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Anatomy of the Brain: Ventricles

Anatomy of the Brain: Ventricles

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. The...

Chambers of the Heart

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The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.

Anatomy of the Heart

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The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
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The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.

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Related Experiment Video

Updated: May 26, 2026

Zebrafish Brain Ventricle Injection

Zebrafish Brain Ventricle Injection

Published on: April 6, 2009

What is a ventricle?

Robert H Anderson¹, Timothy J Mohun, Antoon F M Moorman

¹Institute of Medical Genetics, Newcastle University, Newcastle upon Tyne, London, United Kingdom. r.anderson@ich.ucl.ac.uk

Cardiology in the Young

|December 14, 2011

Summary

This summary is machine-generated.

A ventricle is defined by its apical trabecular component, with normal formation requiring inlet, apical trabecular, and outlet parts. Incomplete ventricles, especially those lacking inlet components, can lead to functionally univentricular hearts.

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Area of Science:

Cardiovascular Development
Cardiac Morphology
Congenital Heart Disease

Background:

Accurate definition of cardiac ventricles is crucial for understanding congenital heart anomalies.
Developmental and morphological evidence suggests a need for refined ventricular classification.

Purpose of the Study:

To propose a refined definition of a ventricle based on developmental and morphological criteria.
To elucidate the components of normal and incomplete ventricular formation.
To correlate ventricular morphology with the development of functionally univentricular hearts.

Main Methods:

Analysis of developmental and morphological evidence of ventricular formation.
Classification of ventricles based on the presence of apical trabecular, inlet, and outlet components.
Examination of the relationship between ventricular components and cardiac function.

Main Results:

A ventricle is defined as a chamber with an apical trabecular component, existing as right or left morphology.
Normal ventricles possess inlet, apical trabecular, and outlet components; incomplete ventricles lack one or both.
Lack of the inlet component results in hypoplastic ventricles and can lead to functionally univentricular hearts.

Conclusions:

The proposed definition refines ventricular classification based on essential developmental components.
Understanding ventricular component make-up and size is vital for diagnosing congenital heart disease.
Incomplete ventricular formation, particularly absence of the inlet component, is a key factor in functionally univentricular hearts.