chapter 12 Flashcards
efferent division
motor commands from CNS to PNS
afferent division
sensory info from PNS to CNS
three types of sensory receptors
special sensory, visceral, somatic
special sensory receptors
monitor smell, taste, vision, balance, and hearing
visceral sensory receptors
monitor internal organs
somatic sensory receptors
monitor skeletal muscles, joints, skin surface
main components of neurons
cell body, dendrites, axons
anaxonic neurons
found in brain and sensory organs
bipolar neurons
found in special sensory organs
unipolar neurons
found in sensory neurons of PNS
multipolar neurons
common in CNS and all skeletal muscle motor neurons
sensory neurons
unipolar with cell bodies grouped in sensory ganglia
interneurons
association neurons located between sensory and motor neurons
involved in higher functions (learning and memory)
neuroglia of CNS
ependymal cells, astrocytes, oligodendrocytes, microglia
ependymal cells
circulate and monitor CSF
astrocytes
maintain the blood brain barrier (BBB), provides structural support
oligodendrocytes
myelinate CNS axons, increasing speed of action potentials
microglia
remove cell debris, waste, and pathogens via phagocytosis
neuroglia of PNS
satellite cells and schwann cells
satellite cells
surround neuron cell bodies in ganglia, regulate environment around neurons
schwann cells
form myelin sheath of PNS axons, participate in repair process after injury
