Nervous System Flashcards
collect info from other neurons
dendrites
contains the nucleus and most cell organelles
cell body
integrates info collected by dendrites and initiates nerve impulses at the beginning of the axon
axon hillock
conducts action potential away from the cell body
axon
nerve cells that are excitable = generate and transmit electrical signals, more specifically action potentials
neurons
modulate neuron activity (provide support)
glia
at the tip of the axon that carries Ap away from presynaptic cell to postsynaptic cell
axon terminals
originating cell body
presynaptic cell
receiving target cell
postsynaptic cell
cluster of nerve cells
ganglion (ganglia)
ganglia may be enlarged and fused at the anterior end to form a –
brain
cnidarians have simple networks of neurons called – that achieves little or no integration of information
nerve nets
in bilaterally symmetric animals, the ganglia are often –
paired
The increase in brain size in humans is mostly due to an increase in the –
cerebral cortex
the human brain is also highly – and more of it is devoted to associative functions
convoluted
In – body size and brain size are correlated, but higher primates fall above this regression line
vertebrates
In humans, the – is the largest brain area and is made even larger by convolutions
cerebral cortex
The anterior end of neural tube develops into –
hindbrain, midbrain, and forebrain
most “primitive” part of the brain that controls breathing and circulation and helps regulate behavior patterns
hindbrain
processes visual and auditory info (eg reflexive response to noise)
midbrain
most complex and developed portion of the brain
forebrain
the posterior end of neural tube develops into
spinal cord
the hindbrain becomes
medulla, pons, and cerebellum
controls physiological functions such as breathing
medulla and pons