Neurogenics Chapter 1 Flashcards
Neuroanatomy & Neuropathology Material!
Nervous system is divided in two groups:
CNS- Central Nervous System
PNS- Peripheral Nervous System
CNS consists of :
Brain
Spinal Cord
PNS consists of:
Cranial Nerves 12 pairs
Spinal Nerves 31 pairs
Sensory information is ___________
AFFERENT (in to cell body)
Motor information is _____________
EFFERENT (out of cell body)
What is released during the synapse?
Neurotransmitters
What neurotransmitter is very important for muscle movement?
ACH (Acetilcholine)
Brainstem consists of:
- medulla- attaches to spinal cord
- pons
- midbrain
What is a very important function of the CEREBELLUM?
Coordinates and modulates force and range of movement
What are the main structures in the DIENCEPHALON?
- Thalamus (largest) -RELAY STATION
- Hypothalamus
- 3rd ventricle
Basal Ganglia plays a huge role in the _____________ and facilitation of movement
Inhibition
Damage to basal ganglia can cause:
Dysarthrias or dyskinesias
What are cerebral ventricles?
Interconnected cavities filled with CSF
Where is CSF produced ?
Choroid Plexus!
The Corpus Callosum connects the two…..
hemispheres
The fiber tracts in the CNS make up the __________matter of the brain
WHITE
There are 3 main fiber tracts in the CNS. Which are they? (PCA)
- Projection fibers
- Commisural fibers
- Association fibers
SHORT fibers connect ___________areas , LONGER fibers connect _____________ areas.
adjacent, distant
Longer fibers are also called ____________.
fasiciculi
Projection Fibers
- Carry info long distances
- Transmit SENSORY (afferent) info to brain
- Transmit MOTOR (efferent) info to muscles and glands in cortical areas
Those projection fibers near cortex arranged in FAN-LIKE area is called….
CORONA RADIATA
The area where those fibers are compacted and concentrated is called….
INTERNAL CAPSULE
UMN are ___________.
LMN are ____________.
UMN= tracts
LMN=nerves
Projection Fibers make up several 3 important pathways which are:
- Pyramidal pathway **
- Extra pyramidal pathway **
- Vestibular-reticular system
Which pathway is responsible of carrying VOLUNTARY MVMT messages?
a. extra pyramidal
b. pyramidal
c. vestibular-reticular system
B. PYRAMIDAL!
* it passes through an area called pyramids in the brainstem.
The pyramidal pathway has 2 different group of nerve fibers (tracts):
1) Corticobulbar tract
2) Corticospinal tract
The CORTICOBULBAR TRACT sends info from ______________ to the _______________. The fibers synapse with the _________________.
CORTEX to the BRAINSTEM.
Fibers synapse with Cranial Nerves!
The CORTICOSPINAL TRACT sends info from ______________ to the _______________. The fibers synapse with the _________________.
CORTEX to the SPINAL CORD.
Fibers synapse with the Spinal Nerves!
The cells of the UMN are located in and around the:
a. temporal lobe
b. primary motor cortex
c. primary sensory cortex
B. Primary motor cortex!
The pyramidal pathway is _________.
a. direct
b. indirect
A. DIRECT
* it travels straight from cortex to the neurons in brainstem or spinal cord. ONLY ONE SYNAPSE.
Association Fibers
- Can be short of long but ALL connect areas within ONE HEMISPHERE
- Help maintain communication among structures within a hemisphere
Which is one of the MOST IMPORTANT association fibers?
ARCUATE FASCICULUS (superior longitudinal)
- connects broca’s and wernicke’s area
- important for language acquisition, meaningful/purposeful lang. production, & verbal memory
What are two other association fibers?
- cingulum
* unicinate fasiculus
True of False:
Association fibers are intrahemispheric fibers.
TRUE
* They connect structures WITHIN the hemispheres
Commisural Fibers
- Connect corresponding areas of the 2 hemispheres which are divided by the longitudinal fissure.
Which is the MOST important and the LARGEST commisural fiber?
CORPUS CALLOSUM
- damage to corpus callosum disconnects 2 hemispheres
- results in problems w/ movement, reading and naming (disconnection syndromes)
The OUTER layer of the brain is called _______________
Cerebrum/cerebral cortex
A) Hills in the brain are called _________.
B) Valleys in the brain are called __________.
a) Gyri
b) Sulci
The 2 hemispheres in the cerebrum are divided by the : ___________
LONGITUDINAL FISSURE
What divides the anterior half of the brain from the posterior half?
a) longitudinal fissure
b) central sulcus
c) Fissure of Rolando
d) B & C
D- Fissure of Rolando and central sulcus are the same thing! (different names)
The _______________ begins at inferior frontal lobe and move laterally and upward.
Sylvian fissure (lateral cerebral fissure)
The cortex is usually divided in 2 functional categories:
- Primary cortex
* Association cortex/areas
The primary cortex is responsible for specific __________ and _________ information.
motor and sensory!
What are the important PRIMARY CORTICES?
- Primary Motor Cortex (frontal)
- Primary Sensory Cortex (parietal)
- Primary Visual Cortex (occipital)
- Primary Auditory Cortex (temporal)
- Primary Olfactory Cortex (frontal)
What are the association areas responsible for?
Interpreting sensory information and planning motor activity
FRONTAL LOBE
- Primary motor cortex
- Broca’s area
- Frontal association area - strip in front of primary motor cortex. Important for planning and voluntary mvmts.
- Homunculus - represents allocation of motor function in the motor cortex
PARIETAL LOBE
- Lies behind central fissure and above lateral fissure
- Primary Sensory Cortex - lies just behind the central fissure
- Parietal association area - behind primary sensory cortex and it is important for processing tactile info
What are the TWO important gyri in the PARIETAL lobe that are important for language!
1) SUPRAMARGINAL gyri
2) ANGULAR gyri
Damage to the SUPRAMARGINA GYRI can cause:
a) alexia
b) anomia
c) agraphia
d) Conduction aphasia
e) C & D
E- Agraphia (writing problems) & Conduction aphasia
Damage to the ANGULAR Gyrus can cause?
naming, reading, writing problems
& transcortical sensory aphasia
OCCIPITAL LOBE
- Primary Visual Cortex
TEMPORAL LOBE
- Primary Auditory Cortex
- Wernicke’s area
- Insula - structure hidden in the lateral cerebral fissure by the “operculum”
- Temporal association area
What are 3 important gyri in the TEMPORAL LOBE?
1) Superior temporal
2) Middle temporal
3) Inferior temporal
True or False:
Speech is mostly a VOLUNTARY movement.
TRUE
Explain the process of how VOLUNTARY mvmt for occurs…
- PRE-MOTOR cortex makes the plan (Broca’s area)
- Sends the intended info to the PRIMARY MOTOR cortex.
- The info leaves the cortex and sends it through the fibers (corona radiata) via the pyramidal tract.
- For SPEECH it goes through the corticobulbar
- For BODY mvmts it goes through the corticospinal
Which is the main artery of the heart?
AORTA
The aortic arch divides into 4 branches:
2 COMMON CAROTID arteries
2. SUBCLAVIAN arteries
The COMMON CAROTID arteries brain into:
Internal carotid
External carotid