BackAnatomy & Physiology Study Notes: The Brain (Chapter 14, NS1500)
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The Brain
Introduction and Directional Terms
The brain is the central organ of the nervous system, responsible for processing sensory information, coordinating movement, and regulating vital functions. Understanding its structure requires knowledge of anatomical directional terms:
Rostral: Toward the forehead (anterior)
Caudal: Toward the spinal cord (posterior)
Major Landmarks of the Brain
The brain is divided into several major regions and features that are essential for its function and organization.
Cerebral Hemispheres: The largest part of the brain, responsible for higher cognitive functions.
Longitudinal Fissure: A deep groove that separates the left and right cerebral hemispheres.
Gyri: Thick folds on the brain surface that increase surface area for neural processing.
Sulci: Grooves between gyri that further increase the brain's surface area.
Major Regions of the Brain
The brain consists of several distinct regions, each with specialized functions:
Cerebellum: The second largest brain region, located in the posterior cranial fossa. It contains about 50% of the brain's neurons but only 10% of its volume. The cerebellum is crucial for motor coordination and balance.
Brainstem: The stalk-like portion connecting the brain to the spinal cord. It includes the midbrain, pons, and medulla oblongata, which are involved in basic life functions such as breathing, heart rate, and sleep.
Visual Representation
Diagrams of the brain show the location of major landmarks and regions, including the frontal, parietal, occipital, and temporal lobes, as well as the cerebellum and brainstem. These images help in understanding the spatial relationships and functional divisions within the brain.
Summary Table: Major Brain Regions and Functions
Region | Location | Main Functions |
|---|---|---|
Cerebrum | Superior, largest part | Sensory perception, cognition, voluntary movement |
Cerebellum | Posterior cranial fossa | Motor coordination, balance |
Brainstem | Inferior, connects to spinal cord | Autonomic functions (breathing, heart rate), sleep |
Additional info:
The cerebrum is divided into lobes named after the cranial bones overlying them: frontal, parietal, occipital, and temporal.
The brainstem is essential for survival, as it controls many involuntary processes.
