Flashcards in Brain Intro Deck (39)
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1
Describe the following cellular elements:
cell body
axon terminal
axon
myelin
dendrites
cell body- synthesizes and packages macromolecules
axon terminal- synaptic transmission to other neurons
axon- conducts action potentials toward other neurons
myelin- glial covering that speeds conduction
dendrites- site of most (but not all) synaptic inputs
2
Describe saltatory conduction.
charge skips from node to node- accelerating the conduction of the impulse
3
What are the components of the neuron?
cell membrane, nucleus, nuclear membrane, nucleolus, organelles
4
What are the principal PNS glial cells?
Schwann cells
PNS axons can be myelinated or unmyelinated
5
What are the CNS glial cells?
oligodendrocytes - some CNS axons are myelinated by oligodendrocytes but others are unmyelinated
astrocytes- provide structural and metabolic support to neurons
ependymal cells- line the ventricles
microglia- respond to CNS injury
6
What is CNS?
brain and spinal cord
7
What are the main components of the brain?
cerebrum, cerebellum, basal ganglia, diencephalon, midbrain, pons, and medulla
8
Where does the long axis of the CNS bend?
cephalic flexure
dorsal ventral relationships change at the cephalic flexure between brainstem and diencephalon
9
Describe the following cerebral hemispheres:
frontal lobe
parietal lobe
temporal lobe
occipital lobe
limbic lobe
frontal lobe- motor areas
parietal lobe- somatosensory areas
temporal lobe- auditory areas
occipital lobe- visual areas
limbic lobe- interconnected with other limbic structures buried in the temporal lobe
10
Describe the three sulci.
What marks the boundary between sensory and motor cortex?
What is localized near the lateral fissure?
central sulcus (between frontal and parital)
lateral sulcus )between frontal and temporal/ temporal and parietal
parietooccipital sulcus- between parietal and occipital
central sulcus marks boundary between sensory and motor cortex.
speech and audition are localized near the lateral fissure.
11
Which areas are important for speech?
Which area is important for auditory functions?
Complex visual functions?
What is the primary receiving area for visual impulses?
Broca's motor speech area and Wernicke's area (reception of speech)
superior temporal gyrus (important for auditory functions)
inferior and middle temporal gyri (complex visual functions)
occipital lobe (primary area for receiving visual impulses)
12
Where is the insula?
hidden deep in the lateral or Sylvian Fissure by parts of the frontal, parietal, and temporal lobes
13
What does the diencephalon include?
thalamus and hypothalamus
thalamus-conveys information to the cerebral cortex (almost all motor and sensory pathways are relayed through the thalamus)
hypothalamus- controls autonomic nervous system
14
What does the cerebral hemisphere include?
brainstem?
cerebellum?
cerebral hemisphere- cerebral cortex and corpus callosum
brainstem- midbrain, pons, medulla
cerebellum- vermis and hemisphere
15
What makes CSF?
Where is vision processed most intensely?
CSF- made in choroid
vision is processed most intensely near the calcarine fissure
16
What are major components of the basal ganglia?
Which are major limbic structures?
basal ganglia- caudate nucleus, putamen, ang globus pallidus
(lentiform nucleus = putamen and globus pallidus)
limbic structures- amygdala and hippocampus
17
Precentral gyrus
Brain region-
General functions-
Associated disorders-
Brain region-frontal lobe of cerebral cortex
General functions- voluntary movement of muscles of head and head region
Associated disorders- loss of voluntary movement of body and head region
18
Premotor region
Brain region-
General functions-
Associated disorders-
Brain region- frontal lobe of cerebral cortex
General functions- aids and integrates voluntary movements of body
Associated disorders- apraxia (loss of ability to carry out complex movements of body and head)
19
Frontal eye fields
Brain region-
General functions-
Associated disorders-
Brain region-frontal lobe of cerebral cortex
General functions- controls voluntary horizontal movement of the eyes
Associated disorders- loss of voluntary horizontal eye movement (eyes cannot deviate to side opposite lesion)
20
Prefrontal cortex
Brain region-
General functions-
Associated disorders-
Brain region-frontal lobe of cerebral cortex
General functions- intellectual functions, affective processes
Associated disorders-intellectual and emotional impairment
21
Broca's motor speech area
Brain region-
General functions-
Associated disorders-
Brain region- frontal lobe of cerebral cortex
General functions- regulates motor aspects of speech
Associated disorders- motor aphasia
22
Postcentral gyrus
Brain region-
General functions-
Associated disorders-
Brain region- parietal lobe of cerebral cortex
General functions- conscious perception of somesthetic sensation
Associated disorders- loss of somatosensory perception
23
Wernicke's area
Brain region-
General functions-
Associated disorders-
Brain region- parietal lobe of cerebral cortex
General functions- receptive integration of speech
Associated disorders- receptive aphasia
24
Superior parietal lobule
Brain region-
General functions-
Associated disorders-
Brain region- parietal lobe of cerebral cortex
General functions-integration of sensory and motor functions; programming mechanism for motor responses
Associated disorders- posterior parietal syndrome; sensory neglect; apraxia
25
Superior temporal gyrus
Brain region-
General functions-
Associated disorders-
Brain region- temporal lobe of cerebral cortex
General functions- auditory perception
Associated disorders- loss of auditory perception
26
Middle temporal gyrus
Brain region-
General functions-
Associated disorders-
Brain region- temporal lobe of cerebral cortex
General functions- detection of moving objects
Associated disorders- loss of movement detection
27
Inferior temporal gyrus
Brain region-
General functions-
Associated disorders-
Brain region- temporal lobe of cerebral cortex
General functions- recognition of faces
Associated disorders-loss of facial recognition
28
Upper and lower banks of calcarine sulcus
Brain region-
General functions-
Associated disorders-
Brain region- occipital lobe of cerebral cortex
General functions- visual perception
Associated disorders- partial or total loss of vision of the contralateral visual fields for both eyes, depending upon the extend of the lesion in the visual cortex
29
Lateral, third, and fourth ventricles and cerebral aqueduct.
Brain region-
General functions-
Associated disorders-
Brain region- ventricles of brain (deep brain structures)
General functions- flow of CSF throughout CNS: source of electrolytes and conduit of neuroactive and metabolic products
Associated disorders- hydrocephalus
30
