CENTRAL NERVOUS SYSTEM Flashcards
Bilaterally symmetric soft gelatinous structure surrounded by meninges
Brain
The brain is enclosed in a what?
Cranium
An average human brain weighs
3 pounds or 1300-1400 grams
What are the 4 major regions of the brain?
Cerebral hemisphere, diancephalon, brain stem, and cerebellum
Comprise half of brain mass and hides the remainder of brain from view
Cerebral hemisphere
The cerebral hemisphere resembles a
Walnut
deep fissure incompletely separates the hemispheres from one another
Longitudinal cerebral fissure
the entire surface of the hemisphere exhibits elevated ridges called
Gyri
Depressions of the cerebral hemisphere are called?
Sulci
True or false. Each hemisphere divided into several lobes are named after the bones above them
True
3 main regions of the cerebral hemisphere
Cortex, White matter, and basal nuclei
situated deep within the white matter and is composed of gray matter
Cortex
speech, memory, logical and emotional responses, consciousness, sensation, voluntary movement, are functions of?
Cortex
it forms the bulk of the cerebrum
White matter
they carry info destined for the cortex and cortical responses to other regions of the CNS
Fiber tracts
Large fiber tract that connects the 2 hemispheres
Corpus callosum
help regulate motor activities
Basal nuclei
True or false. When you have a problem with the basal nuclei, you can still walk normally
False
4 main lobes of the cerebral hemisphere
Frontal, parietal, temporal,and occipital
separates the frontal lobe to the parietal lobe
Central sulcus
The division of the parietal lobe and occipital lobe is called the?
Parieto-occipital sulcus
Impulses traveling from the sensory receptor, except the special senses, are localized or restricted and interpreted in this area
Primary somatic sensory area
Allows you to recognize pain, difference in temperature, or even a light touch
primary somatic sensory area
True or false. The primary somatic sensory area works separately
False. they work contralateral meaning the left receives from the right side of the body, and vice versa
Allows us to consciously move our skeletal muscles and is structurally labeled as the pre-structural gyrus
Primary motor area
The major voluntary motor tract in the primary motor area that descends to the spinal cord
Pyramidal tract or corticospinal tract
Motor speech area found at the base of the frontal lobe
Broca’s area
The broca’s area is in which side of the hemisphere?
Left
Important for language development located in temporal lobe. Responsible for comprehension of speech, meaning the ability to understand what is spoken
Wernick’s area
Damage in the wernick’s area can head to which disorder where there there is difficulty in speaking coherent sentences or understanding others’ speech
Aphasia
Responsible for higher intellectual reasoning and socially acceptable behavior
Anterior Association Area of the Frontal Lobe
Plays a role in recognizing patterns and faces and blending of several different inputs into an understanding of the whole situation
Posterior Association Area
fibers that connect areas within a hemisphere
Association fibers
Sits on tops of the brain stem and enclosed by the cerebral hemispheres
Diencephalon