Chapter Three Flashcards
nervous system divided into ________________ and ________________ nervous systems
central; peripheral
Peripheral nervous system is divided into ______________ and _______________.
autonomic; somatic
Autonomic nervous system is divided into ________________ and ______________ (define).
sympathetic (arousing); parasympathetic (calming)
The peripheral system includes ___ cranial nerves and ___ spinal nerves.
13; 31
CNS begins at ___ weeks after conception with ectoderm.
2
head-to-tail
rostrocaudal
_____________ line the inside of neural tube and generate all nerve cells and glia
neuroblasts
first movements due to spontaneous activity in the spinal cord is at ____ weeks.
7.5
By ___ weeks, brain is differentiated into hindbrain, midbrain, and forebrain.
11 weeks
T/F: Almost all neurons were formed in the first 28 weeks.
True
At 38 weeks, the brain weighs about ______ grams, which is ___ the size of an adult brain
350; 1/4
T/F: Axons and dendrites at birth are immature, whereas gyri and sulci are mostly formed. This leads to a darker picture on fMRI scans.
True
migration
the movement of neurons driven by immunoglobulins and chemokine
differentiation
the process where the neuron develops dendrites, axons, and synapses
synaptogenesis
formation of synapses
