Exm 3 (ch 12) Flashcards
What is in the central nervous system?
Brain and spinal cord
What is in the peripheral nervous system? 
Cranial nerves, spinal nerves, enteric plexuses in the small intestine, and sensory receptors in the skin 
Motor output of the PNS
Autonomic Nervous System(involuntary) —>sympathetic division, parasympathetic, and enteric plexuses
Sympathetic—> “fight or flight” —> smooth, muscle, cardiac muscle, and glands
Parasympathetic —> “rest and digest”—> smooth, muscle, cardiac muscle, and glands
Enteric plexuses—> “rest and digest”—> smooth muscles, and glands of the digestive canal
Somatic Nervous System(voluntary)—> skeletal muscle
Sensory input for PNS
Somatic senses and special senses
Analyze incoming sensory information, store some aspects, and make decisions regarding appropriate behaviors
Integrative
Respond to stimuli via effectors and control of muscles/glands, maintain homeostasis in autonomic nervous system
Motor
bundle of axons that lies outside the brain and spinal cord
Nerves (in PNS)
fibers bring information to the CNS from general/somatic
and special senses
Sensory (afferent) (in PNS)
fibers conveys information from the CNS to effectors (muscles and glands)
• Autonomic vs. somatic
Motor (efferent)
Afferent
Senses
Efferent
Motor
conveys information from the CNS to skeletal muscle ONLY, voluntary
Somatic(SNS)
from the CNS to smooth muscle, cardiac muscle, and glands, involuntary
Autonomic(ANS)
“fight or flight” response
Sympathetic
“rest and digest” response
Parasympathetic
network of neurons controlling digestion, can function
independently but still interacts with other branches of the ANS
Enteric plexuses
What is the functional cell of nervous tissue?
Neurons
Neural impulse through neurons are called
Action potentials
receives electrical signals
Dendrites
contains nucleus and organelles
Cell body
clusters of rough ER and free
ribosomes
Nissl bodies
where the axon joins the cell body in a cone-shaped elevation
Axon hillock
propagates nerve impulses towards another neuron
Axon
unipolar/pseudounipolar are sensory or motor?
SENSORY
What cells are found in the cerebellum in dendritic branching
Purkinje cells
What cells are found in the
cerebral cortex in dendritic branching
Pyramidal cells
usually unipolar
o Conveys information to the CNS
Sensory/Afferent neurons
usually multipolar
o Conveys action potential from the CNS
Motor/Efferent neurons
usually multipolar
o Process sensory information and elicit motor response
Interneurons/Association neurons
Support the CNS
Neuroglia
tumors from glia that are super malignant and grow rapidly
Gliomas
Neuroglia: astrocytes, oligodendrocytes, microglia, ependymal cells PNS or CNS?
CNS
Neuroglia: Schwann cells and satellite cells
CNS or PNS?
PNS
many extensions like a star, uses
extensions to wrap around, bind, and provide structural support to the CNS
Astrocytes
line the CNS fluid filled cavities (ventricles of the brain and central canal of the spinal cord) and are the epithelial cells of the CNS, produce cerebrospinal fluid (CSF) from the choroid plexus
Ependymal cells
produce myelin “white matter”
• One of these produces myelin for several different axons
Oligodendrocytes
removes cellular debris,
phagocytoses microbes and damaged tissue
Microglia
produce myelin sheath in the PNS
• A single of these cells produces myelin for only one axon
Schwann cells (neurolemmocyte)
surround cell bodies of
neurons in the PNS ganglia and
regulate the exchange of materials between neuronal cell bodies and interstitial fluid
Satellite cells