What is the choroid plexus?

The choroid plexus is a structure in the brain responsible for the production and circulation of cerebrospinal fluid (CSF).

What are the main components of the choroid plexus?

The choroid plexus consists of highly vascularized connective tissue of the pia mater and a covering of choroid epithelium.

What is the primary function of the choroid plexus?

The primary function of the choroid plexus is the synthesis of cerebrospinal fluid.

How does cerebrospinal fluid circulate in the brain?

CSF travels from the lateral ventricles through the interventricular foramen to the third ventricle, then through the cerebral aqueduct to the fourth ventricle, and into the subarachnoid space.

What is the blood-cerebrospinal fluid barrier?

The blood-cerebrospinal fluid barrier is formed by the choroid epithelium and helps maintain ionic homeostasis by controlling the movement of substances between blood and CSF.

What role does CSF play in brain protection?

CSF cushions the brain and provides shock absorption during head trauma.

How does CSF help in waste removal from the brain?

CSF acts as a conduit for the removal of waste products from the brain since it does not contain lymphatic vessels.

Where can I find more resources on anatomy?

You can find more videos, quizzes, articles, and an atlas of human anatomy on Kenhub.

Choroid plexus (Plexus Choroideus) - Human Anatomy | Kenhub

00:05:14

https://www.youtube.com/watch?v=jSta0wtQmho

Résumé

TLDRIn this tutorial, Nicole from Kenhub discusses the choroid plexus, a crucial structure in the brain's ventricular system responsible for producing and circulating cerebrospinal fluid (CSF). The choroid plexus consists of vascularized connective tissue and choroid epithelium, forming a blood-CSF barrier that maintains the brain's internal environment. The video explains the synthesis of CSF, its circulation through the ventricles, and its protective functions, including cushioning the brain and removing waste. The choroid plexus plays a vital role in maintaining homeostasis in the central nervous system, especially during development. Viewers are encouraged to explore more educational resources on Kenhub.

A retenir

🧠 The choroid plexus is essential for CSF production.
💧 CSF circulates through the brain's ventricles.
🔄 The choroid plexus forms a blood-CSF barrier.
🛡️ CSF cushions the brain and absorbs shocks.
♻️ CSF helps remove waste from the brain.
🌐 Kenhub offers more anatomy resources.

Chronologie

00:00:00 - 00:05:14
Nicole introduces the tutorial on the choroid plexus, starting with a midsagittal section of the brain. Key structures such as the cerebral cortex, corpus callosum, fornix, thalamus, and interthalamic adhesion are identified, all of which are part of the forebrain and midbrain surrounding the choroid plexus. The choroid plexus is described as part of the ventricular system responsible for producing and circulating cerebrospinal fluid (CSF). It consists of vascularized connective tissue of the pia mater and a covering of choroid epithelium, forming a blood-cerebrospinal fluid barrier that regulates the brain's internal environment. The primary function of the choroid plexus is the synthesis of CSF, primarily occurring in the lateral ventricles.

Carte mentale

Vidéo Q&R

What is the choroid plexus?
The choroid plexus is a structure in the brain responsible for the production and circulation of cerebrospinal fluid (CSF).
What are the main components of the choroid plexus?
The choroid plexus consists of highly vascularized connective tissue of the pia mater and a covering of choroid epithelium.
What is the primary function of the choroid plexus?
The primary function of the choroid plexus is the synthesis of cerebrospinal fluid.
How does cerebrospinal fluid circulate in the brain?
CSF travels from the lateral ventricles through the interventricular foramen to the third ventricle, then through the cerebral aqueduct to the fourth ventricle, and into the subarachnoid space.
What is the blood-cerebrospinal fluid barrier?
The blood-cerebrospinal fluid barrier is formed by the choroid epithelium and helps maintain ionic homeostasis by controlling the movement of substances between blood and CSF.
What role does CSF play in brain protection?
CSF cushions the brain and provides shock absorption during head trauma.
How does CSF help in waste removal from the brain?
CSF acts as a conduit for the removal of waste products from the brain since it does not contain lymphatic vessels.
Where can I find more resources on anatomy?
You can find more videos, quizzes, articles, and an atlas of human anatomy on Kenhub.

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Sous-titres

Défilement automatique:

00:00:00
Hey everyone!
00:00:01
It's Nicole from Kenhub again, and in this tutorial, we're going to be talking about
00:00:05
the choroid plexus.
00:00:08
So we're going to begin this tutorial on the choroid plexus with our midsagittal section
00:00:14
of the brain.
00:00:16
And just to point out a few structures before we start, here in the forebrain, we have,
00:00:21
of course, our cerebral cortex with its sulci; we have our corpus callosum here, our fornix
00:00:28
here, and our thalamus and interthalamic adhesion just here.
00:00:35
And those are all, of course, part of the forebrain and the midbrain which surrounds
00:00:39
the choroid plexus.
00:00:41
So, the choroid plexus is part of the ventricular system of the brain which is the system responsible
00:00:48
for the production and circulation of cerebrospinal fluid or CSF.
00:00:54
And the choroid plexus is a richly innervated invagination of pia mater into the four ventricles
00:01:00
of the brain and these are the paired lateral ventricles, the third ventricle, and the fourth
00:01:08
ventricle shown down here in the cerebellum.
00:01:12
And as we return to our image of the choroid plexus, it's important to note that the choroid
00:01:18
plexus consists of two components – the highly vascularized connective tissue of the
00:01:23
pia mater and a covering or plexus of choroid epithelium.
00:01:29
And this simple cuboidal epithelial covering is continuous with the ependyma – the glial
00:01:35
cell membranous lining of the ventricles – who forms a blood-cerebrospinal fluid barrier
00:01:40
which helps to control the brain's internal environment.
00:01:44
And the primary function of the choroid plexus is synthesis of cerebrospinal fluid.
00:01:50
And note that this image shows the choroid plexus of the third ventricle which is highlighted
00:01:55
here in green and the choroid plexus of the fourth ventricle is in this area down here
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below.
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And in this image, we can see the choroid plexus of the lateral ventricle in green.
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So, the choroid plexus is the site of continuous synthesis of cerebrospinal fluid in all four
00:02:16
ventricles though it occurs primarily in the choroid plexus of the lateral ventricles.
00:02:22
And the fluid is formed by a process involving diffusion and active transfer from the arterial
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blood supply of the pia mater which is then transferred from the vascular system of the
00:02:34
choroid plexus through the choroid epithelium and into the ventricles.
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And we're going to have a little bit of a chat about the circulation and function of
00:02:43
the cerebrospinal fluid over the next few slides.
00:02:47
So, once the cerebrospinal fluid is secreted into the lateral ventricle, the cerebrospinal
00:02:55
fluid travels through the interventricular foramen – which just popped up in your screen
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in green for those of you who didn't see it – and through the interventricular foramen
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it travels into the third ventricle and then through the cerebral aqueduct into the fourth
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ventricle.
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And it leaves the ventricular system and enters the subarachnoid space through the three apertures
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of the fourth ventricle which we can see here – so two lateral apertures on both sides
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here and a single median aperture.
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And cerebrospinal fluid flows superiorly within the subarachnoid space and eventually passes
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into the dural venous sinuses for reabsorption into the venous system by the arachnoid villi.
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And the choroid plexus-synthesized cerebrospinal fluid contains water and other plasma components,
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amino acids and glucose which nourishes brain tissue.
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It's presence in the subarachnoid space cushions the brain and provides shock absorbance in
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instances of mild to severe head trauma.
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Additionally, since the brain does not contain lymphatic vessels, cerebrospinal fluid acts
00:04:04
as a conduit for the removal of waste products from the brain.
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In addition to synthesizing cerebrospinal fluid, the choroid plexus forms a blood-cerebrospinal
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fluid barrier which helps to maintain homeostasis of the internal environment of the brain and
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the central nervous system in general especially during development.
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The blood-cerebrospinal fluid barrier which is composed of the choroid epithelium of the
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choroid plexus separates the blood flow around the brain from the cerebrospinal fluid.
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And this barrier is said to maintain ionic homeostasis because it controls the movement
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of small ions and other substances from the blood side of the barrier to the cerebrospinal
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fluid side.
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This video is more fun than reading a textbook, right?
00:04:54
If you want more videos, interactive quizzes, articles, and an atlas of human anatomy, click
00:05:01
on the “Take me to Kenhub” button.
00:05:03
It's time to say goodbye to your old textbooks and hello to your new anatomy learning partner,
00:05:10
Kenhub!
00:05:11
See you there!
00:05:12
https://www.kenhub.com