Lateral Ventricles in Brain Anatomy

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Questions and Answers

The lateral ventricles are primarily located in the temporal lobe of the brain.

False (B)

The interventricular foramina connect the lateral ventricles to the fourth ventricle.

False (B)

The anterior horn of the lateral ventricle extends into the occipital lobe.

False (B)

The body of the lateral ventricle is located in the parietal and frontal lobes.

<p>True (A)</p> Signup and view all the answers

The trigone of the lateral ventricle is the junction between the anterior horn and the inferior horn.

<p>False (B)</p> Signup and view all the answers

Each lateral ventricle contains cerebrospinal fluid, which is essential for cushioning the brain.

<p>True (A)</p> Signup and view all the answers

There are three lateral ventricles, one in each cerebral hemisphere and one in the cerebellum.

<p>False (B)</p> Signup and view all the answers

The anterior horn of the lateral ventricle is situated directly below the genu of the corpus callosum.

<p>False (B)</p> Signup and view all the answers

The septum pellucidum forms the medial boundary of the anterior horn of the lateral ventricle, separating it from the ipsilateral anterior horn.

<p>False (B)</p> Signup and view all the answers

A cyst located on the anterior horn of the lateral ventricle is always considered an abnormal finding.

<p>False (B)</p> Signup and view all the answers

The body of the lateral ventricle is located between the anterior horn and the trigone, extending between the frontal lobe and the parietal lobe.

<p>True (A)</p> Signup and view all the answers

The lateral edge of the body of the lateral ventricle is entirely formed by the tail of the caudate nucleus.

<p>False (B)</p> Signup and view all the answers

The septum pellucidum forms the roof of the body of the lateral ventricle, separating it from the corresponding structure of the opposite ventricle.

<p>False (B)</p> Signup and view all the answers

The anterior horn of the lateral ventricle is connected to the third ventricle through the interventricular foramen, which is situated in the body of the ventricle.

<p>False (B)</p> Signup and view all the answers

The lateral ventricle is a single, closed cavity within the brain that is not connected to any other cerebrospinal fluid-filled spaces.

<p>False (B)</p> Signup and view all the answers

The inferior portion of the anterior horn of the lateral ventricle is bordered by the rostrum of the corpus callosum.

<p>True (A)</p> Signup and view all the answers

The genu of the corpus callosum forms the roof of the body of the lateral ventricle.

<p>False (B)</p> Signup and view all the answers

The inferior horn of the lateral ventricle is also known as the temporal horn.

<p>True (A)</p> Signup and view all the answers

The inferior horn of the lateral ventricle terminates at the hippocampus.

<p>False (B)</p> Signup and view all the answers

The lateral ventricles develop from the central canal of the neural tube.

<p>True (A)</p> Signup and view all the answers

The roof of the inferior horn is formed solely by the caudate nucleus.

<p>False (B)</p> Signup and view all the answers

The choroid plexus is located along the medial wall of the inferior horn.

<p>True (A)</p> Signup and view all the answers

The lateral ventricles have a cylindrical cross-section.

<p>False (B)</p> Signup and view all the answers

Ependyma is a type of neuroepithelial cell that lines the ventricular system.

<p>True (A)</p> Signup and view all the answers

The putamen is located below the lateral ventricles.

<p>False (B)</p> Signup and view all the answers

The thalamus constitutes the main structure bounding the lateral ventricles.

<p>False (B)</p> Signup and view all the answers

The anterior horn of the lateral ventricle is also referred to as the occipital horn.

<p>False (B)</p> Signup and view all the answers

The globus pallidus is situated above the putamen.

<p>False (B)</p> Signup and view all the answers

The anterior extremities of the fornix communicate primarily with the thalamus.

<p>True (A)</p> Signup and view all the answers

The choroid plexus creates a cleft-like opening between the lateral ventricle and the thalamus.

<p>True (A)</p> Signup and view all the answers

The occipital tapetum provides connections between the putamen and the caudate nucleus tail.

<p>True (A)</p> Signup and view all the answers

The stria terminalis is located immediately above the caudate nucleus.

<p>False (B)</p> Signup and view all the answers

The fornix of the brain forms a narrow portion of the lateral boundary of the lateral ventricle.

<p>True (A)</p> Signup and view all the answers

The trigone of the lateral ventricle is also known as the atrium of the lateral ventricle.

<p>True (A)</p> Signup and view all the answers

The posterior horn of the lateral ventricle is associated with the frontal lobe.

<p>False (B)</p> Signup and view all the answers

The choroid plexus enlarges at a specific area within the trigone of the lateral ventricle.

<p>True (A)</p> Signup and view all the answers

The lateral edge of the posterior horn is formed by the tapetum of the corpus callosum.

<p>True (A)</p> Signup and view all the answers

The term 'forceps' refers to the loose bundling seen at the posterior end of the corpus callosum.

<p>False (B)</p> Signup and view all the answers

The collateral trigone is recognized as a triangular surface feature of the lateral ventricle's floor.

<p>True (A)</p> Signup and view all the answers

The white matter of the occipital lobe directly contacts the lateral edge of the posterior horn.

<p>False (B)</p> Signup and view all the answers

The inferior horn forms a junction with the body of the lateral ventricle.

<p>True (A)</p> Signup and view all the answers

Flashcards

Lateral ventricles

The two largest brain ventricles containing cerebrospinal fluid, located in each cerebral hemisphere.

Cerebrospinal fluid

A clear fluid found in the brain's ventricles that cushions and protects the brain and spinal cord.

Ventricular system

The interconnected system of cavities filled with cerebrospinal fluid in the brain.

Interventricular foramen

The small openings connecting each lateral ventricle to the third ventricle.

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Trigone of the lateral ventricle

The junction where the anterior extension meets the main curve of the lateral ventricle.

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Horns of the lateral ventricle

Three extensions of the lateral ventricle, identified as anterior, posterior, and inferior horns.

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Body of the lateral ventricle

The central part of the lateral ventricle, located at the superior curve.

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Inferior horn of the lateral ventricle

The largest horn of the lateral ventricle, extending from the atrium beneath the thalamus to the amygdala.

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Components of inferior horn

The floor is formed by the collateral eminence and hippocampus, separated by the alveus.

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Choroid plexus

The choroid plexus occupies the medial wall of the inferior horn.

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Development of lateral ventricles

Lateral ventricles develop from the central canal of the neural tube in the prosencephalon.

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Fimbria of hippocampus

The fimbria forms the majority of the inferior horn's floor, from which the fornix emerges.

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Ependyma

Neuroepithelial cells that line the ventricular system.

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Putamen

A structure that emerges from the caudate nucleus, located below the lateral ventricle.

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Globus Pallidus

A structure located beneath the putamen, involved in movement regulation.

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Thalamus

A central relay station for sensory information located medial to the lateral ventricles.

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Choroid Fissure

A cleft-like opening between the lateral ventricle and the thalamus.

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Frontal Horn

Also known as the anterior horn, it extends into the frontal lobe.

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Mamillary Bodies

Structures that communicate with the thalamus and are connected to the fornix.

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Anterior horn

The front portion of the lateral ventricle connecting to the third ventricle.

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Septum pellucidum

A thin neural sheet separating the anterior horns of the lateral ventricles.

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Corpus callosum

A thick band of nerve fibers connecting the left and right hemispheres of the brain.

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Rostrum

The reflected portion of the corpus callosum forming the floor of the anterior horn.

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Tapetum of the corpus callosum

The roof of the body of the lateral ventricle, a part of the corpus callosum.

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Trigon

The area where the body of the lateral ventricle narrows into the occipital horn.

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Tail of the caudate nucleus

Forms the upper portion of the lateral edge of the body of the lateral ventricle.

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Frontal horn cysts

Normal variants sometimes found on the frontal horn of the lateral ventricle.

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Stria Terminalis

A narrow structure located below the tail of the caudate nucleus, positioned above the superior thalamostriate vein.

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Superior Thalamostriate Vein

A vein located beneath the stria terminalis, involved in draining blood from brain structures.

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Fornix of the Brain

A C-shaped bundle of nerve fibers in the brain, key in connecting parts of the limbic system.

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Atriun of the Lateral Ventricle

The enlarged area in the lateral ventricle's trigone where the choroid plexus is found.

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Collateral Trigone

The triangular surface feature in the floor of the trigone of the lateral ventricle.

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Posterior Horn of the Lateral Ventricle

Also known as the occipital horn, it extends into the occipital lobe of the brain.

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Forceps of the Corpus Callosum

The tightly bundled ends of the corpus callosum that curve around the central sulci.

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Study Notes

Lateral Ventricles

  • The lateral ventricles are the two largest ventricles in the brain, containing cerebrospinal fluid.
  • Each cerebral hemisphere contains one lateral ventricle (left or right).
  • Each ventricle has a C-shape.
  • It starts at an inferior horn in the temporal lobe.
  • It passes through the body of the parietal and frontal lobes.
  • It terminates at the interventricular foramina, connecting to the third ventricle.
  • A posterior horn extends into the occipital lobe.
  • An anterior horn extends into the frontal lobe.

Ventricle Structure

  • The lateral ventricles are C-shaped cavities.
  • The central part is called the body.
  • Three projections are called horns (anterior, posterior, and inferior).
  • The inferior horn is the largest.
  • The anterior horn is also known as the frontal horn.
  • The posterior horn is also known as the occipital horn.
  • The trigone is where the body joins the inferior and posterior horns. It is also called the atrium.
  • The choroid plexus is a specialized area in the ventricles that produces cerebrospinal fluid.
  • The septum pellucidum separates the ventricles.

Anterior Horn

  • Also called the frontal horn.
  • Connects to the third ventricle via the interventricular foramen.
  • Situated in the frontal lobe.
  • Bordered by the corpus callosum, caudate nucleus, and septum pellucidum.
  • Occasionally has cysts.

Body of the Lateral Ventricle

  • The section between the anterior and trigone of the ventricle.
  • The roof is bordered by the tapetum of the corpus callosum.
  • The septum pellucidum separates it from the other lateral ventricle.
  • The tail of the caudate nucleus bounds part of the lateral edge.
  • The stria terminalis also borders it.
  • The fornix completes the lateral boundary.
  • The choroid plexus is on the medial edge.

Trigone of the Lateral Ventricle

  • This is where the body connects to the inferior and posterior horns.
  • Also called the atrium of the lateral ventricle.
  • Contains an enlarged choroid plexus (choroid glomus).

Posterior Horn

  • Also called the occipital horn.
  • Curves medially and inferiorly into the occipital lobe.
  • Corpus callosum and its tapetum form the roof.
  • The medial edge connects to the white matter of the occipital lobe.

Inferior Horn

  • Also called the temporal horn.
  • Largest of the horns.
  • Extends to the amygdala and hippocampus.
  • Floor formed by collateral eminence and hippocampus.
  • Roof formed by thalamus, caudate nucleus, and tapetum.
  • Stria terminalis forms part of the roof.
  • Choroid plexus is on medial side.

Development

  • Lateral ventricles develop from the central canal of the neural tube.
  • They form during prenatal development.
  • Special structures such as choroid plexuses appear.
  • Pressure from surrounding structures can create bulges/modifications
  • The shape and size of the ventricles can vary.
  • Abnormal enlargement (ventriculomegaly) can indicate neurological problems.
  • Asymmetry (size difference) is mostly normal in 5-12% of population.

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