Because of the blood brain barrier, there is no normal microbiota in the spinal fluid.

Absence of Normal Microbiota of the Nervous System

Tight cell junctions of the blood vessel endothelia of the central nervous system, which prevent microbes from entering the bloodstream leading to the brain and cerebrospinal fluid. Infection of the CNS can lead to fatal inflammation.

University of Notre Dame

Epithelial cells that line the blood and lymphatic vessels, urogenital tract, and other tissues which defends against invading microbes.

Innate Immune Physical Barrier: Endothelia

Comprising the brain and the spinal cord, the Central Nervous System (CNS) serves as a primary division of the broader nervous system. Anatomical illustrations highlight its centralized location within the human body.

Central Nervous System (CNS)

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Blood-Brain Barrier

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 vital link between the brain and the external world, the spinal cord acts as an intelligent relay station. It is responsible for routing messages between the brain and the body through all of its segments, and it also independently manages a system of automatic processes known as reflexes.

Spinal Cord

Based on the scenario below, identify the major division of the nervous system primarily responsible for integrating the sensory information, making the decision, and initiating the complex motor response. Explain your reasoning.

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