Anatomy and Physiology of the Nervous System Flashcards
Convolutions of gray matter composed of gyri (crests) and sulci (fissures)
Cerebral Hemispheres (Telencephalon)
Separates temporal lobe from frontal and parietal lobes
Lateral central fissure (Fissure of Sylvius)
Separates the two cerebral hemispheres
Longitudinal Cerebral Fissure
Separates the Frontal lobe from the Parietal lobe
Central Sulcus
What are the 6 lobes of the cerebral hemisphere
- Frontal Lobe
- Parietal Lobe
- Temporal Lobe
- Occipital Lobe
- Limbic Lobe
- Insular Lobe
Primary motor cortex for voluntary muscle activation
Frontal Lobe - Precentral Gyrus
This region controls emotions and judgements
Frontal Lobe - Prefrontal Cortex
This region controls motor aspects of speech
Frontal Lobe - Broca’s area
This region is the primary sensory cortex for integration of sensation.
Parietal Lobe - Postcentral Gyrus
This region receives fibers conveying touch, proprioception, pain, and temperature sensations from the opposite side of the body.
Parietal Lobe - Postcentral Gyrus
This region receives and processes auditory stimuli
Temporal Lobe - Primary Auditory Cortex
this region processes auditory stimuli
Temporal Lobe - Associative Auditory Cortex
This area is responsible for Language Comprehension
Temporal Lobe - Wenicke’s area
This region receives and processes visual stimuli
Occipital Lobe - Primary Visual Cortex
This region processes visual stimuli
Occipital Lobe - Visual Association Cortex
This region is deep within the lateral sulcus, and is associated with visceral functions.
Insula
This region consists of the limbic lobe, hipocampal formation, amygdaloid nucleus, hypothalamus, and anterior nucleus of thalamus
Limbic System
The Limbic system is comprised of what regions?
- Limbic Lobe
- Hippocampal Formation
- Amygdaloid Nucleus
- Hypothalamus
- Anterior Nucleus of Thalamus
This is phylogenetically the oldest part of the brain
Limbic System
This region of the brain is concerned with instincts and emotions contributing to preservation of the individual
Limbic System
What are the 4 basic functions of the limbic system?
- Feeding
- Aggression
- Emotions
- Endocrine Aspects of Sexual Response
These are myelinated nerve fibers located centrally within the brain.
White Matter
These fibers interconnect the two hemispheres, including the corpus callosum (largest region), anterior commissure, and hippocampal commissure.
Transverse Commissural Fibers
These fibers connect cerebral hemispheres with other portions of the brain and spinal cord
Projection Fibers
These fibers connect different portions of the cerebral hemispheres, allowing cortex to function as an integrated whole.
Association Fibers
___________ is a collection of masses of gray matter deep within the cerebral hemisphers
Basal Ganglia
What are the internal structures of the Basal Ganglia? (4)
- Striatum (Caudate Nucleus, Nucleus Accumebens, Putamen)
- Globus Pallidus (External/Internal Segments)
- Sub-thalamic Nucleus
- Substantia Nigra (Compact and Reticular Parts)
The term Lenticular Nucleus refers to the ___________ and ___________
- Putamen
2. Globus Pallidus
The Basal Ganglia forms an associated motor system (extrapyramidal cells) with other nuclei in the ___________ and the ___________
- Sub-thalamus
2. Midbrain
Multiple circuits exist in the basal ganglia, what are the 3 main ones?
- Oculomotor Circuit (Caudate Loop)
- Motor Loop (Putamen Loop)
- Limbic Circuit
This circuit in the basal ganglia originates in the frontal and supplementary motor eye fields.
Oculomotor Circuit (Caudate Loop)
This circuit in the basal ganglia functions with saccadic eye movements
Oculomotor Circuit (Caudate Loop)
This circuit in the basal ganglia originates in the precentral motor and postcentral somatosensory areas.
Motor Loop (Putamen Loop)
What is the function of the Motor Loop (Putamen Loop) in the basal Ganglia?
- Excits putamen neurons
- Putamen cells inhibit Globus Pallidus neurons
- Boosts activity in the ventral lateral nucleus and supplementary motor area
- Functions to scale amplitude and velocity of movements
- Reinforces selected pattern
- Suppresses conflicting patterns
- Preparatory for movement (i.e. motor set, anticipatory movement)
This circuit in the basal ganglia originates in the prefrontal and limbic areas of the cortex, to the basal ganglia, to the prefrontal cortex.
Limbic Circuit
What is the function of the limbic circuit in the basal ganglia?
- Functions to organize behaviors (executive functions, problem solving, motivation)
- Procedural Learning
The Diencephalon is comprised of what (4) regions?
- Thalamus
- Sub-thalamus
- Hypothalamus
- Epithalamus
What are the 3 regions of the Thalamus in the Diencephalon?
- Sensory Nuclei
- Motor Nuclei
- Other Nuclei
What is the function of the sensory nuclei within the thalamus of the diencephalon?
Integrate and relay sensory information from the
1. Body
2. Face
3. Reina
4. Cochlea
5. Taste Receptors
to the cerebral cortex and subcortical regions
What is the function of the motor nuclei within the thalamus of the diencephalon?
Relay motor information from the Cerebellum and globus pallidus to precentral motor cortex
What is the function of the other nuclei within the thalamus in of the diencephalon?
Assist in integration of visceral and somatic functions
This region of the Diencephalon is involved in control of several functional pathways for sensory, motor and reticular functions.
Subthalamus
This region of the Diencephalon integrates and controls the function of the Autonomic nervous system and the Neuroendrocine system
Hypothalamus
This region of the Diencephalon regulates body temp. eating, water balance, anterior pituitary function, sexual behavior, and emotions
Hypothalamus
What are the two important regions o the epithalamus?
- Habenular Nuclei
2. Pineal Gland
This region of the epithalamus integrates olfactory, visceral, and somatic afferent pathways
Habenular Nuclei
This region of the epithalamus secretes hormones that influence the pituitary gland and several other organs
Pineal Gland
This midbrain is also known as the ___________
Mesencephalon
The midbrain connects the ___________ to the ___________
Pons to the Cerebellum
The ___________ connects the midbrain to the cerebellum
Superior Peduncle
The midbrain contains ___________ ___________, two lateral halves, each divided into an anterior part and a posterior part
Cerebral Peduncles
The midbrain contains cerebral peduncles, two lateral halves, each divided into an anterior part of basis (___________ and ___________) and a posterior part (___________)
Anterior Part - Crus Cerebri & Substantia Nigra
Posterior Part - Tegmentum
The tegmentum of the midbrain, which is the posterior part, contains all the ___________ and ___________
Ascending tracts
some descending tracts
The tegmentum of the midbrain contains all ascending tracts and some descending tracts, the ___________ receives fibers from the cerebellum.
Red Nucleus
The tegmentum of the midbrain contains all ascending tracts and some descending tracts, the red nucleus receives fibers from the cerebellum. The Tegmentum is also the origin for the _________ tract
Rubrospinal tract
The rubrospinal tract, found in the midbrain of the tegmentum along the posterior aspect is responsible for ____________?
Coordination
What cranial nerve nuclei are found along the tegmentum of the midbrain?
III Oculomotor 3
IV Trochlear 4
The __________ in the midbrain of the brainstem is a large motor nucleus connecting with the basal ganglia and the cortex.
Substantia Nigra
The Substantia Nigra in the midbrain of the brainstem is a large motor nucleus connecting with the ___________ and ___________
Basal Ganglia
Cortex
the Substantia Nigra is important for what function(s)?
Motor Control
Muscle Tone
Within the midbrain, ___________ is an important relay station for vision and visual reflexes.
Superior Colliculus
Within the midbrain, ____________ is an important relay station for hearing and auditory reflexes.
Inferior Colliculus
This region within the midbrain contains endorphin-producing cells, (important for the suppression of pain) and descending autonomic tracts.
Periaqueductal Gray
The periaqueductal gray contains endorphin-producing cells that are important for the …
Suppression of pain
What are the 3 regions of the brainstem?
- Midbrain
- Pons
- Medulla Oblongata
This region of the brainstem connects the medulla oblongata to the midbrain, allowing for passage of important ascending and descending tracts
Pons