Study Guide Chapter 13
The glial cells that guide migrating neurons in the developing fetal brain are __________.
Astrocytes
In the peripheral nervous system, the somas of the neurons are concentrated in enlarged, knotlike structures called ______ connected to the nerves.
Ganglia
Neurons that convey informations to the CNS ar called sensory, or _______, neurons.
Afferent
Prenatal degeneration of the forebrain results in a birth defect called ________.
Anencephaly
A/An ________ synapse is formed when a presynaptic neuron synapes with the cell body of a postsynaptic neuron.
Axosomatic
The soma of a mature neuron lacks _______.
Centrioles
Neurons receive incoming signals by way of specialized processes called ________.
Dendrites
Neurons arise from embryonic __________.
Ectoderm
The integrative functions of the nervous system are performed mainly by _____.
Interneurons
The glial cells that destroy microorganisms in the CNS are _________.
Microglia
Another name for the axon of a neuron is _______.
Nerve fiber
The _____ and _______ are necessary for regeneration of damaged nerve fibers in the peripheral nervous system.
Neurilemma, endoneurium
In the central nervous system, cells called ________ perform one of the same functions that Schwann cells do in the peripheral nervous system.
Oligodendrocytes
A friend takes a flash photograph of you, and you continue to see an image of the flash unit forf several seconds afterward. This phenomenon is the result of a ________ circuit.
Parallel after-discharge
All of the nervous system except the brain and spinal cord is called the _______.
Peripheral nervous system
At a given synapse, the _______ neuron has neurotransmitter receptors.
Postsynaptic
Motor effects that depend on repetitive output from a neural pool are most likely to use the ________ type of neural circuit.
Reverberating
Which of the following appears earlier than all the rest in prenatal development of the nervous system: the neural groove, the primary vesicles, the neural plate, the neural crest, and the neural tube.
The neural plate
Neurotransmitters are found in ________.
The synaptic knob
Nerves that directly control the motility of the stomach or rate of the heartbeat would belong to ________.
The visceral motor division