SLD- Ch 3 Flashcards
neuron
nerve cell, is the basic unit of the nervous system
synapse
Neurons are close enough to enable chemical‐electrical impulses to “jump” in the miniscule space between the axon of one neuron and the dendrites of the next
central nervous system (CNS)
brain and spinal cord
peripheral nervous system (PNS)
Any neural tissue outside the CNS; conducts impulses either toward or away from the CNS
afferent
Nerves that conduct messages toward the brain
efferent
Nerves that conduct messages away from the brain
brainstem
At the top of the spinal cord consisting of the medulla (emanates at the superior end of the spine), pons (middle), and midbrain (most superior, curls & points to frontal lobe); These structures regulate involuntary functions, such as breathing and heart rate
reticular formation
integrates sensory inputs and inhibits or facilitates sensory transmission.
thalamus
relays incoming sensory information (except for smell) to the brain and prepares the brain to receive input
cerebellum
controls equilibrium and is responsible for regulating motor and muscle activity by acting on the messages sent from “higher up.” Now believed to process some language and higher-level cognitive and emotional functions
cerebrum
larger, “thinking” part of the brain and lies above the is divided into left and right hemispheres
cortex
white fibrous connective tracts made primarily of nerve cell bodies
Association fibers
run between different areas within each hemisphere
Projection fibers
connect the cortex to the brainstem and below
Transverse fibers
connect the two hemispheres; The largest transverse tract is the corpus callosum
Regulation
refers to the amount of “attention” the cortex needs to function
Processing
information analysis, coding, and storage
Formulation
creation of intentions and behavior
contralateral
each hemisphere is concerned with the opposite side of the body, with the exception of vision and hearing
Right Hemisphere
capable of recognizing printed words but has difficulty decoding; comprehension and production of speech prosody and affect; metaphorical language and semantics; and comprehension of complex; pragmatics, including the perception and expression of emotion in language, the ability to understand jokes, irony, and figurative language, and the ability to produce and comprehend coherent discourse.
Left Hemisphere
specialized for language in all modalities, linear order perception, arithmetic calculations, and logical reasoning; dominant for control of speech and non-speech-related oral movements and for math and language processing; adept at perceiving rapidly changing sequential information, such as acoustic characteristics of phonemes in speech
Brain Maturation
Brain weight triples during the first two years of life; By age 12, the brain has usually reached its full weight; Sequence of neural development includes:Weight gain,Myelination of sensory and motor tracts, Cell differentiation