Chapter 12 Flashcards
Increases most metabolic rates.
Sympathetic devision
Which neurons are classified by function?
Motor neurons
Sensory neurons
Interneurons
Nerves atatched to the brain
Cranial nerves
Nerves atatched to spinal cord
Spinal nerves
Includes all the neural tissue in the body
Nervous system
Has cytoplasm around nucleus
Perikaryon
Fingerlike extensions of axon that leads to synaptic knob
Telodendria
Carry impulses from CNS to peripheral nerves
Efferent division
Types of sensory neurons
Proprioceptors
Exterroceptors
Interoceptors
Is the round area at the end of neuron where vesicles are located
Synaptic Knob
Form a myelin sheath around every peripheral axon
Schwann Cells
Highly branched processes that stick out fro the nerve body
Dendrites
Thickened region between body and axon
Axon hillock
Carries information from CNS to peripheral effectors
Motor neurons
Has the synaptic terminal and sends a message
Pre synaptic
________ neurons provide information about the external environment in forms of touch, temperature, sight, smell, and hearing.
Exteroceptors
In this classification of neurons, cell body is located between one dendrite and one axon.
Bipolar
Is the synapse between a neuron and a gland
Neuro glandular junction
Functions of astrocytes? (3)
- Maintains blood brain barrier
- Creates a framework for CNS
- Controls interstitial environment by regulating ions, CO2 and other nutrients
Neuroglia is found where?
PNS and CNS
__________ is found in CNS; important in attention disorders and emotional states.
Serotonin
Decreases most metabolic rates; slows body down.
Parasympathetic division
Is gray area; clusters of rough endoplasmic reticulum and fixed ribosomes.
Nissl bodies
Cell membrane of axon
Axolemma
Is found in brain and CNS; may have either excitatory or inhibitory effect
Dopamine
Block the breakdown of ACH by acetylcholinesterase, which produces a long constant contraction.
Anticholinesterase drugs.
Forms cytoskeleton of cell
Neurofilaments and neurotubules
Has slinder extensions but bodies are smaller than astrocytes and can myelinate up to 50 axons in a bundle
Oligodendrocytes
If damage occurs to a nerve in PNS, then schqann cells repair nerve using _________________
Wallerian degeneration
Is the lease numerous and smallest neuroglia and appears early in embryonic development.
Microglia
Are colloidal and columnar cells which line the central nervous canal
Ependymal cells
The areas of axons that are not myelinated are called _____
Nodes of ranvier
The regions of myelinated axons constitute the _____
White matter
