Brain - Chapter 15 Flashcards
What are the 4 major regions of the brain?
Cerebrum, Diencephalon, Brain Stem, Cerebellum
Gray matter houses of Nerval Tissue Areas:
motor neuron and interneuron cell bodies, dendrites, telodendrion
Unmyelinated axons form the what?
cortex
What does the cortex do for the brain?
cover the surface of the adult brain
What is the white matter of the brain made of?
myelinated axons
Where is the white matter located in comparison to the gray matter?
deep to gray matter
Ganglion
cluster of neuron cell bodies within PNS
Center
group of CNS neuron cell bodies with common function
Nucleus
center that displays discrete anatomic boundaries
Nerve
Axon bundles (PNS)
Nerve Plexus
network of nerves
Tract
CNS axon bundle where axon have similar function and share common origin and destination
Funiculus
Group of tracts in specific area of spinal cord
Pathway
connect CNS with body origins and systems
What are the functions of the cranial meninges? (4)
-separate soft tissue of brain from bones of the cranium
-enclose and protect blood vessels that supply brain
-contain and circulate cerebrospinal fluid
-form veins that drain blood from brain
What is Cerebrospinal Fluid (CSF)?
circulates in the ventricles and subarachnoid space
What produces CSF?
ependymal cells of the choroid plexus
Function of CSF (3)
- Buoyancy: bone floats in CSF
- Protection: liquid cushion from sudden movements
- Environmental Stability: transports nutrients and removes waste
What is the function of the Blood Brain Barrier (BBB)?
regulates what substances can enter the interstitial fluids of brain
Which cells contribute to the BBB?
capillary endothelial cells and astrocytes
Where is the BBB missing or reduced in the CNS?
Choroid plexus, hypothalamus, pineal gland
Location of conscious thought processes and origin of intellectual functions
Cerebrum
The Cerebral cortex (outer layer of the cerebrum) is composed of what matter?
gray matter
The inner layer of the cerebrum is composed of what matter?
white matter
Regions of gray matter deep to white matter are called what?
cerebral nuclei
What are the gyri?
elevated ridges of surface folds
What are sulci?
shallow region of surface folds
Deeper grooves than sulci are called what?
fissures
What is Hemisphere Lateralization?
hemispheres appear as autonomic mirror images
List the Lobes of the Cerebrum (5)
Frontal Lobe, Parietal Lobe, Temporal Lobe, Occipital Lobe, Insula
The Frontal Lobe houses what?
Precentral gyrus
What does the frontal lobe (—> precentral gyrus) control?
Voluntary motor function, concentration, verbal communication, decision making, planning, and personality
What does the Parietal Lobe house?
Postcentral gyrus
What does the parietal lobe (—> postcentral gyrus) control?
General sensory functions
What does the Temporal Lobe control?
Hearing and smell
What does the Occipital Lobe control?
Process incoming visual information and store visual memories
What does the Insula control?
memory and interpretation of taste
What are the 3 Motor Areas of the Cerebrum?
Primary Motor Complex, Motor Speech Area (Broca’s Axis), and Frontal Eye Field
What does the Primary Motor Complex control?
voluntary skeletal muscle activity
What does the Motor Speech Area (Broca’s Axis) control?
muscle movement necessary for vocalization
Which Motor Area controls and regulates eye movements and binocular vision?
Frontal Eye Field
What are the 5 Sensory Areas of the Cerebrum?
Primary Somatosensory Cortex, Primary Visual Cortex, Primary Auditory Cortex, Primary Gustatory Cortex, Primary Olfactory Cortex
Where is the Primary Somatosensory Cortex located?
Postcentral gyrus
What is the function of the Primary Somatosensory Cortex?
receive general somatic sensory information
Where is the Primary Visual Cortex located?
The occipital lobe
Where is the Primary Auditory Cortex located?
the temporal lobe
What is the function of the Primary Visual Cortex?
receive and process incoming visual information
What is the function of the Primary Auditory Cortex?
receive and process incoming auditory information
Where is the Primary Gustatory Cortex located?
the Insula
What is the function of the Primary Gustatory Cortez?
process taste information
Where is the Primary Olfactory Cortex located?
the temporal lobe
What is the function of the Primary Olfactory Cortex?
provide conscious awareness of smell
What are the 6 Association Areas of the Cerebrum?
Premotor Cortex, Somatosensory Association Area, Auditory Association Area, Visual Association Area, Wernicke’s Area, Gnostic Area.
What is the function of the Premotor Cortex?
processes motor impulses and coordinated learned skilled motor activities
What is the function of the Somatosensory Association Area?
integrate and interpret sensory information
What is the function of the Auditory Association Area?
interpret visual information
What is the function of Wernicke’s Area?
recognize and comprehend spoken and written language
What is the function of the Gnostic Area?
interpret all sensory, visual, and auditory information
What is the function of the Association Tract?
connect/link areas in the same hemisphere
What is the Association Tract composed of?
Arcuate fibers and longitudinal fasciculi
What is the function of Arcute fibers?
link one gyri to another in same hemisphere
What is the function of longitudinal fasciculi?
link gyri between different central lobes of the same hemisphere
The Commissural Tracts connect/link what?
left and right hemispheres
The Projection Tracts connect/link what?
connect all of central cortex
What are Cerebral Nuclei?
paired masses of gray matter deep in central white matter in basal region of cerebral hemispheres
What does the Caudate Nucleus control?
patterned arm and log movements associated with walking
What is the Amygdaloid Body control?
expression of emotions/mood and control behavioral activities
What does the Putamen control?
subconscious muscular movement
What is the function of the Globus Pallidus?
excite and inhibit activities of the thalamus to control and adjust muscle tone
What is the function of the Claustrum?
process visual information
What is the Diencephalon composed of which parts? (3)
Epithalamus, Thalamus, and Hypothalamus
The penial gland and habenular nuclei are located in which Diencephalon part?
Epithalamus
What does the Penial Gland secrete?
Melatonin
What is the job of melatonin?
regulate day-night cycle (circadian rhythm)
What is the function of the habenular nuclei?
relay signals from limb system to mesencephalon; visceral and emotional response to odor
What is the Thalamus?
the principal and final relay point for sensory information to be processed and projected to somatosensory cortex
What are the functions of the Hypothalamus?
- control ANS
- control endocrine system
- body temperature regulation
- control emotional behavior
- control food and water intake
- regulate circadian rhythms
What does the brainstem connect?
forebrain and cerebellum to spinal cord
What are the 3 regions of the brainstem?
Mesencephalon, Pons, and Medulla Oblongata
What are the portions that make up the Mesencephalon? (3)
Tegmentum, Substantia nigra, and Tectum
What are the functions of the Tegmentum?
integrate information from cerebrum and cerebellum
What does the Tegmentum control?
involuntary motor commands to the erector and spinae muscles of the back to maintain posture
Which reflex centers do the Tectum control?
Visual and Auditory
Degradation of the Substantia nigra leads to what disease?
Parkinson’s Disease
What are the 2 regulatory centers of the Pons?
Pneumotaxic and Apneustic center
The Pneumotaxic and Apneustic centers are responsible for what?
setting basic pattern of breathing
Which cranial nerves are part of the Pons?
CN V - VIII
What is the role of the Superior Olivaris Complex Nuclei?
receive auditory input and pathways for sound localization
All communication between the brain and spinal cord is controlled via what?
medulla oblongata
The longitudinal ridges of the medulla oblongata are called the what?
pyramids
The pyramids house motor projection tracts called what?
corticospinal tracts
Olive in the Medulla Oblongata has what function?
relay sensory joint position information of cerebellar cortex
CN nuclei associated with Medulla
CN VIII - XII
The nucleus cuneatus receive somatic sensory information from where?
upper limbs
The nucleus gracilis receive somatic sensory information from where?
lower limbs
The Cardiac Center, Vasomotor Center, and Respiratory Center control what?
blood pressure
What are the 3 regions of the Cerebellum?
- Outer gray matter layer of cortex
- Inner white matter
- Cerebellar nuclei
fold of Cerebellum are called
folds
The 2 hemispheres of the Cerebellum (anterior lobe and posterior lobe) are separated by what?
primary fissure
What does the vermis do?
separate left and right cerebellar hemisphere
What is the function of the vermis?
receive sensory input on torso position and balance
What are the functions of the limbic system?
- process and experience emotions
- effect memory formation through integration of past memories of physical sensations with emotional state
CN I
olfactory
CN II
optic
CN III
oculomotor
CN IV
trochlear
CN V
trigeminal
CN VI
abducens
CN VII
facial
CN VIII
vestibulocochlear
CN IX
glossopharyngeal
CN X
vagus
CN XI
accessory
CN XII
hypoglossal
Which cranial nerves are purely sensory?
CN I and CN II
Which cranial nerves are purely motor
CN XII