Biological Basis of Behavior-Central Nervous System Flashcards
What is the role of sensory neurons?
To bring information in the central nervous system
What is another name for Efferent neurons?
Motor Neurons
What is the role of motor (efferent) neurons?
To carry information away from the central nervous system to various muscles and glands
Names of the Cervical Vertebrae
C1-C7
Names of the Thoracic Vertebrae
T1-T12
Names of the Back Vertebrae
L1-L5
Names of the Sacral Vertebrae
S1
What are the four spinal vertebrae in order from top to bottom?
Cervical
Thoracic
Back
Sacral
What is Quadriplegia?
Paralysis of all limbs
Severing the spinal cord between C1-C5 results in?
Quadriplegia
What is paraplegia?
Inability to move one’s legs
Severing the spinal cord between C6 or C7 results in?
Paraplegia and partial paralysis of the arms
Severing the spinal cord at T1 or below results in?
Paraplegia
What is paresis?
Weakness in one or more limbs
Incomplete severation of the spinal cord in any location results in?
Paresis
What are the 3 main parts of the brain?
Cerebrum
Cerebellum
Brain Stem
Which part of the brain is least developed at birth?
Cortex
What are the Gyri?
The fold of the brain. They add cortical surface area to the brain.
What is the outer surface area of the brain called?
Cortex
The cerebrum consists of what 2 areas?
Cortical and Subcortical areas
What are the 4 lobes of the brain?
Frontal Lobe
Parietal Lobe
Temporal Lobe
Occipital Lobe
Which lobe is the largest?
Frontal Lobe
The Frontal Lobe contains what 3 divisions?
Prefrontal Cortex
Pre-Motor Area
Motor Area
What are the functions of the Prefrontal Cortex?
Personality Emotionality Cognitive Flexibility Task Initiation Abstract Thinking Judgment Planning
What is the function of the Pre-Motor Area?
Planning Movement
What is the function of the Motor Area?
Initiating Movement
Where in the brain would you find Broca’s Area?
Left frontal lobe
What is Broca’s Area
Controls the muscles involved in speech production
What is Broca’s Aphasia?
The inability to express language
What are the functions of the parietal lobe?
Processing Somatosensory Information (ie. pain, heat, proprioception)
What is proprioception?
Identifying one’s location in space (ie. the ability to understand where your body is, even with your eyes closed)
What are the functions of the right parietal lobe?
Directing attention and visual-spatial skills
Overlearned motor and linguistic routines (ie. reading, writing, naming objects)
Anomia
Difficulty naming objects
Agnosia
Difficulty recognizing things
Agraphia
Difficulty writing
Alexia
Difficulty reading
Acalculia
Difficulty with math
A stroke in the right parietal lobe can result in?
anomia, agnosia, agraphia, alexia, acalculia, difficulty distinguishing left from right, difficulty with hand-eye coordination, and difficulty recognizing body parts
Symptoms of Gerstmann’s Syndrome
Agraphia, acalculia, left/right disorientation, finger agnosia
Gerstmann’s Syndrome is a result of a stroke in what part of the brain?
Left Parietal Lobe
A stroke in the left parietal lobe can result in?
Gerstmann’s Syndrome
What structures are found in the temporal lobe?
Primary auditory cortex and connections to the limbic system
What are the functions of the left temporal lobe?
Verbal Memory
Language Comprehension
Where is Wernicke’s area located?
Left Temporal Lobe
Damage to Wernicke’s area results in?
Difficulty understanding speech
What is the function of Wernicke’s area?
Processing and understanding speech
What is the function of the right temporal lobe?
Visual Memory
Damage to the right temporal lobe results in?
Increased Aggressive Behavior
Change in Sexual Behavior
Memory Difficulties
Problems Understanding Speech
What structure is located in the occipital lobe?
Primary Visual Cortex
Which lobe of the brain is least likely to be damaged?
Occipital Lobe
Damage to the Occipital lobe results in?
Difficulty recognizing drawn objects
Difficulty identifying colors
Hallucinations or delusions
Difficulty recognizing words
What are Sulci?
Grooves that separate the lobes
The Central Sulcus separates which lobes?
Frontal and Parietal Lobes
The Lateral Sulcus separates which lobes?
Temporal Lobes from the Frontal/Parietal Lobes
Which hemisphere is dominant in most people?
Left
What are the primary functions of the left hemisphere?
Language and Motor Control
Verbal Memory
Rational/Analytical/Logical/Abstract Thinking
Language is controlled by which part of the brain?
Left Hemisphere
Which part of the brain controls rational, analytical, logical, and abstract thinking?
Left Hemisphere
Damage to the left hemisphere results in?
Language disorders, aphasia, agraphia, anomia, motor disturbances, and apraxias
What are the two main functions of the left hemisphere?
Language and Logic
What are the primary functions of the right hemisphere?
Art, perception, visual-spatial abilities, intuition, concept of body image, ability to comprehend and express visual-facial-verbal emotion
Damage to the right hemisphere can result in?
Left side hemi-neglect, prosopagnosia, agnosias for musical sound, affective abnormalities including abnormal sexual behavior
Prosopagnosia
Inability to recognize the faces of familiar people
What is the function of the corpus collosum?
To allow the left and right hemispheres to communicate with one another
Which brain structure is key to emotions?
Limbic System
What are the 5 primary structures of the limbic system?
Thalamus Hypothalamus Hippocampus Amygdala Septum
Which brain structure is linked to the autonomic and endocrine systems?
Limbic System
What is the function of the thalamus?
Sensory relay station for the brain
The thalamus links the brain for every sense except?
Smell
Schizophrenia is linked to abnormalities of what brain structure?
Thalamus
What is the key function of the hypothalamus?
Homeostasis (Fever, Feeding, Fighting, Falling Asleep, Sex)
The superchiasmic nucleus is located in what brain structure?
Hypothalamus
What is the function of the superchiasmic nucleus?
Regulating the body’s sleep-wake cycle
What is the primary function of the hippocampus?
Consolidating memory from short-term to long-term memory
What is the primary function of the amygdala?
Attaches emotional significance to sensory input. It plays an important role in the experience of fear, aggression, and emotional memory
What brain structure is primarily responsible for the startle response?
Amygdala
Which brain structure is linked to PTSD?
Amygdala
Destruction of the amygdala results in what syndrome?
Cluver-Bucy Syndrome
What is Cluver-Bucy Syndrome
Seen in monkeys that had their amygdala removed. Results in placidity, apathy, asexuality, and excessive eating
What is the role of the septum?
Decreasing aggression
Damage to the septum can result in what syndrome?
Rage Syndrome
What is the role of the Basal Ganglia?
Coordinating movement and posture
What are the 5 key structures of the basal ganglia?
Caudate Nucleus Putamen Substantia Nigra Globus Palladus Sub-thalamic Nucleus
Dysfunction of the basal ganglia results in what?
Too much or not enough movement (Huntington’s, Parkinson’s, Tourette’s, OCD)
OCD is linked to dysfunction of what brain structure?
Basal Ganglia
Huntington’s is linked to dysfunction of what brain structures?
Caudate nucleus and putamen
Symptoms of Huntington’s
Choreiform movements-jerking or writhing movements
Symptoms of Parkinson’s
Tremor, Rigidity, Bradykinesia (slowness of movement)
Parkinson’s is linked to dysfunction of what brain structure?
Substantia Nigra
What is the key function of the cerebellum?
Providing Excitatory input that is responsible for maintaining movement or motor activity; controls the ability to adjust your posture and muscle tone
Damage to the cerebellum results in?
Ataxia, problems with posture, problems with gait, incorrect timing with muscles, vertigo, inability to reach out and grab objects, difficulty with rapid movements
Ataxia
Lack of coordination of voluntary movement without weakness or sensory loss
There are how many cranial nerves?
12
How many cranial nerves begin in the brain stem?
10
What are the 3 key structures of the brain stem?
Pons
Medulla
Reticular Formation
Cranial Nerve #12 is also known as?
Hypoglossal Nerve
Damage to the hypoglossal nerve results in?
Problems of articulation
What are the primary functions of the reticular formation?
Awareness, attention, and sleep
The Reticular Activating System is located in which brain structure?
Reticular Formation
What is the function of the RAS?
Mediates alertness; Projects into the hypothalamus to regulate the sleep/wake cycle
What are the key functions of the brain stem?
Sleep
Respiration
Movement
Cardiovascular Activity
Damage to the brain stem often results in?
Death
What is a conduction aphasia?
Lesions between the pathways connecting the expressive and receptive speech areas
How is a conduction aphasia different from Wernicke’s aphasia?
People with conduction aphasias can follow commends
What is a global aphasia?
Widespread damage to the language areas the result in problems with fluecy, comprehension, repetition, and naming
What is anomic aphasia?
Difficulty recalling words or names
What are the 3 types of transcortical aphasias?
Transcortical Motor Aphasia
Transcortical Sensory Aphasia
Transcortical Mixed Aphasia
Which transcortical aphasia is most similar to Broca’s aphasia?
Transcortical Motor Aphasia
Which transcortical aphasia is most similar to Wernicke’s aphasia?
Transcortical Sensory Aphasia
Which transcortical aphasia is most similar to Global aphasias?
Transcortical Mixed Aphasia
How are transcortical aphasias different than Broca’s and Wernicke’s aphasias?
Individuals with transcortical aphasias can repeat phrases said to them, but cannot say these phases spontaneously
What is an apraxia?
The inability to carry out voluntary purposeful motor movements even though there are no motor or sensory deficits.
What are agnosias?
Loss of the ability to recognize a specific sensory stimuli even though there is nothing wrong with the sense itself
Anosagnosia
Lack of awareness that you have a problem
Prosopagnosia
The inability to recognize familiar faces
Retrograde Amnesia
Loss of pre-existing memories
Which memories are most affected by retrograde amnesia?
Recent Autobiographical memories
Which memories are least affected by retrograde amnesia?
Remote semantic (factual) memories
Anterograde Amnesia
Lost of the ability to create or form new memories
Which brain structure is implicated in anterograde amnesia?
Hippocampus