Third Ventricle Structure
The third ventricle is bordered anteriorly by the lamina terminalis. Its inferior border is the ventral diencephalon (VDC). Its lateral border is made up of the hypothalamus and other VDC structures (ventrally) and the thalamus (dorsally).
Also Know, where is the brain’s third ventricle? The third ventricle is one of four connected fluid-filled cavities comprising the ventricular system within the mammalian brain. It is a median cleft in the diencephalon between the two thalami, and is filled with cerebrospinal fluid (CSF). It is in the midline, between the left and right lateral ventricles.
One may also ask, does the thalamus enclose the third ventricle?
Two ventricles enclosed in the cerebral hemispheres are called the lateral ventricles (first and second). They each communicate with the third ventricle through a separate opening called the Foramen of Munro. The third ventricle is in the center of the brain, and its walls are made up of the thalamus and hypothalamus.
What does the third ventricle control?
Third ventricle. As with the other ventricles of the brain, it is filled with cerebrospinal fluid, which helps to protect the brain from injury and transport nutrients and waste. The third ventricle is a narrow cavity that is located between the two halves of the brain.
What is the largest ventricle in the brain?
Lateral ventricles. The largest cavities of the ventricular system are the lateral ventricles.
Where is the 4th ventricle in the brain?
The fourth ventricle extends from the cerebral aqueduct (aqueduct of Sylvius) to the obex, and is filled with cerebrospinal fluid (CSF). The fourth ventricle has a characteristic diamond shape in cross-sections of the human brain. It is located within the pons or in the upper part of the medulla oblongata.
What are brain ventricles responsible for?
The Ventricles of the Brain. The ventricular system is a set of communicating cavities within the brain. These structures are responsible for the production, transport and removal of cerebrospinal fluid, which bathes the central nervous system.
What causes water on the brain?
Hydrocephalus, also called water in the brain, is a condition where there is an abnormal build up of CSF (cerebrospinal fluid) in the cavities (ventricles) of the brain. The build-up is often caused by an obstruction that prevents proper fluid drainage.
Is the third ventricle a midbrain structure?
The third ventricle is a narrow, funnel-shaped structure that lies in the center of the brain. It lies below the corpus callosum and body of the lateral ventricles, between the two thalami and walls of hypothalamus, and above the pituitary and midbrain (Fig. 28-1).
Where is CSF made?
CSF is produced mainly by a structure called the choroid plexus in the lateral, third and fourth ventricles. CSF flows from the lateral ventricle to the third ventricle through the interventricular foramen (also called the foramen of Monro).
What connects the third and fourth ventricles?
Cerebral Aqueduct. The cerebral aqueduct connects the third ventricle to the fourth. Within the lateral ventricles, choroid plexus is found in the body, atrium, temporal horn and interventricular foramen. Notice that the cerebral aqueduct is located immediately anterior to the midbrain tectum.
How many ventricles are there in the human body?
What forms the floor of the fourth ventricle?
The floor of the fourth ventricle, also known as rhomboid fossa, is formed by the dorsal surfaces of the pons and medulla oblongata. The cerebral aqueduct is a narrow canal in the midline connecting the third and fourth ventricle.
What does the thalamus do?
The thalamus relays sensory impulses from receptors in various parts of the body to the cerebral cortex. A sensory impulse travels from the body surface towards the thalamus, which receives it as a sensation. This sensation is then passed onto the cerebral cortex for interpretation as touch, pain or temperature.
What forms the cerebrospinal fluid?
The cerebrospinal fluid (CSF) is produced from arterial blood by the choroid plexuses of the lateral and fourth ventricles by a combined process of diffusion, pinocytosis and active transfer. A small amount is also produced by ependymal cells.
What does the fourth ventricle do?
The main function of this ventricle is to protect the human brain from trauma (via a cushioning effect) and to help form the central canal, which runs the length of the spinal cord. This ventricle has a roof and a floor.
Which ventricle is located between the two halves of the thalamus?
A thin vertical space filled with CSF called the 3rd ventricle is positioned midline between the two halves of the thalamus.
Which structure of the brain lies on either side of the 3rd ventricle?
The thalamus lies just above the hypothalamic sulcus on the medial surface of the cerebrum. The thalami form a major part of the lateral walls of the third ventricle, and both thalami connect to form the roof of the third ventricle via a band of gray matter known as the interthalamic connexus.