What forms the floor of the 3rd ventricle?
The floor of the third ventricle is formed by the infundibulum, which attaches the hypophysis, the tuber cinereum, the mammillary bodies, and the upper end of the midbrain. The posterior wall is formed by the pineal gland and habenular commissure.
What forms the roof of the 3rd ventricle?
tela choroidea
The superior and inferior layers of the tela choroidea form a space called the velum interpositum, which contains the third, and vascular, layer of the roof of the third ventricle.
Which structure is occluded at the level of third ventricle?
The cerebral aqueduct is a narrow channel, 1 to 3 mm in diameter, that connects the third ventricle (the cavity of the diencephalon) with the fourth ventricle (the rhombencephalic cavity).
What structure makes up the floor of the fourth ventricle?
This ventricle has a roof and a floor. The roof is composed of the cerebellum, located at the back of the brain, and the floor is formed by the rhomboid fossa, a depression in the brainstem. Within the floor is the facial colliculus, sulcus limitans, and the obex.
Is the third ventricle in the forebrain?
The third ventricle is a narrow funnel-shaped cavity of the brain that is located in the midline between the two hemispheres of the diencephalon of the forebrain. The third ventricle makes up the central part of the brain and facilitates communication between other ventricles.
Is the third ventricle a midbrain structure?
The floor of the third ventricle extends from the optic chiasm anteriorly to the aqueduct of Sylvius posteriorly. The anterior portion of the floor is formed by the hypothalamus, while the posterior portion is formed by the midbrain (mesencephalon).
Is the third ventricle located in the forebrain?
What is the name of the structure at the floor of the third ventricle which has major roles in homeostasis?
Answer and Explanation: The correct answer is B. Hypothalamus. Hypothalamus is the part of the human brain located in the central region.
What makes up the floor of the diencephalon?
The floor is made up of the optic chiasm, the tuber cinereum and infundibulum, the mammillary bodies, the posterior perforated substance and the uppermost part of the mesencephalic tegmentum. The anterior wall is the delicate lamina terminalis, as well as the anterior commissure and anterior column of the fornix..
What part of the brain is found in the walls of the third ventricle?
The hypothalamus and thalamus are located on the sides of the third ventricle.
Which nuclei are found in floor of 4th ventricle?
The hypoglossal nucleus bulges into the floor, creating the hypoglossal trigone, located slightly superiorly to the inferior fovea, within the median eminance.
What is the structure of the third ventricle?
Like other ventricles, the third ventricle has a cavity, an anterior wall, a posterior wall, a floor, a roof and two lateral walls. The floor is formed by the optic chiasma, the tuber cinereum and the infundibulum, the mamillary bodies, the posterior perforated substance and the tegmentum of the midbrain.
What is the floor of the ventricles made of?
The floor is formed by the optic chiasma, the tuber cinereum and the infundibulum, the mamillary bodies, the posterior perforated substance and the tegmentum of the midbrain. The roof is constituted by ependyma that stretches across the two thalami and lines the ventricular surface.
Is the third ventricle part of the thalamus?
The third ventricle is an important clinical landmark. Once it is located, the structures on either side are parts of the thalamus. Anteriorly, the third ventricle ends at the lamina terminalis, which was formed from the rostral neuropore.
What type of tissue covers the roof of the third ventricle?
However, the fornices and hippocampal commissure in the roof of the third ventricle are covered by a loose trabecular pial tissue that forms a double layer called the tela choroidea.