Lab Exam 4 (ch 11&12) Flashcards
Facilitate formation of the blood brain barrier in the CNS
Astrocytes
Myelinate axons in the CNS
Oligodendrocytes
Myelinate axons in the PNS
Schwann Cells
Act as phagocytes in the CNS
Microglial Cells
Circulate and secrete cerebrospinal fluid in the CNS
Ependymal Cells
Surround and support cell bodies in the PNS
Satellite Cells
Consists of cranial nerves and spinal nerves
Peripheral Nervous System
Consists only the brain and spinal cord
Central Nervous System
Afferent
Sensory
Efferent
Motor
Voluntary motor control
Somatic nervous system
Visceral involuntary control
Autonomic nervous system
Fight or flight response that mobilizes the body during activity
Sympathetic
Rest and digest state to conserve energy
Parasympathetic
A groove or furrow, especially within the surface of the brain
Sulcus
A ridge or cleft between two clefts on the central surface of the brain
Gyrus
A deeper groove on brain
Fissure
the primary commissural region of the brain consisting of white matter tracts that connect the left and right cerebral hemispheres.
Corpus callosum
planning and executing movement,
complex mental processes (conscience,
personality, problem solving)
Frontal lobe
processing and integrating
sensory information, attention
Parietal lobe
hearing, smell, memory, emotion, some language aspects
Temporal lobe
primary visual cortex
Occipital lobe
lots of effects. seen by prying the frontal, parietal, and temporal lobes apart; taste and visceral sensations
Insula (lobe)
Broca’s Area location and function
Frontal lobe and language production
Wernicke’s area function and location
Temporarl lobe and language comprehension
separates two sides of brain
Longitudinal fissure
Frontal lobe is separated by the
Central sulcus
The most posterior part of the frontal lobe is the
Precentral gyrus
The most anterior part of the parietal lobe is the
Postcentral gyrus
Temporal lobe is separated by the
Lateral sulcus/fissure
The ______ are paired masses of gray matter in each cerebral hemisphere that coordinate movement
Basal nuclei
The limbic system include
Hippocampus and amygdala
memory and learning
Hippocampus
plays a role in behavioral expression and emotion
Amygdala
controls information entry into the cerebral cortex; edits, sorts and routes stimuli
Thalamus
regulates autonomic nervous system
• Sleep/wake cycle
• Thirst/hunger
• Body temperature
• Hormone production
• Controls secretion from the pituitary gland
Hypothalamus
processes and routes visual and
auditory stimuli to the thalamus, motor fibers from cerebral cortex, monitors movement from basal nuclei
Midbrain
breathing, reflexes, sleep/wake cycle
Pons
white matter for movement
and sensation, regulates homeostatic functions
Medulla oblangata
sleep and arousal, pain transmission, mood regulation, involved in many homeostatic functions
Reticular formation
Function of recollective memory
Mammillary body
Secretaries melatonin
Pineal gland
monitors and coordinates
movement
Cerebellum
Internal white matter looks like a tree in cerebellum
Arbor vitae
of ventricles are small capillaries in each of the 4 ventricles that produce the CSF
Choroid plexus
receive information about smells from the nose and send it to the brain by way of the olfactory tracts.
Olfactory bulb
connects the olfactory bulb to the remainder of the cerebral cortex.
Olfactory tract
carry visual information from the optic chiasm to the left and right lateral geniculate bodies as a part of the visual pathway
Optic tract
channels that connect the paired lateral ventricles with the third ventricle at the midline of the brain.
Interverticular foremen
a fluid-filled canal that runs through the midbrain connecting the third and fourth ventricles.
Cerebral aqueduct
take signals from PNS to CNS
Afferent neurons – sensory
take signals from CNS to effectors
Efferent neurons – motor
carries information away from the cell body
Axon
carries information to the cell body
Dendrites
ribosomes and rough ER in the cell body
Nissl bodies
insulation around axon and makes conduction faster
Myelin sheath
cell membrane surrounding axon
Axolemma
cytoplasm within the axon
Axoplasm
where axon originates from cell body
Axon hillock
branches from central axon
Collaterals
fine branches at the end of axons
Telodendria
(synaptic knobs): innervates target cells
Axon terminals
spaces between myelin sheath allowing conduction
Node of raniver
one axon with two or more dendrites and usually a branched dendritic tree
• Motor (efferent), interneurons
• Location: most neurons in CNS and motor neurons in PNS
Multipolar neurons
one axon and one dendrite
• Sensory (afferent)
• Location: special sense organs in PNS (retina)
Bipolar neurons
single short process that splits into two axons with no dendrites
• Sensory (afferent)
• Location: sensory neurons in the PNS associated with pain, touch, vibrations
Psuedounipolar neurons
-70 to -55
Stimulus
Reaches threshold at
-55
-55 to +30
Depolarizing phass
+30 to -70
Repolarizing phase
presynaptic and postsynaptic membrane separated by synaptic cleft
• diffusion of neurotransmitters across the synaptic cleft causes an action potential in the postsynaptic membrane
Chemical synapse
joined by gap junctions allowing electrical currents to flow through cells
Electrical synapse