The expanded, front section of the central nervous system located within the skull. It is an incredibly intricate organ made up of billions of interconnected neurons and glial cells. The brain is a bilateral structure, meaning it has two sides, and can be divided into distinct lobes. Each lobe is linked to specific functions, but all parts of the brain work together to underpin our thoughts and behaviors.

Brain

Functioning as the central building blocks and core information processors of the nervous system, neurons are interconnected cells essential for all tasks the system performs. The human brain contains around 100 billion neurons at birth. Their role encompasses everything from simple reflexes to complex cognitive functions.

Neurons

Nervous system diseases affect the brain, spinal cord and nerves. These include structural, biochemical and electrical damages. Below are a few lists of diseases covered in 1Cademy:
- Guillain–Barré syndrome (GBS)
- Encephalopathy
- Anosmia
- Seizures
- Stroke
- Paralysis
- Ageusia

Neurological Diseases

The peripheral nervous system are all nerve components (nerve, ganglia) outside of the brain and spinal cord. The word "peripheral" describes its function in connecting limbs and organs to the central nervous system. It is functionally divided into two components:
- somatic nervous system
- autonomic nervous system

Peripheral Nervous System

The central nervous system consists mainly of the brain and spinal cord.  Messages are relayed between the central and peripheral nervous systems.

Central Nervous System

Neurological Disorders

- Brain
- Neurons
- Peripheral nervous system (PNS)
- Neurological diseases
- Central nervous system (CNS)

University of Michigan - Ann Arbor

The scientific field of study of nervous system function and development. The human nervous system is comprised of the central (brain and spinal cord) and peripheral  (nerves and ganglia branching from brain and spinal cord) nervous systems. These are referred to as the CNS and PNS, respectively.

Neuroscience (Neurobiology)

COVID-19 patients have shown symptoms of direct and indirect neurological effects, from changes in taste and smell, to immunologic factors in cerebral spinal fluid (CSF).  It is unknown whether these phenomena are the result of neurological damage, of SARS-CoV-2 infection, and/or of indirect effects of the immune response. Furthermore, studies in mice have shown that neurons are susceptible to infection, suggesting that cells of the CNS may contribute to the deteriorating breathing and respiratory function of COVID-19 patients. The image below is an early hypothesized mechanism of viral entry through nasal and oral mucosa cells, though there is not yet any evidence to support this hypothesis.

Effects of COVID-19 on the Central Nervous System

Even in the absence of typical respiratory symptoms such as fever, cough, and shortness of breath, various patients diagnosed with COVID-19 have presented neurological symptoms, such as:

- acute cerebrovascular diseases

- impaired consciousness

-  skeletal muscle injury

- encephalopathy (symptoms: ischemic stroke)

- loss of smell (anosmia) and taste (ageusia)

- stroke

- cranial nerve deficits

- delirium

- meningitis

- paralysis

- seizures

- neuroinflammatory syndromes

- high pressure CSF

- muscle stiffness

The list below includes less-common neurological symptoms of COVID-19:
- Guillain–Barré syndrome (GBS)
- Multisystem Inflammatory Syndrome in Children (MIS-C)

Neurological symptoms Presented in COVID-19 Patients

The study of the physiological basis for cognition.

Cognitive Neuroscience

An intersection between psychology, neuroscience and economics that studies how brain activation corresponds with decisions of gains and losses.

Neuroeconomics

As the relapse prevention model discusses, many individuals recovering from addiction return to their behavior at some point during/after treatment. Researchers have begun to look at this idea of relapse and relapse prevention from a neuroscience perspective. This perspective could help further the understanding of why, on a brain level, individuals relapse and how we could possibly help. There is not a large consensus yet, but the research is looking at many factors including pathways, styles, and stages of recovery, as well as the possibility of reversing or diminishing the brain dysregulation that results from addiction.

Neuroscience approach to relapse and relapse prevention

The study of behavior, emotion, and cognition and how they relate to brain function

Neuropsychology

This looks at how behavior and the environment are affecting the neural development of humans through their lifetime.

Behavioral Neuroscience

Discipline that is concerned with hormonal development, its interaction with the nervous system, its secretion and associated physiological and behavioral effects.

Neuroendocrinology

A distinct line of inquiry with the goal of understanding which systems of the brain are activated during mindfulness practice to determine the effects that both short and long-term practice has on brain function and structure.

Neurobiology of Mindfulness

The study of Emotion Regulation within the lens of Neurobiology. More specifically, understanding what brain functions correspond to Emotion Regulation. 

The Neurobiology of Emotion Regulation

Biopsychology, also known as biological psychology, is a subfield of psychology that examines the influence of biological processes on behavior. It typically focuses on the immediate causes of behavior rooted in the physiology of an organism, with a primary emphasis on the nervous system's structure and function. This field is highly interdisciplinary, drawing on expertise from researchers with backgrounds in biology, medicine, physiology, and chemistry, and is considered a key component within the broader field of neuroscience.

Biopsychology (Biological Psychology)

A human's nervous system is in charge of managing our cognitions, movements, and responses. It is comprised of billions of neurons, glial cells, and the central and peripheral nervous systems. 

Nervous System

A person accidentally touches a hot surface and immediately withdraws their hand. Which of the following best analyzes the roles of the two major divisions of the nervous system in this reflex action?

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