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Central Nervous system
Terms dealing with the central nervous system.
55
Anatomy
Undergraduate 2
05/04/2007

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Term
CNS
Definition
Central Nervous System - composed of the brain and spinal cord
Term
Cephalaization
Definition
The process that develops the head
Term
Gyri
Definition
Ridges in the cerebral hemisphere
Term
Cerebral Hemispheres
Definition
Form the superior part of the brain and make up 83% of its mass.
Term
Sulci
Definition
Shallow grooves of the cerebral hemisphere.
Term
Fissures
Definition
Deep grooves of the cerebral hemisphere.
Term
Fissures
Definition
Deep fissures of the cerebral hemisphere.
Term
Longitudinal Fissure
Definition
Separate the cerebral hemispheres. Runs from between your eyes to the back of your head.
Term
Deep sulci divide the hemispheres into five lobes:
Definition
Frontal, parietal, temporal, occipital, and insula.
Term
Central Sulcus
Definition
Separated the frontal and parietal lobes.
Term
Parieto-occipital sulcus
Definition
Separates the parietal and occipital lobes.
Term
Lateral Sulcus
Definition
Separates the parietal and temporal lobes.
Term
The precentral and postcentral gyri
Definition
Border the central sulcus
Term
Cerebral Cortex
Definition
Superficial (surface) gray matter; accounts for 40% of the mass of the brain. Enables sensation, communication, memory, understanding, and voluntary movements. Each hemisphere controls the opposite side of the body.
Term
Three types of functional areas of the cerebral cortex:
Definition
Motor areas, sensory areas, and association areas.
Term
Motor area of cerebral cortex
Definition
Controls voluntary movement
Term
Sensory Areas of the cerebral cortex
Definition
Conscious awareness of sensation
Term
Association areas of the cerebral cortex
Definition
Integrate diverse information
Term
Commissures
Definition
Connect corresponding gray areas of the two hemispheres.
Term
Association fibers
Definition
Connect different parts of the same hemisphere
Term
Projection fibers
Definition
Enter the hemispheres from lower brain or cord centers
Term
Cerebral white matter
Definition
is resposible for communication between the cerebral cortex and lower CNS center, and areas of the cerebrum.
Term
Basal Nuclei
Definition
Masses of gray matter found deep within the cortical white matter.
Term
Diencephalon and its three paired structures:
Definition
Central core of the forebrain. THree structures are: thalamus, hypothalamus, and epithalamus.
Term
The thalamus, hypothalamus, and epithalamus enclose what?
Definition
The third ventricle.
Term
Thalamus
Definition
egg shaped masses that form the top side walls of the third ventricle. Funtions to recieve input and send it to the cerebral cortex. Mediates sensation, motor activities, cortical arousal, learning, and memory.
Term
Hypothalamus
Definition
Located below the thalamus, it caps the brainstem and forms the inferolateral walls of the 3rd ventricle. Connects to the pituitary gland.
Term
Epithalamus
Definition
Most dorsal portion of the diencephalon; forms roof of the 3rd ventricle.
Term
Brain Stem
Definition
Consists of 3 regions: midbrain, pons, and medulla oblongata. Controls autonomic behaviors necessary for survival.
Term
Midrain
Definition
Located between the diencephalon and the pons
Term
Pons
Definition
Bulging brainstem region between the midbrain and the medulla oblongata.
Term
Medulla oblongata
Definition
Most inferior part of the brain stem. ALong with the pons, forms the ventral wall of the 4th ventricle.
Term
Pyramids
Definition
2 longitudinal ridges formed by the corticospinal tracts
Term
Cerebellum
Definition
Located dorsal to the pons and medulla. Makes up 11% of the brains mass. Made up of two bilaterally symmetrical hemispheres connected medially by the vermis. Each hemisphere has 3 lobes: anterior, posterior, and flocculonodular.[image]
Term
Cerebellar processing
Definition
Receives impulses of the intent to initiate voluntary muscle contraction. Plays a role in language and problem solving.
Term
What protects the brain?
Definition
Bone, meninges, and cerebrospinal fluid. Harmful substances are shielded from the brain by the blood brain barrier.
Term
Meninges
Definition
3 connective tissue membranes that lie external to the CNS: dura mater, arachnoid mater, and pia mater.
Term
Dura Mater
Definition
Leathery strong meninx composed of two fibrous connective tissue layers.
Term
Arachnoid mater
Definition
The middle meninx, which forms a loose brain covering. Seperated from the dura mater by the subdural space.
Term
Cerebrovascular Accidents
Definition
Strokes. Caused when blood circulation to the brain is blocked and brain tissue dies. Most commonly caused by blockage of a cerebral artery.
Term
Degenerative Brain Disoders:
Definition
Alzheimer's disease, Parkinson's disease, and Huntington's disease.
Term
Spinal Cord Trauma: Paralysis
Definition
Loss of motor function
Term
Spinal Cord Trauma: Flaccid Paralysis
Definition
Severe damage to the ventral root or anterior horn cells. There is no voluntary or involuntary control of muscles.
Term
Spinal cord trauma: Paraplegia
Definition
Transection between T1 and L1
Term
Spinal Cord Trauma: Quadriplegia
Definition
Transection in the cervical region
Term
Memory
Definition
The storage and retrieval of information
Term
Three principles of memory:
Definition
Storage, processing, memory traces.
Term
Storage
Definition
Occurs in stages and is continually changing
Term
Processing
Definition
Accomplished by the hippocampus and surrounding structures
Term
Memory traces
Definition
Chemical or structural changes that encode memory
Term
Short Term Memory
Definition
(working memory) A fleeting memory of events that continually happen. Lasts seconds to hours and is limited to 7 or 8 pieces of information.
Term
Long term memory
Definition
Has limitless capacity
Term
Factors that affect transfer of memory from STM to LTM
Definition
Emotional state, Rehearsal, Association of old data with new data, and Automatic Memory.
Term
Skill Memory
Definition
Acquired through practice. Involves motor activity. Do not retain the context in which they were learned.
Term
Fact Memory
Definition
Declarative memory. Entails learning explicit information. Stored with context in which it is learned.
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