Ventricles of the Brain
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Questions and Answers

The choroid plexus in the lateral ventricle extends into the anterior horn.

False (B)

The lateral ventricles are always symmetrical in all parts.

False (B)

The choroid fissure is regarded as the medial wall of the body and inferior horn of the ventricle.

True (A)

The posterior horn of the lateral ventricle is the least variably developed part.

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

The corpus callosum forms the roof of the lateral ventricle.

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

The lateral ventricle entirely lies within the white matter of the hemisphere.

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

The stria medullaris is a band of white matter running the entire length of the caudate nucleus.

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

The fornix in the lateral ventricle acts as a roof structure.

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

The forceps minor forms the lateral boundary of the anterior horn of the lateral ventricle.

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

The lateral ventricle's body and inferior horn have their medial wall formed by the thalamostriate vein.

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

The central nervous system is solid and does not develop from a neural tube.

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

Cerebrospinal fluid is produced by the choroid plexus within the ventricles.

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

Each cerebral hemisphere has a lateral ventricle that is fully encapsulated by grey matter.

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

The cerebral aqueduct connects the fourth ventricle to the third ventricle.

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

The interventricular foramen allows the lateral ventricles to communicate with the third ventricle.

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

The pons and medulla share a cavity known as the fourth ventricle.

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

There are multiple lateral ventricles associated with each cerebral hemisphere.

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

The central canal extends from the fourth ventricle through the spinal cord.

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

The choroid plexuses of the lateral ventricles contribute the majority of cerebrospinal fluid production.

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

The openings in the ventricular system through which cerebrospinal fluid escapes are located in the roof of the third ventricle.

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

The floor of the lateral ventricle is formed medially by the hippocampus and laterally by the collateral eminence.

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

The choroid fissure is located in the superior horn of the lateral ventricle.

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

The tail of the caudate nucleus ends in the amygdaloid body adjacent to the anterior perforated substance.

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

The internal capsule runs through the convexity of the lateral ventricle.

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

The collateral trigone is located where the posterior and anterior horns of the lateral ventricle diverge.

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

The fornix contributes to the formation of the roof of the body of the lateral ventricle.

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

The caudate nucleus is found within the concavity of the C-shaped lateral ventricle.

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

The corona radiata is located in the inferior horn of the lateral ventricle.

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

The fimbria and the continuation of the fornix form lips of the choroid fissure.

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

The bulbous head of the caudate nucleus lies in the lateral horn of the lateral ventricle.

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

Flashcards

Ventricles of the brain

Hollow cavities in the brain that produce cerebrospinal fluid.

Cerebrospinal fluid

Fluid produced in the brain ventricles, cushioning the brain and spinal cord.

Choroid plexus

A structure made of blood vessels that produces cerebrospinal fluid in the ventricles.

Ependyma

Thin layer of cells lining the brain's ventricular system that helps in producing CSF.

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Lateral ventricles

The two largest cavities in each cerebral hemisphere that produce most CSF.

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Interventricular foramen

A small passage that connects the lateral ventricles to the third ventricle.

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Third ventricle

A narrow cavity located between the two halves of the brain, receiving CSF from the lateral ventricles.

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Fourth ventricle

Cavity located in the pons and medulla that connects with the third ventricle.

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Aqueduct

A narrow channel connecting the third and fourth ventricles for CSF flow.

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Subarachnoid space

Space around the brain and spinal cord where cerebrospinal fluid is distributed.

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Hippocampus

Part of the brain involved in memory and spatial navigation, forming the medial floor of the lateral ventricle.

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Collateral Eminence

An area that expands posteriorly to form the collateral trigone, situated laterally to the hippocampus.

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Collateral Trigone

The region where the posterior and inferior horns of the lateral ventricle diverge.

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Caudate Nucleus

C-shaped structure with a bulbous head in the anterior horn and a thinner body, part of the basal ganglia.

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Amygdaloid Body

A cluster of nuclei involved in emotion, located at the tail of the caudate nucleus.

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Internal Capsule

A white matter structure that contains corticospinal and corticonuclear fibers, running between the thalamus and striatum.

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Inferior Horn

The lower part of the lateral ventricle that is involved in the C-shaped structure of the brain.

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Fornix

A C-shaped bundle of fibers that connects the hippocampus to other brain regions; it's the upper lip of the choroid fissure.

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Pes Hippocampi

The rounded end of the hippocampus that is located at the tip of the inferior horn of the lateral ventricle.

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CT and MR scanning

Modern imaging techniques that provide detailed images of structures inside the body, replacing older methods.

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Choroid fissure

Medial wall of the lateral ventricle where the choroid plexus invaginates.

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Thalamus

A central brain structure that serves as a relay station for sensory and motor signals.

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Corpus callosum

The bundle of nerve fibers connecting the left and right cerebral hemispheres.

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Inferior horn of lateral ventricle

The extension of the lateral ventricle that projects into the temporal lobe.

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Posterior horn of lateral ventricle

The back extension of the lateral ventricle, variable in development.

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Study Notes

Ventricles of the Brain

  • The central nervous system's hollow cavity, the neural tube, persists during brain development.
  • This cavity is lined with ependyma, a single epithelial cell layer.
  • Cerebrospinal fluid (CSF) is produced within these cavities called ventricles.
  • Ventricular lining ependyma contacts the pia mater, allowing blood capillary invagination.
  • This combination (capillaries, pia, and ependyma) forms the choroid plexus, which secretes CSF.
  • The choroid plexus lines the entire ventricular surface.

Lateral Ventricles

  • Each cerebral hemisphere contains a lateral ventricle.
  • The lateral ventricle opens to the surface through a curved slit called the choroid fissure.
  • The choroid plexus of the lateral ventricle is invaginated within the choroid fissure.
  • Lateral ventricles are large and highly vascular, producing most of the CSF.

Third Ventricle

  • The diencephalon has a cavity called the third ventricle.
  • Two choroid plexuses of the third ventricle are invaginated on its roof.
  • The third ventricle connects with the lateral ventricles via the interventricular foramen.

Fourth Ventricle

  • The pons and medulla have a shared cavity, the fourth ventricle.
  • The fourth ventricle's roof is invaginated by right and left choroid plexuses.
  • The fourth ventricle's choroid plexus contributes less CSF than those in the lateral and third ventricles.
  • CSF exits the ventricular system through apertures in the roof of the fourth ventricle.

Ventricular Imaging

  • Modern imaging (CT, MRI) replaces older ventriculography methods.
  • Older methods involved removing CSF and replacing with air for radiographic visualization.
  • Lateral ventricles often exhibit asymmetry, especially posteriorly; midline ventricles (third/aqueduct/fourth) are typically symmetrical.
  • Skull asymmetry correlates with cerebral and ventricular asymmetry.

Lateral Ventricle Anatomy

  • The lateral ventricle is C-shaped within the cerebral hemisphere.
  • The ventricle is not completely contained within the hemisphere's white matter; it lies against the pia mater medially.
  • The choroid plexus is invaginated within the choroid fissure, which is a slit on the medial hemisphere surface.
  • Some sulci (e.g., parahippocampal, calcarine, collateral) indent the ventricle's cavity.

Lateral Ventricle Horns

  • The lateral ventricle has a body, anterior, posterior, and inferior horns.
  • The anterior horn extends forward; posterior and inferior horns project backward and downward, respectively.
  • The posterior horn is variable in development and can be absent.
  • The inferior horn is the largest, containing the hippocampus and collateral eminence.

Ventricle Interconnections

  • The interventricular foramen (of Monro) joins the lateral ventricle with the third ventricle.
  • Choroid plexus extends through the interventricular foramen to reach the third ventricle from the lateral ventricle body.

Ventricle Structures

  • Structures near the ventricular convexity are found on the roof of the body and floor of the inferior horn
  • Structures near the ventricular concavity are found on the floor of the body and the roof of the inferior horn
  •  Sections through C-Shaped structures must cut them twice.
  • The caudate nucleus and internal capsule are located within the lateral ventricles' concavity.

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Description

Explore the structure and function of the brain's ventricles, including the lateral and third ventricles. This quiz covers the formation of cerebrospinal fluid (CSF) and the role of the choroid plexus. Test your knowledge on the anatomy of the central nervous system and its key features.

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