PSYU2236 W4 | Neuroanatomy

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Questions and Answers

What is a neuron?

A neuron is a specialized cell in the nervous system that transmits information through electrical and chemical signals.

What are glial cells?

Glial cells are supportive cells in the nervous system that have various functions, including maintaining homeostasis and providing support and protection for neurons.

What are EPSP and IPSP?

EPSP stands for excitatory postsynaptic potential, while IPSP stands for inhibitory postsynaptic potential.

What does the action potential refer to?

A rapid change in membrane potential Signup and view all the answers

Cerebrospinal fluid (CSF) is produced in the __________.

choroid plexus Signup and view all the answers

What are the roles of the somatic nervous system?

The somatic nervous system controls voluntary movements and conveys sensory information from the skin to the central nervous system. Signup and view all the answers

What is the function of the hypothalamus?

Regulates hormone release Signup and view all the answers

What happens when depolarization reaches a threshold?

An action potential occurs. Signup and view all the answers

Which of the following statements about the blood-brain barrier is true?

It prevents most substances from passing without regulation. Signup and view all the answers

What is the primary role of the occipital lobe?

Processing visual information. Signup and view all the answers

Match the following brain lobes with their primary functions:

Frontal Lobe = Motor functions and decision making Parietal Lobe = Processing sensory information Temporal Lobe = Auditory functions and memory Occipital Lobe = Visual processing Signup and view all the answers

What is the primary function of the amygdala?

Processing emotional stimuli Signup and view all the answers

Damage to the amygdala results in increased fear.

False Signup and view all the answers

What type of memory is associated with the hippocampus?

Long-term episodic memory Signup and view all the answers

Which of the following conditions is associated with memory loss due to damage in the hippocampus?

Patient H.M. Signup and view all the answers

What does the cingulate gyrus process?

Pain and emotional pain Signup and view all the answers

Damage to the cingulate gyrus prevents the sensation of pain.

False Signup and view all the answers

The basal ganglia are important for which of the following functions?

Movement Signup and view all the answers

The _____ is part of the relay system between the striatum and the thalamus.

Globus Pallidus Signup and view all the answers

What is the role of the thalamus?

Relay sensory information to the cerebral cortex Signup and view all the answers

Which structure is involved in the regulation of motivated behaviors?

Hypothalamus Signup and view all the answers

What does the ventral tegmental area primarily produce?

Dopamine Signup and view all the answers

The nigrostriatal pathway is the first pathway to degrade in Parkinson's disease.

True Signup and view all the answers

What type of information does the hypothalamic-pituitary adrenal (HPA) axis control?

Stress response Signup and view all the answers

Which brain structures are part of the basal ganglia?

Caudate nucleus, Putamen, Nucleus Accumbens Signup and view all the answers

Match the brain parts with their primary functions:

Amygdala = Processing emotional stimuli Hippocampus = Long-term episodic memory Cingulate Gyrus = Processing pain Hypothalamus = Regulating hormones Signup and view all the answers

Study Notes

The Neuron

Neurons are the fundamental units of the nervous system, comprising dendrites, soma, axon, and terminals.
Neurons are classified into various types, each serving distinct functions.
Glial cells support neurons and have specialized functions, including maintaining homeostasis, forming myelin, and providing support and protection.
Action potential initiates when resting potential changes, regulated through membrane potential.
Threshold level of depolarization triggers action potential.

The Synapse

Neural integration occurs through excitatory postsynaptic potentials (EPSP) and inhibitory postsynaptic potentials (IPSP).
Membrane potential changes are integrated at the axon hillock; reaching threshold generates an action potential.
Communication between neurons happens across synapses, which can be chemical or electrical.
Neurotransmitter release is via exocytosis and endocytosis through ion-ion channels linked to neurotransmitter binding.
Neuropharmacology involves agonists that enhance function and antagonists that reduce function in metabotropic receptors.

Overview of the Nervous System

The nervous system is divided into the central nervous system (CNS) and peripheral nervous system (PNS).
CNS includes the cerebrum, cerebellum, brain stem, and spinal cord; it regulates emotions, sensations, movements, reasoning, and bodily functions.
PNS connects the CNS to the rest of the body and further divides into somatic (voluntary) and autonomic (automatic) systems.

Central Nervous System Functions

Regulates emotions and sensations, coordinates limb movement, and facilitates reasoning and judgment.
Maintains homeostasis and plays a crucial role in learning and memory.

Anatomical Directions

Anatomical terms identify directions: rostral (front) vs. caudal (back), dorsal (top) vs. ventral (bottom), medial (middle) vs. lateral (side).

Ventricles and Cerebrospinal Fluid (CSF)

The CNS forms as a tube with central canals and four brain ventricles (lateral, third, fourth, and cerebral aqueduct).
CSF produced in the choroid plexus protects and nourishes the brain and spinal cord, circulating through the ventricles.

Meninges and Subarachnoid Space

Meninges provide cushioning, buoyancy, and transport nutrients/waste between the CNS and blood.
CSF serves as a cushion and nutrient transport system and is reabsorbed into venous blood after circulation.

Blood-Brain Barrier

Comprised of tightly packed endothelial cells acting as a physical barrier to restrict substance passage.
Some small, fat-soluble molecules can cross; larger, water-soluble substances are selectively barred or actively transported.

Peripheral Nerves

The PNS includes cranial nerves and various spinal nerves (cervical, thoracic, lumbar, sacral, and coccygeal).
Sensory information travels through dorsal roots; motor impulses emerge from ventral roots.

Somatic Nervous System

Connects sensory input to the CNS and delivers motor output to muscles.
Motor neuron diseases like ALS involve degeneration of ventral roots.

Autonomic Nervous System

Sympathetic system activates responses for action; parasympathetic focuses on rest and digestion.
Both systems operate in parallel, with counteractive effects on bodily functions.

Hormones and the Nervous System

Hormones, regulated by the hypothalamus and pituitary gland, communicate information similar to neurotransmitters but act slower and have persistent effects.
Various hormones (GH, ACTH, TSH, etc.) play roles in regulating bodily functions, with feedback mechanisms for control.

Major Brain Systems

The brain includes significant structures: the cerebral cortex (motor and cognitive functions), limbic system (emotional processing), and basal ganglia (movement and motivation).
The cortex is divided into lobes (frontal, parietal, occipital, temporal), each linked to specific functions like motor control, sensory integration, and visual processing.

Limbic System

Composed of key components such as the amygdala and hippocampus, it regulates emotion and memory.
Damage can lead to issues with fear responses and memory recall.

Basal Ganglia

Associated with movement control and cognitive functions; dysfunction can result in conditions like Parkinson’s disease.
Involves direct pathways for simple movements and indirect pathways for learned responses.### Striatum and Brain Connectivity
Striatum composed of the caudate nucleus and putamen, vital for motivation and movement.
Increased relay between striatum and thalamus can slow processing.
Putamen regulates the Nucleus Accumbens (NaC), crucial for reward processing.
Nucleus Accumbens is linked to motivated behaviors, with implications for substance use disorders.
Activation of dopamine occurs with rewarding stimuli.

Globus Pallidus and Movement Regulation

Functions as a relay system between striatum and subthalamic nucleus to thalamus.
Essential for the regulation of voluntary movements.
Forms indirect pathways through loops with striatum and thalamus.

Thalamus as Relay Center

Acts as a relay station for sensory information to the cerebral cortex.
Contains multiple subunits, each serving distinct functions in sensory processing.
Facilitates communication between brain stem, cortex, striatum, and globus pallidus.

Hypothalamus Functions

Serves as a neuroendocrine center with numerous subregions managing hormone production and release.
Regulates critical behaviors: feeding, drinking, temperature control, sexual behavior, fight or flight response, and arousal.
Controls the hypothalamic-pituitary-adrenal (HPA) axis for stress response through cortisol release.

Dopaminergic Pathways

Ventral Tegmental Area (VTA) and Substantia Nigra are primary dopamine sources, influencing learned behavior and reward-seeking.
Mesocorticolimbic pathways connect VTA to the Nucleus Accumbens and frontal cortex.
Nigrostriatal pathway links substantia nigra with striatum; degradation in this pathway is a hallmark of Parkinson's Disease.

Comparative Brain Structure

Human brains possess a larger and more complex cortex compared to other mammals.
Subcortical structures, including basal ganglia and limbic system, are highly conserved across species.
Offers opportunities for modeling certain behaviors in animal studies.

Key Brain Systems Overview

Cerebral cortex has four main lobes: frontal (cognition, motor function), temporal (hearing, memory, emotion), parietal (sensory touch), and occipital (sight).
Limbic system is crucial for motivation and emotional context, including the amygdala, hippocampus, and cingulate gyrus.
Basal ganglia play roles in movement, cognition, and motivated behavior, integrating limbic and motor functions.
The hypothalamus is central to endocrine function and behavioral regulation through hormone activity.
VTA and substantia nigra provide essential dopaminergic pathways in the midbrain.

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Description

This quiz covers key concepts in biopsychology, focusing on the structure and function of neurons and synapses. It includes the classification of neurons and the role of glial cells as well as the mechanisms behind action potentials. Perfect for students exploring the fundamentals of neuroscience.