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cerebral cortex Flashcards

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10591552817Lesionis an area of damage or dysfunction0
10591558193Differences between a sign and symptom-A sign is evidence of a disease or an impairment that can be observed by someone other then the patient. (ex. edema and paralysis). -A symptom is subjective experience of the patient. (ex. pain, fatigue and numbness).1
10591581611Focal lesion- limited to a single location (ex. tumor in the spinal cord, carpal tunnel) Easiest to clinical assess2
10591588687Multifocal lesionlimited to several non symmetrical locations (ex. tumor that has metastasized to several locations)3
10591596783Diffuse lesionaffects bilaterally symmetric structures but does not cross the midline as a single lesion (ex. Alzheimers disease, MS, Seizure disorder)4
10591612783Neurological Examinationhas 2 parts- history and test/measures. History is a structured interview conducted in order to find symptoms. Test and measures are used to determine the probable cause of neurologic problems so, that appropriate care can be provided5
10591633144History Takingthe speed of onset and the pattern of progression provide important clues that cause of the nervous system dysfunction.6
10591641209Acuteindicating minutes to hours to maximal signs and symptoms Usually indicated a vascular problem signs and symptoms are getting worse/progressing therapist wouldn't attempt to tissue testing that would make the lesion worse7
10591652850Subacuteis progressing to maximal signs and symptoms over a few days. Usually indicated an inflammatory progress Signs/symptoms have plateau Don't over push the pt because then the therapist may become acute8
10591670026chronicis a gradual worsening of signs and symptoms continuing for weeks or years. Usually suggests a tumor or degenerative disease Signs/symptoms no longer are progressive Usually therapist can test the tissue w/o concern of exacerbating the lesion9
10591690760Consciousness levelone is aware of events and mental processes10
10591701437Alertpatient attends to ordinary stimuli11
10591702655Obtundedpatient tends to lose track of conversations and tasks. Patient falls asleep if little stimulation is provided Don't perform cognition testing patient is usually aware of the environment12
10591711387Stuporpatient is alert only during vigorous stimulation pt is not aware of the environment13
10591720504White Matter-is composed of axons surrounded by large quantities of myelin - bundles of myelinated axons (white matter) that travel together in the CNS system are- tract, lemniscus, fasciculus, column, peducle, capsule14
10591733760Subcortical areasprimarily consists of tracts oriented in three directions. The "white" comes from the fatty sheath covering the axons.15
10591761823commisural fiberstracts that connect the 2 sides (hemispheres) of the brain- best known as the corpus collosum16
10591767178association tracts- bundles of white matter (axons) that connect anterior and posterior cortical areas - Short association tracts connect together adjacent gyri (a ridge on the cerebral cortex) - Long association tracts connect lobes of the brain in one hemisphere17
11111413279short association tracts-composed of arcuate (curved) fibers -connects adjacent gyri w/in same lobe (ie connect primary motor cortex to motor association area)18
11111430896long association tracts-composed of longitudinal fascicule -connect gyri in different lobes of same hemisphere (ie tracts connecting Wernicke area & motor speech area)19
10591803690projection fiberscollection of axons connecting the cerebral cortex to the brain stem Nerve tracts pass through a communication link called the internal capsule - pass through a communication link called the internal capsule (Same side) - these axons carry information for the cerebral cortex to the subcortical structures20
11111482459corpus callosum- It is the main bridge between the left and right cerebral hemispheres. - Carries information from one lobe to another. - There are 300 million fibers in the average corpus callosum. - Sometimes in severe epilepsy surgery is performed to cut the corpus callosum to limit seizure activity.21
10591818424Example of periventricular white matter lesionlocated between the cortex and ventricles Periventricular Leukomalacia- CP diagnosis with premature infants22
10591837349Gray Matteris composed mainly of neuron cell bodies23
10591841759Groups of cell bodies in the PNSganglia24
10591845250groups of cell bodies in the CNSNuclei25
10591849288gray matter on the surface of the braincortex26
10591850936Afferent Axonsneurons that receive information from sensory organs and transmit the input to the CNS27
10591854164Efferent Axonsneurons that send impulses from the CNS to the limbs and organs of the body28
10591859995Brainstem3 parts: midbrain, pons, medulla oblongata Most of the cranial nerves are located in the brainstem29
10591866722Midbrainautomatic reflexes associated with visual and auditory systems30
10591876279Ponsmeans bridge of nerve fibers connecting the cerebellum and the medulla oblongata with other regions of the brain - regulates breathing and autonomic functions31
10591885957medulla oblongataThis part of the brain controls many model functions such as respiration, heart rate and digestion32
10591892535brainstem functionsbreathing, cardio, reflex postural (staying upright), motor control, equilibrium- head movements orienting to vertical adjustments, body temperature, swallowing and vomiting, autonomic functions, sleep center (circadian cycles)33
10591910584Cerebellum- sensory structure receives sensory signals (middle and inferior peduncle) from muscles, joints, tendons, semicircular canals, cerebral cortex - sends information back out via Superior and inferior peduncles - works ispsilateral- lesions are on the same side as symptoms34
10591930653Cerebellum functionsbalance, postural stability, regulation of muscle tone, vestibular ocular reflex, postural alignment, motor coordination, procedural learning35
105919810062 internal carotid arteriesprovide blood to most of the cerebrum36
107673753742 vertebral arteriesprovide blood to the occipital and inferior temporal lobes and to the brainstem and cerebellar region37
10591959648basal ganglia-large ganglions of nerve cells located deep in the cerebrum - initiation for normal motor function working memory (recalling needed information) - attention and motivation38
10591970422Thalamus- has several nuclei - it monitors input from the senses and acts as a relay station/sensory center of the cerebrum - Receives information from basal ganglia, the cerebellum, all sensory systems expect olfactory, processes the information and then relays the selected information to specific areas of the cerebral cortex39
10592041840relay nuclei of thalamus- convey information from the sensory systems (expect olfactory), the basal ganglia, or the cerebellum to the cerebral cortex.40
10592049583association nuclei of thalamus-receives input from the cerebral cortex and projects back to the cortex to regulate activity - processes emotional and some memory information or integrate different types of sensations41
10592057288nonspecific nuclei of the thalamusregulate consciousness, arousal, and attention42
10592061947Lateralpulsion- is a result from a lesion in posterior thalamus or medullary lesion affecting the vestibular nuclei occurs in approx. 10% of people post stroke also called pusher syndrome or contravesive pushing Usually resolves in in 3 to 6 months43
10592081460Primitive Brainlimbic system "emotional brain" limbic structures from a ring around the thalamus, deep within the cerebrum behavior, attitude, emotions, integrates recent memory, sex, aggression and rage44
10592100137hypthalamusendocrine system regulation: water balance, sleep, appetite, visceral functions (BP, Body temp), metabolic rate, aggression, emotions, growth It's regulates the autonomic nervous systems (ANS) it houses the master gland: pituitary gland45
10592117144Amygdalameans "almond", it is located in the deep cerebral hemisphere temporal region concerned with expression of emotional behavior the function is to compute the emotional significance of events (facial expression, social signals) and also, teaches us associations b/w cues and outcomes (what happens when we do something -rewards and punishments) gives the highly subjective feelings that coincide with an emotional state Fear processor- fight or flight response46
10592142990PSTD-with a severe event there are real or perceived effects on the prefrontal cortex. these changes are associated with fear and anxiety -Senses pick up on something in the environment -the amygdala decided that this is a threat and initiates a fear reaction -this information is transferred to the hypothalamus... who sets the adrenal glands into action causing adrenaline a stress hormone before the frontal lobe becomes aware of the situation47
10592171454temperal lobe-integration of information from multiple senses-sensory integration sound discrimination- auditory cortex receptive language- wernicke's area declarative memory located deep in the lobe (mediotemporal limbic area)48
11111612594Temporal lobe functions- word retrieval - language semantic memory processing - visual perception - multimodal sensory integration - autobiographical memory - visual recognition49
10592208137Temporal lobe-sensory integration1. The visual cortex (red)responds to the image of the bell, auditory cortex (blue) responds to the sound of the bell. 2. Recognizes a sensory stimulus- auditory / visual- Specific areas are for object recognition, face recognition 3. If damaged- Term "agnosia" means not knowing Visual Agnosia- (green section) (special example prosopagnosia) Auditory Agnosia- association cortex of temporal lobe50
10592257813Types of Agnosia-Astereognosia - visual Agnosia -auditory agnosia51
10766955006Astereognosiais the inability to identify objects by touch and manipulation despite intact discriminative somatosensation52
10766957806visual agnosiainability to recognize objects53
10766962652auditory agnosiainability to comprehend speech or nonspeech sounds54
10592279485Hippocampus- important with declarative memory (episodic memories, encoding name- face associations, personal memories in response to smells) - long term factual memory is most often attributed to the hippocampus. - if you lose your hippocampus, you lose the ability to remember facts beyond what can remain in short term memory - Alzheimer's and epilepsy affects the hippocampus - if you feel stressed by a situation...it raises the brain level of anxiety and the amygdala takes over - this will shift the thalamus routing the attention to the hippocampus and focus on self preservation in the moment55
10592360233Expressive (Broca's) Aphasia-halting speech, tendency to repeat - common phrases-words perseveration - disordered arrangement of words disordered grammar (missing articles of grammar (a, as, the) reading comprehension is intact56
10592375980Receptive (Wernicke's) Aphasia-fluent speech production however, meaningless -contrived or inappropriate words -language comprehension not intact (includes spoken and sign language) -alexia-inability to read - inability to write down their thoughts57
10766975451Alexiainability to read58
10592405349Parietal Lobe-primary sensory area- this is where nerve impulses carrying sensations of pain, temp, touch, tactile recognition (test this area with light touch discrimination, sharp/dull, 2 point, monofilament - proprioception with association cortex- sensation of our body in space (active and passive testing) -"where pathway"-spatial orientation/body image/visual59
10592859538lateral prefrontal cortex (Frontal lobe)-goal directed behavior, working memory, judgement, planning, abstract reasoning, dividing attention, sequencing activities - appropriate social behaviors, persistence of a difficult task60
10592882006medial prefrontal cortex (frontal lobe)- emotional regulation- apathy task initiation motivation self-awareness/metacognition impulsiveness/ safety awareness social cues for behavior emotional responses to social cues61
10592895471Ventral Prefrontal Cortex (frontal lobe)-regulating mood (subjective feelings) - regulating affect (observed demeanor) - internal reward system for guiding social behavior - decision making based on social consequences - self control - maintains attention to relevant information - "gut feelings"62
10592910737emotionis a short-term subjective experiences. Emotions also color our perceptions and influence our actions.63
10766988971Moodis sustained, subjective, ongoing emotional experiences.64
10592922000Coortico-basal ganglia-thalamic loop- which links the emotion, cognitive and motor systems - this loop in the brain in the responsible for a failed NYE diet plan65
10592944767primary somatosensory cortex- discriminates shape, texture, or size of objects - lesion cause: loss of tactile localization and conscious proprioception66
10592949050secondary somatosensory cortex- stereognosis and memory of the tactile and spatial environment - lesion cause: visual agnosis or optic ataxia67
10592952658primary motor cortex- voluntarily controlled movements - lesion cause: paresis, loss of fine motor control and spastic dysarthria68
10592958454supplementary motor area- initiation of movement, orientation planning, bimanual and sequential movements - lesion cause: apraxia69
10592979494Dysarthria- difficulty with the production/articulation of speech70
10592988833Spastic Dysarthria- Harsh, awkward speech caused by an upper motor neuron lesion.71
10592992614Flaccid Dysarthria- Breathy, soft, imprecise speech caused by damage to lower motor neurons in cranial nerves IX, X, and/or XII.72
10676725685frontal lobe executive functions- it decides what is worth attending to and what is worth doing - provides continuity and coherence to behavior across time so that impulses are within constraints of social norms.. keeps the limbic system in check hard wired (genetics) vs environmental- parents with similar skill deficits73
11098722966Assessments for cerebellum- test systems giving cerebellum input and test connection between systems and cerebellum74
11098752172Controls postural muscles- Center of mass over base of support, involves vestibular and eye input - equilibrium- vestibular system- cerebellum (Ex. I am leaning forward) - postural muscles- anticipatory contractions of glutes, soleus and back musclues75
11098873605Romberg's test- need 2 of 3 senses to maintain standing balance: proprioception, vestibular function, vision - monitor/adjust for change body position - observe postural sway with open closed and open - proprioception- healthy function dorsal columns of spinal cord - positive sign- sensory ataxia - if a pt is ataxic and is not positive is suggests that ataxia is cerebellar not proprioception76
11098955768Controls gross movements of the limbs- arm movements jerky and inaccurate if the cerebellum didn't constantly correct muscles with proprioceptive and visual inputs - test finger to nose, heel to shin (dysmetria testing)- spinocerebellar region77
11098981193DysmetriaLack of coordination of movement typified by the undershoot or overshoot of intended position with limb. Type of Ataxia. - it can also include an inability to judge distance or scale78
11099000846region controls fine motor rapid alternating movements- fine motor control to smoothly pick up items; developmental process as well ( watch a kid vs adult hold deal cards) - test strumming fingers and timing/ speed, also some goal directed motor plans- cerebrocrebellum79
11110509311spinal cord extends from- the foramen magnum - the opening at the inferoposterior aspect of the skull80
11110534317Parts of the brain stem-midbrain, pons, medulla oblongata81
11110538510medulla pyramids- cortiocospinal motor tracts, on the anterior surface side and are descending, carry motor signals to muscles most tracts cross over(decussate)82
11110587417Brainstem contains neurons that control:- equilibram - sensations of head movements - orientating to vertical adjustments - orientating to postural adjustments - cardiovascular activity - respiration - eye movements83
11110614797Most of the cranial nerves originate in the ________.- brainstem84
111106239043 attachments of the cerebellum to the brainstem- superior peduncle with midbrain- connects cerebellum to midbrain - middle peduncle with pons- connects cerebellum to pons - inferior peduncle with medullla- connects cerebellum to medulla85
11110678090anterior cerebral artery (ACA)is one of a pair of arteries on the brain that supplies oxygenated blood to most midline portions of the frontal lobes and superior medial parietal lobes. - The two anterior cerebral arteries arise from the internal carotid artery and are part of the circle of Willis.86
11110696101Circle of Willis- A circle of arteries at the base of the brain that supply blood to the brain87
11110706652middle cerebral artery- is one of the three major paired arteries that supply blood to the cerebrum. The MCA arises from the internal carotid and continues into the lateral sulcus where it then branches and projects to many parts of the lateral cerebral cortex.88
11110734838posterior cerebral artery (PCA)- supplies the occipital lobe, the inferior part of the temporal lobe, and various deep structures including the thalamus and the posterior limb of the internal capsule.89
11110807613somatosensory cortex- receives information from proprioceptive and tactile receptors via a three- neuron pathway90
11110824973auditory cortex- provides conscious awareness of the intensity of sounds91
11110882000visual cortex- receives written words as visual stimulation92
11110892093vestibular cortex- relative to gravity, perceives head movements and position93
11110958466Asteroegnosis- is the inability to identify objects by touch and manipulation despite intact discriminative somatosensation94
11110979014Primary Sensory cortex example- touching one spot on a patient's arm/ fingers (alternating both arms/hands) with your fingers - patient's eyes are closed, they have intact cognition, and are alert and not distracted "tell me when you feel me touch you" "Do it feel the same on both arms/ hands"95
11111035770Graphesthesia- with eyes closed, client can identify a number drawn on his palm with the blunt end of a pencil96
11111053758Graphesthesia testing- "tell me the number 1 draw on the palm of your hand" Soft touch sensation is intact - areas in the contralateral parietal lobe cortex97
11111096933Sensory sensory cortex example- place an familiar object in a patient's hand and see if they can identify the object with their eyes close- stereognosis98
11111130394Supplementary motor planning example- asking the patient to brush their hair - patient is able to grab the brush, identify the brush as a tool to brush their hair, but cannot perform brushing their hair in a coordinated sequential pattern - client needs "hand over hand" assist from the therapist to brush their hair99
11111197481primary motor cortex example- MMT (gross assessment) - "squeeze my two fingers" Client is unable to grasp or flex their fingers100
11111248007Flow of information from hearing to replaying1. Primary auditory cortex- auditory discrimination 2. Secondary auditory cortex- classification of sounds 3. Wernicke's area- auditory comprehension vocabulary 4. subcortical connections- Link Wernicke's and Borca's Areas 5. Broca's Area- instructions for language output 6. Oral and throat region of sensorimotor cortex- cortical output to speech muscles101
11111313971Prosopagnosia- inability to recognize faces - Case study example: Mr. X can't recognize his wife's face102
11111582985cortical mapping- refers to the graphic illustration of the localization of brain functioning103
11111708504Flow of cortical information from primary sensory cortex to motor cortex eating an apple104
11111727083frontal lobe functions- decision making - planning - problem solving - voluntary motor control - cognition - intelligence - language processing and comprehension105

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