CNS physiology
Read the topic background here, then explore the labeled visual and structured learning explanations on this page.
Read explanation on this page ↓ See diagram ↓Central nervous system — on-site reading
This reference extract addresses Central nervous system, a related subject. It does not cover every part of CNS physiology.. The article introduction is reproduced here, so you do not need to leave MedAtlas to read it. It may not match the latest official medical guidance.
The central nervous system (CNS) is the part of the nervous system consisting primarily of the brain, and the spinal cord. The retina is also technically part of the CNS. The CNS is named so because the brain integrates the received information and coordinates and influences the activity of all parts of the bodies of bilaterally symmetric and triploblastic animals—that is, all multicellular animals except sponges and diploblasts. It is a structure composed of nervous tissue positioned along the rostral (nose end) to caudal (tail end) axis of the body and may have an enlarged section at the rostral end which is a brain. Only arthropods, cephalopods and vertebrates have a true brain, though precursor structures exist in onychophorans, gastropods and lancelets.
The rest of this article exclusively discusses the vertebrate central nervous system, which is radically distinct from all other animals.
How this connects to Physiology
To study this topic responsibly, identify its normal structure or function, distinguish the main mechanism from its observable consequences, and ask which data can test a competing explanation. The subject foundations below outline these connections without pretending to be a specialist textbook chapter.
Text credit: Wikipedia contributors, “Central nervous system”, original article · authors & revision history · CC BY-SA 4.0. Unmodified opening extract, accessed 24 September 2026. This Wikipedia-derived section is provided under CC BY-SA 4.0; the independent MedAtlas notes and design are separate works.
CNS physiology · visual study map
Scalable vector illustration. Labeled conceptual map, not a precise anatomical, histological or diagnostic image.The wording in this learning map is adapted from the attributed Wikipedia background section below (CC BY-SA 4.0).
What the underlying subject studies
Physiology studies how living systems work rather than only what parts look like. Identify the regulated variable or input, the sensor or receptor, the control mechanisms and the resulting response. Connect events at the cell level to what occurs in an entire organ system.
How mechanisms and evidence connect
Most physiological processes are dynamic and interact through neural, hormonal, local and mechanical signals. For quantitative relationships, define what each variable means and the assumptions under which an equation holds before applying it to real data.
How to develop a sound explanation
Use a time-course or feedback diagram to show cause and effect. Compare normal conditions with an altered condition and explain which compensatory responses might occur, without assuming that compensation removes the original disturbance.
References and verification (optional)
All reading material on this page appears above. The links below are for checking the primary syllabus, research or source attribution, not requirements for opening this lesson.
NMC official CBME Curriculum 2024 and current regulations index ↗