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The Types of Brain Cancer

  The Types of Brain Cancer Brain tumors are broadly classified based on where they originate ( primary or metastatic ) and the type of cell they arise from. 1 The World Health Organization (WHO) also assigns a grade from I to IV based on how aggressive the cells are. 2 Here is an overview of the types of brain cancer and tumors: 1. Primary Brain Tumors 3 These tumors originate within the brain or spinal cord tissue. 4 They are often named after the cells they resemble. 5 A. Gliomas (The Most Common Type) Gliomas arise from glial cells , the supportive cells of the brain. 6 They are categorized by the specific type of glial cell they develop from: 7 Type of Glioma Originating Cell Common Grade Key Characteristics Glioblastoma (GBM) Astrocytes (or mixed) Grade IV (Highest) The most common and most aggressive, malignant (cancerous) primary brain tumor in adults. Astrocytoma Astrocytes Grade II, III, or IV (GBM) Can occur throughout the brain; often infiltrative (grow into su...
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GETTING INFORMATION IN AND OUT OF THE BRAIN

GETTING INFORMATION IN AND OUT OF THE BRAIN Getting information into and out of the brain relies on the Central Nervous System (CNS) and the Peripheral Nervous System (PNS) working together via specialized neural pathways. The flow of information is categorized into two main directions: Input ( Afferent /Sensory): Information coming into the CNS (brain and spinal cord ). Output ( Efferent /Motor): Information going out of the CNS to the body's effectors (muscles and glands). 👂 Input: Sensory (Afferent) Pathways Sensory information from the environment (e.g., sight, touch, pain) travels toward the brain via sensory neurons . Peripheral Receptors : Specialized sensory receptors in the skin, eyes, ears, and internal organs detect stimuli (e.g., pressure, light, chemical signals). Transmission: This detection generates an electrical impulse (action potential) in a sensory neuron . Ascending Tracts: The impulse travels along the nerve fibers (axons) through peripheral nerves...
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IS THE BRAIN ONE BIG COMPUTER?

IS THE BRAIN ONE BIG COMPUTER? The brain functions as an incredibly sophisticated electrical and chemical machine , using a seamless two-step process to transmit and process information via its fundamental unit, the neuron (nerve cell). 1 The communication within the brain relies on the following cycle: ⚡ 1. The Electrical Signal (Action Potential) 2 Information travels rapidly within a single neuron as an electrical signal called an action potential (or nerve impulse). 3 Basis: The neuron maintains an electrical charge difference, or resting membrane potential , across its cell membrane, established by an unequal distribution of positively and negatively charged ions (primarily Sodium ( 4 $Na^+$ ), Potassium ( 5 $K^+$ ), and Chloride ( 6 $Cl^-$ )) inside versus outside the cell. 7 Firing: When a neuron receives enough stimulation from its neighbors to reach a specific voltage threshold, voltage-gated ion channels rapidly open. 8 This causes a sudden, massive influx of positiv...
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