Central Nervous System Flashcards
What protects the brain?
Cranial meninges
What is included in the brainstem?
Medulla, pons, midbrain
_ allows shock absorption and circulation of nutrients.
Cerebrospinal fluid
_ allows coordination of muscular movements and balance.
Cerebellum
_ allows muscular movements, emotions, and intelligence.
Cerebrum
_ controls temperature and pain recognition, homeostasis, thirst center, and sleep patterns.
Diencephalon
_ allow consciousness, heartbeat, breathing, visual and auditory responses.
Brainstem
How much does the brain weigh?
3 lbs
Largest and most complex mass of nervous tissue in the body.
Brain
Organizing and processing center of the nervous system.
Brain
What are the four main part of the brain?
Cerebrum/cerebral hemisphere, diencephalon, brainstem, cerebellum
Part of the brain responsible for intellectual process and emotions.
Cerebrum
Part of the brain responsible for homeostasis.
Diencephalon
Part of the brain responsible for breathing, heartrate, reaction to visual and auditory stimulation.
Brainstem
Part of the brain responsible for body posture and balance.
Cerebellum
Most superior of the brain.
Cerebrum
Makes up the bulk of the brain which is described to be larger than the 3 brain regions combined.
Cerebrum
Have nerve centers for sensory & motor activities.
Cerebrum
What composes the surface area of the cerebrum?
Gray matter referred to as cerebral cortex
Controls speech, memory, logical & emotional responses as well as consciousness, interpretation of sensation & voluntary movement.
Cerebral cortex
3 basic regions of cerebrum
Cortex, internal white matter, and basal nuclei
Largest portion of the brain.
Cerebrum
2 divisions of the cerebrum
Right hemisphere and left hemisphere
The right and left hemisphere is separated by a?
Longitudinal fissure
4 lobes of the cerebrum
Frontal, parietal, occipital, and temporal
Part of the cerebrum that controls the right side of the body.
Left hemisphere
Hemisphere responsible for math, analytic, and speech.
Left
Hemisphere that controls the left side of the body.
Right
Hemisphere responsible for music, art, and abstract ideas
Right
Connection between 2 hemispheres.
Corpus callosum
Elevated ridges/convolutions on the surface of each hemisphere.
Gyrus/gyri
Grooves that separate each gyri.
Sulcus/sulci
Deep grooves
Fissure
Deep bridge of nerve fibers that connects the 2 cerebral hemisphere.
Corpus callosum
Alternate name for the central sulcus.
Sulcus of Rolando
Forms the boundary between the frontal and the parietal lobes on the lateral and medial surfaces of the cerebral hemispheres.
Central sulcus
A deep fissure that is first identified on the inferior surface of the brain close to the anterior perforated substance but becomes most visible on the lateral surface.
Lateral sulcus
Separates the frontal and parietal lobes from the temporal lobe.
Lateral sulcus
Primary motor area
Frontal lobe
Forms anterior portion of each hemisphere.
Frontal lobe
Controls voluntary muscular functions (allows us to consciously move our skeletal muscles).
Frontal lobe
Controls mood, aggression, reasoning, thought & motivation
Frontal lobe
Major voluntary motor tract
Corticospinal/pyramidal tract
Most of the neurons in the primary motor area control body areas having fast motor control, including?
Face, mouth, and hands
Aside from neurons that control body areas having fast motor control, what other cells are present in the frontal lobe?
Large pyramidal-shaped cells
Impulses cross over from one side of the brain to the other at the _ to stimulate the opposite side of the body.
Corticospinal tract
Primary somatic sensory area
Parietal lobe
Located behind the frontal lobe, separated by central sulcus.
Parietal lobe
Control center for evaluating sensory information of touch, pain, balance, taste and temperature (coldness).
Parietal lobe
Impulse travelling from body’s sensory receptors (except for special senses) are localized & interpreted in this area.
Parietal lobe
Body regions with most sensory receptors.
Lips and fingertips
Lobe that is considered as the auditory area.
Temporal lobe
Located beneath the frontal & parietal lobes separated by lateral fissure.
Temporal lobe
Evaluates hearing input & smell as well as being involved with memory processes.
Temporal lobe
In what aspects is the temporal lobe involved?
Hearing, smell, and memory processes
Parietal lobe is the control center for evaluating sensory information of? (5)
Touch, pain, balance, taste and temperature (coldness)
The frontal lobe also controls? (5)
Mood, aggression, reasoning, thought, and motivation
Important center for abstract thoughts and judgement.
Temporal lobe
_ is found deep inside the temporal lobe.
Olfactory area
Lobe considered as the visual area.
Occipital lobe
Forms back portion of each hemisphere.
Occipital lobe
What is the 5th lobe, deeply embedded in the lateral sulcus?
Insula
Where is the insula embedded?
Lateral sulcus
Covered by portions of the frontal, parietal & temporal lobes.
Insula
Located in the left cerebral hemisphere (frontal lobe).
Broca’s area
Motor speech area
Broca’s area
Specialized cortical area involved in our ability to speak.
Broca’s area
Where is the broca’s area located?
Left cerebral hemisphere (frontal lobe)
Found at the base of pre-central gyrus.
Broca’s area
Damage to the broca’s area causes?
Expressive aphasia (inability to communicate)
Critical language area
Wernicke’s area
Where is the wernicke’s area located?
Left cerebral hemisphere (temporal lobe)
Involved with language comprehension.
Wernicke’s area
Damage to the wernicke’s area causes?
Receptive, sensory, and fluent aphasia
Patient is still able to speak but lacks meaning; damaged patient is unable to vocalize words.
Wernicke’s area; broca’s area
Composed of fiber tracts carrying impulses to, from or within the cortex.
Cerebral white matter
A very large fiber tract that connects the cerebral hemisphere (commisures), allows cerebral hemispheres to communicate with one another.
Corpus callosum
Islands of gray matter buried deep within white matter of cerebral hemisphere.
Basal nuclei
Helps regulate voluntary motor activities.
Basal nuclei
Problems related to basal nuclei.
Huntington’s disease/ huntington’s chorea & parkinson’s disease
Inability to walk normally or carry other voluntary movements.
Huntington’s disease
A language disorder that makes it hard for you to read, write, and say what you mean to say.
Aphasia
Located between the brainstem and cerebrum.
Diencephalon
Where is the diencephalon located?
Between the brainstem and cerebrum
Surrounds the 3rd ventricle & is organized into masses of gray matter called nuclei.
Diencephalon
What does the diencephalon surrounds?
Third ventricle
3 main structures of diencephalon
Thalamus, hypothalamus, and epithalamus
The diencephalon also contains? (5)
Optic tract, optic chiasm, infundibulum, mamillary bodies, and pineal gland/body
Attaches the hypothalamus to the pituitary gland.
Infundibulum
Involved in memory and emotional responses to odor.
Mamillary bodies
Part of the epithalamus, pine-cone shaped endocrine gland that secretes melatonin affecting our moods and behavior.
Pineal gland
What does the pineal gland secrete?
Melatonin
Largest and superior portion of diencephalon.
Thalamus
Encloses shallow third ventricle of the brain.
Thalamus
Relay station for sensory impulses.
Thalamus
Interpretation center for conscious recognition of what is pleasant & unpleasant.
Thalamus
Neuron of sensory cortex that localizes and interpret sensation.
Pain, pressure, and touch
Touch receptor
Meissner
Pressure receptor
Pacinian
The inferior part (under the thalamus) of the diencephalon.
Hypothalamus
Sends impulses to and receive them from the cerebrum & thalamus.
Hypothalamus
Intermediary between NS & ES as it send out signals that control the pituitary gland.
Hypothalamus
_ of hypothalamus produce _.
Nerve cells, hormones
Plays a role in the regulation of body temperature, water balance,& metabolism
Hypothalamus
Controls and integrates ANS.
Hypothalamus
Center of mind-over matter phenomena.
Hypothalamus
Center for many drives & emotions as it is an important part of the LIMBIC system or Emotional-Visceral Brain.
Hypothalamus
The hypothalamus is an important part of the?
Limbic system/emotional-visceral brain
Hangs from the anterior floor of the hypothalamus.
Pituitary gland
Bulge from the floor of hypothalamus posterior to pituitary gland.
Mamillary bodies
Controls homeostasis, body temperature, water balance, hunger, fear, rage, sexual emotions, regulates our food intake (metabolism).
Hypothalamus
Forms the roof of the 3rd ventricle.
Epithalamus
2 important parts of the epithalamus
Pineal body and choroid plexus
Knots of capillaries within each ventricle, forms the CSF.
Choroid plexus
How long is the brainstem?
3 inches (7.5cm) long
Connects the brain to the spinal cord.
Brainstem
Very delicate area of the brain, damage to even small areas could result in death.
Brainstem
Associated with cranial nerves and control vital activities such as breathing & BP.
Brainstem
Provides a pathway for ascending and descending tracts.
Brainstem
The brainstem has many?
Small gray matter areas
What does the nuclei in the brainstem produce?
Rigidly programmed autonomic behaviors necessary for survival
Smallest part of the brainstem.
Midbrain
Other name for midbrain.
Mesencephalon
Extends from the mamillary body to the pons inferiorly.
Midbrain
Contains dorsal tectum.
Midbrain
A reflex center that controls movement of eyeballs & head in response to visual stimuli.
Dorsal tectum
Also controls movement of the head & trunk in response to auditory stimulus.
Midbrain
3 structures of the midbrain
Cerebral aqueduct, penducles, and corpora quadrigemina
Tiny canal that travels through the midbrain and connects the 3rd ventricle of diencephalon to the 4th ventricle.
Cerebral aqueduct
Bulging fiber tracts which convey ascending & descending impulses from the cerebral cortex to pons & the spinal cord.
Cerebral penducles
Four rounded protrusions, reflex centers involved with vision & hearing.
Corpora quadrigemina
Means bridge
Pons
Rounded structure that protrudes just below the midbrain.
Pons
Mostly fiber tracts that relay impulses from the medulla oblongata to cerebrum & back to medulla
Pons
What areas does pons have? (2)
Pneumotaxic and apneustic
What does the pneumotaxic and apneustic area help control?
Breathing
Most inferior part of the brain stem continuous to the spinal cord.
Medulla oblongata
Contains all ascending & descending tracts that connect the spinal cord & parts of the brain.
Medulla oblongata
Crossing of tracts
Decussation of pyramids
Contains many nuclei that regulate vital visceral activities.
Medulla oblongata
Explains why motor areas of one side of the cortex of the cerebrum control skeletal muscle movements in opposite side of the body.
Decussation of pyramids
Lies posterior to the pons and medulla & anterior to the cerebellum.
4th ventricle