Chap 8: Nervous System - CNS I: Brain Regions & Organizations Flashcards
THE FOUR ADULT BRAIN REGIONS:
- Cerebral Hemispheres
- Diencephalon
- Brainstem
- Cerebellum
outer layer or “bank” of gray matter
cortex
- Cushions the brain and spinal cord from injury
CEREBROSPINAL FLUID
CSF appearance
clear, colorless
CSF Pressure:
70-180mm water
CSF Volume
contains approximately 125 to 150 ml
CSF FLOW
- Choroid plexus
- Lateral ventricle
- Foramen of monroe
- Third ventricle
- Sylvian aqueduct
- Fourth ventricle
- Foramen of Luschka
- Foramen of Magendie
- Subarachnoid space
- Arachnoid villi
- Superior sagittal sinus
- Are continuous with one another and with the central canal of the spinal cord
VENTRICLES
- Hollow ventricular chambers are filled with
CSF and lined by ependymal cells
- Deep within each cerebral hemisphere
LATERAL VENTRICLE
- Large C-shaped chamber
LATERAL VENTRICLE
thin membrane separating the lateral ventricles
o Septum pellucidum
- narrow ventricle
3RD VENTRICLE
ventricle: dorsal to pons and superior to medulla
4TH VENTRICLE
Blood supply of ACA
Medial aspect of the frontal and parietal lobes
Blood supply of MCA
Most of the lateral surfaces of frontal, temporal, and parietal lobes
Blood supply of PCA
Inferior Occipital and temporal lobes
drains the upper part of the cerebral cortex, subarachnoid space via the arachnoid granulation
Superior sagittal sinus
drains the deeper parts of the cerebrum
Inferior sagittal sinus
collects blood from the deeper side of the brain
Straight sinus
goes to sigmoid sinus (R and L)
Transverse sinus
final collecting point before going to SVC thru interjugular vein then right atrium
Sigmoid sinus
elevates ridges
- Gyri
- 83% of total brain mass
CEREBRAL HEMISPHERES
shallow grooves
- Sulci
deeper grooves separating large regions of brain
- Fissures
separate cerebral hemispheres from each other
Median longitudinal fissure
separates hemispheres from cerebellum below
Transverse cerebral fissure
5 LOBES
- Frontal
- Parietal
- Temporal
- Occipital
- Insula
SULCUS
- Central sulcus
- Parieto-occipital sulcus
- Lateral sulcus
- executive suite
CEREBRAL CORTEX
cerebral cortex contains three kinds of functional areas
o motor areas
o sensory areas
o association areas
- all neurons in the cortex are
interneurons
consciously control the precise or skilled voluntary movements of our skeletal muscles
Primary (Somatic) Motor Cortex
BA 4
- Control voluntary movement
MOTOR AREAS
A mapping of the body in CNS structures is called
somatotopic organization
controls learned motor skills of repeated or pattern nature
Pre-motor Cortex
BA 6
responsible for directing the muscles involved in speech production
Broca’s area
BA 44, 45
controls voluntary movement of the eyes
Frontal-Eye-Field
BA 8
concerned with the individual’s personality
Pre-frontal cortex
BA 9, 10, 11, 12
Integrate sensory inputs
Primary Somatosensory Area
BA 3, 1, 2
To relate information received by the primary visual area to past visual experiences, thus enabling the individual to recognize and appreciate what he or she is seeing
Secondary visual area
BA 18, 19
To receive and integrate different sensory modalities
Somesthetic Association Area
BA 5,7
Receives visual information
Primary visual cortex
BA 17
Receiving auditory
Primary Auditory cortex (Heschl’s gyrus)
BA 41-42
- receiving inputs from multiple senses and sending outputs to multiple areas
ASSOCIATION AREAS
- It is involved with intellect, complex learning, abilities (cognition), recall, ambition, sense of purpose, insight, foresight and personality
ANTERIOR ASSOCIATION AREA
- Contains working memory
ANTERIOR ASSOCIATION AREA
- Abstract ideas, reasoning, persistence and planning
ANTERIOR ASSOCIATION AREA
- Recognizing patterns and faces
POSTERIOR ASSOCIATION AREA
o Area for naming objects
POSTERIOR ASSOCIATION AREA
- Provides emotional impact
LIMBIC ASSOCIATION AREA
- Provides the sense of “danger”
LIMBIC ASSOCIATION AREA
- About 90% has greater control over language abilities, math, and logic
LEFT HEMISPHERE
- More free-spirited, involved in visual-spatial skills, intuition, emotion, and artistic and musical skills
RIGHT HEMISPHERE
a disruption of the patterning and execution of learned motor movement
- Apraxia
o inability to recognize objects by touch
Astereognosia
a. Involving the ears and eyes
- Sensory aspect (language input)
a. Involving vocalization
- Motor aspect (language output)
inability to understand the spoken word
receptive aphasia
inability to understand the written word
to visual receptive aphasia/dyslexia
- Inability to interpret the thought heard via spoken word AND written word that was read
WERNICKE’S APHASIA
- Capable of deciding what he or she wants to say but cannot make the vocal system emit words instead of noises
BROCA’S APHASIA
- Total dement for language understanding or communication
GLOBAL APHASIA
Paleocerebellum
Anterior
Spino
Posture & tone
Archi
Flocculonodular
Vestibulo
Balance
Neocerebellum
Posterior
Fine movement
Coordination
- Is the region of the brain that connects the spinal cord to the base of the rest of the brain
BRAINSTEM
- Also known as the “mesencephalon”
MIDBARIN
- It is the smallest region of the brainstem, located just superior to the pons
MIDBARIN
o Is a collection of four nuclei located on the dorsal surface of the midbrain
Corpora Quadrigemina
- Contains ascending and descending tracts and several nuclei
PONS
initiates rapid movement sleep
pontine sleep center
works with the respiratory centers in the medulla oblongata to help control respiratory movement
pontine respiratory center
- Is the most inferior part of the brainstem
MEDULLA OBLONGATA
o Are two prominent enlargements on the anterior surface
- PYRAMIDS
- Contains sensory and motor tracts, cranial nerve nuclei, and related nuclei
MEDULLA OBLONGATA
o Are two rounded, oval structures, protrude from the anterior surface of the medulla oblongata just lateral to the superior ends of the pyramids
- OLIVES
- Is attached to the brainstem posteriorly via pons
CEREBELLUM
the white matter of the medulla that resembles a branching tree
- ARBOR VITAE
o Ridges found on the cerebellum cortex that are contained in the cerebellar lobules
- FOLIA
Cerebellum 3 parts
o Flocculonodular lobe
o Vermis
o Lateral Hemispheres
o Divides the lateral cerebellar hemispheres into anterior and posterior lobes
- PRIMARY FISSURE
- “Sensory relay station/center for information” coming into cerebral cortex
THALAMUS
o Divides the cerebellum and interior surfaces
- HORIZONTAL FISSURE
- Forms a central core of brain tissue superior to the midbrain
DIENCEPHALON
o Connects the two thalamic mass
- INTERTHALAMIC ADHESION (INTERMEDIATE MASS)
- The “central controller of endocrine system” and “major coordinating center of the ANS”
HYPOTHALAMUS
- Small area immediately inferior to thalamus
SUBTHALAMUS
Nuclei: Involved in controlling motor function
o Subthalamic nuclei
- Small area superior and posterior to thalamus
EPITHALAMUS
Involved in motivational control or behavior
o Habenula/habenular nucleus