
Nervous system that detects eg sight, hot/cold, tasting, pain
Somatic Sensory
Nervous system that detects eg blood values like calcium, glucose
Visceral Sensory
Nervous system that acts, sends signals from brain
Motor Nervous System
Neurons that send signals from brain
Efferent Neurons
Two branches of the Motor Nervous System
Somatic Motor, Autonomic Motor
Nervous system for voluntary motor
Somatic Motor
Nervous system for non-voluntary motor
Autonomic Motor
Nervous system that does eg move arms, breathing, blinking
Somatic Motor
Nervous system that does eg heart rate, mouth watering, going to bathroom, release of insulin/adrenaline, pupil dilation
Autonomic Motor
Two branches of the Autonomic Motor System
Sympathetic, Parasympathetic
Nervous system for fight or flight emergency
Sympathetic
Nervous system for rest and digest
Parasympathetic
Test questions
What type of neuron carries blank signal from point A to point B?
Polarity of neurons that is most common- 99%
multipolar
All interneurons are __________
multipolar
All motorneurons are _________
multipolar
Polarity of sensory neurons for vision and hearing
Bipolar
Polarity of all somatic sensory neurons
Unipolar
Polarity of neurons that we know little about, in Central Nervous System, no axon
anaxonic
Mnemonic for remembering sensory and motor functions
motor in front, sensory in back
Four types of cells in the CNS
astrocytes, ependymal cells, oligodendrocytes, microglial cells
Two types of cells in the ONS
schwann cells, satellite cells
Substance that is a pass key to get past the blood-brain barrier
Sulphur
Cells that are the structural framework for the CNS
astrocytes
Cells that create, monitor, and move cerebrospinal fluid
ependymal cells
Cells of the CNS that are ciliated
ependymal cells
Cells in the CNS that create the myelin sheath in the CNS
oligodendrocytes
Cells that are insulation for neurons
myelin
Cells in the PNS that create the myelin sheath
schwann cells
Cells in the PNS that protect and nourish neurons
satellite cells
Insulation for neurons
myelin
Neurons (axons) that are not completely covered by myelin
unmyelinated
Axons wrapped in myelin
myelinated
Type of neurons that conduct more slowly
unmyelinated
Conduction process for unmyelinated axons
continuous conduction
Axons that conduct faster
myelinated
Conduction process for myelinated axons
saltatory
Autoimmune disease that affects the myelin sheath in the CNS
multiple sclerosis
Type of cells affected by multiple sclerosis
oligodendrocytes
Disease that affects the peripheral system, loss of myelin due to inflammation, uncommon, self-resolving, temporary, typically caused by a vaccine reaction
Guillain-Barre Syndrome
Steps to Axon regeneration
(1) Axon is damaged, (2) Distal nerve dies, (3) Schwann cells grow a new tube, (4) Nerve grows through tube, (5) Nerve reconnects
Disintegration (death) of the distal axon and myelin sheath
Wallerian degeneration
Nerve insulation that encloses bundles of axons
perineurium
Nerve insulation that Encloses individual axons
endoneurium
Nerve insulation that Encloses entire nerve (group of neurons)
epineurium
Anatomical definition of group of neurons
nerve
What is the nervous system composed of
brain, spinal cord, nerves, ganglia
What are the two types of cells found in nervous tissue
neurons, neuroglial cells
What are the special characteristics of neurons
Excitability, conductivity, extreme longevity, amitotic
Astrocytes, Ependymal, Microglia, Oligodendrocytes
glial cells of the CNS
Nurture, protect, support, and guide neurons, starlike shape due to projections from their surface, most abundant glial cell in the CNS
Astrocytes
Cells are ciliated simple cuboidal or simple columnar epithelial cells that line the internal cavities (ventricles) of the brain and the central canal of the spinal cord
Ependymal cells
Small cells that have slender branches extending from the main portion of the cell, smallest percentage of CNS glial cells, phagocytic cells of the immune system
Microglia
Large cells with a bulbous body and slender cytoplasmic extensions or processes, extensions wrap around and insulate axons within the CNS to form a myelin sheath
Oligodendrocytes
What are the glial cells of the PNS
satellite cells, neurolemmocytes
Flattened cells arranged around neuronal cell bodies in a ganglion that physically separate cell bodies from their surrounding interstitial fluid, insulate the cell body and regulate exchange of nutrients
Satellite cells
Elongated and flattened cells wrap around and insulate axons within the PNS to form a myelin sheath
Neurolemmocytes
Another name for neurolemmocytes
schwann cells
Glial cell tumors, may be benign or malignant
glioma
Insulating covering around the axon that consists of repeating concentric layers of plasma membrane of glial cells
myelin
What function does myelin perform
insulates axon and allows for faster propagation of nerve signal
An autoimmune disorder that is progressive demyelination of neurons in the central nervous system accompanied by the destruction of oligodendrocytes
Multiple Sclerosis
A disorder in which inflammation causes loss of myelin from the peripheral nerves and spinal nerve roots. It is characterized by muscle weakness that begins in the distal limbs, but rapidly advances to involve proximal muscles as well
Guillain-Barre syndrome
Clusters of neuron cell bodies located along nerves in the PNS
ganglion
Bundles of axons within the CNS in which the axons have a similar function and share a common origin and destination
tract
Bundle of axons in the PNS
a nerve