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Related Concept Videos

Brainstem01:19

Brainstem

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
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Brainstem: Control Centers of Medulla01:21

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The medulla oblongata is a crucial part of the brainstem responsible for controlling various autonomic and involuntary functions. It contains several nuclei, including the olivary, cuneate, gracile, and solitary nuclei.
Olivary Nucleus
The olivary nucleus, or inferior olivary nucleus, is located within the ventrolateral part of the medulla oblongata. It is primarily involved in motor coordination and motor learning. The olivary nucleus receives input from the spinal cord, cerebellum, and motor...
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Cerebellum: Anatomical Regions01:17

Cerebellum: Anatomical Regions

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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
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Anatomy of the Brain: Ventricles01:18

Anatomy of the Brain: Ventricles

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There are hollow fluid-filled cavities known as ventricles deep inside the human brain. There are two lateral ventricles, one in each cerebral hemisphere, and each has three different projections — the anterior, inferior, and posterior horns visible from the lateral side. A thin membrane called the septum pellucidum separates the two lateral ventricles. The slender third ventricle in the diencephalon is connected to each lateral ventricle via a channel called the interventricular foramen.
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Organization of the Brain01:30

Organization of the Brain

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The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
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Functional Brain Systems: Reticular Formation01:13

Functional Brain Systems: Reticular Formation

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The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
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Updated: Mar 29, 2026

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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Structural and functional anatomy of the brainstem.

Helmut Heinsen1, Lea Tenenholz Grinberg2, Simone Bohnert1

  • 1Institute of Forensic Medicine, University of Würzburg, Würzburg, Germany.

Handbook of Clinical Neurology
|March 27, 2026
PubMed
Summary

The brainstem, crucial for vital functions and consciousness, has a conserved structure. Human evolution increased forebrain size, but brainstem expansion was limited, making it vulnerable to disease.

Keywords:
AtlasBrainstemChemoarchitectureCytoarchitectureEvolutionHumanMyeloarchitectureReticular formation

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • The brainstem, connecting the forebrain and spinal cord, comprises the medulla oblongata, metencephalon, and mesencephalon.
  • Its tegmentum contains cranial nerve nuclei (III-XII) and the reticular formation, vital for arousal and consciousness.
  • Aminergic and cholinergic nuclei in the brainstem significantly influence mood, motivation, and cognition.

Purpose of the Study:

  • To describe the brainstem's structure and function.
  • To explore the impact of human telencephalic evolution on brainstem anatomy.
  • To understand the brainstem's vulnerability to disease due to evolutionary constraints.

Main Methods:

  • Descriptive anatomical review.
  • Comparative analysis of brainstem structures across species (implied).
  • Correlation of evolutionary changes with functional implications.

Main Results:

  • The brainstem's conserved tegmentum houses critical motor/sensory nuclei and the reticular formation.
  • Brainstem architecture supports information convergence/divergence, essential for vital functions.
  • Human evolution led to significant forebrain expansion but limited brainstem proportional growth.

Conclusions:

  • The brainstem's conserved structure is vital for life and cognitive functions.
  • Limited brainstem expansion during human evolution increases its susceptibility to neurological disorders.
  • Understanding brainstem anatomy and evolution is key to addressing related diseases.