What is the function of Sylvian aqueduct?
The cerebral aqueduct (aqueductus mesencephali, mesencephalic duct, sylvian aqueduct or aqueduct of Sylvius) is a conduit for cerebrospinal fluid (CSF) that connects the third ventricle to the fourth ventricle of the ventricular system of the brain.
What structure is superior to the 4th ventricle?
Fourth ventricle
Definition | The fourth ventricle is the most inferiorly located ventricle, draining directly into the central canal of the spinal cord. |
---|---|
Walls | Lateral walls – formed by cerebellar peduncles Roof – formed by cerebellar peduncles, superior and inferior medullary velum Floor – formed by rhomboid fossa |
What forms the walls of the fourth ventricle?
superior cerebellar peduncle
The lateral wall of fourth ventricle on the upper side is formed by superior cerebellar peduncle and lower part is formed by inferior cerebellar peduncle and gracile and cuneate tubercle. The roof is tent in shape and projected into cerebellum (Fig. 1.13).
How is the heart arranged?
The heart consists of four chambers organized into two pumps (right and left) to provide blood flow to the systemic and pulmonary circulations. The right atrium receives deoxygenated blood from the entire body except for the lungs (the systemic circulation) via the superior and inferior vena cavae.
What forms the roof of the fourth ventricle?
superior cerebellar peduncles
The superior cerebellar peduncles and the anterior and posterior medullary vela form the roof of the fourth ventricle. The apex or fastigium is the extension of the ventricle up into the cerebellum.
What is heart structure?
Your heart is divided into four chambers. You have two chambers on the top (atrium, plural atria) and two on the bottom (ventricles), one on each side of the heart. Right atrium: Two large veins deliver oxygen-poor blood to your right atrium. The superior vena cava carries blood from your upper body.
Are there two foramen of Luschka?
The lateral apertures (of Luschka) (also known as the foramina of Luschka) are two of the foramina in the ventricular system and link the fourth ventricle to the cerebellopontine cistern.
What does lateral foramen Luschka communicate?
The lateral ventricles communicate with the third ventricle through the interventricular foramen (foramen of Monro); the third and fourth ventricles communicate through the cerebral aqueduct and the fourth ventricle communicates with the spinal fluid in the arachnoid space through two lateral apertures (foramen of …
Is cerebral aqueduct and ITER same?
Iter is the passage between the third and fourth ventricles in the brain, the cerebral aqueduct or aqueduct of Sylvius. So, the correct answer is option B.
What is stria Medullaris of 4th ventricle?
Winding around the inferior cerebellar peduncle in the lower part of the fourth ventricle, and crossing the area acustica and the medial eminence are a number of white strands, the medullary striae, which form a portion of the cochlear division of the vestibulocochlear nerve and disappear into the median sulcus.: stria …
How many foramen of Luschka are present?
two
The lateral apertures (of Luschka) (also known as the foramina of Luschka) are two of the foramina in the ventricular system and link the fourth ventricle to the cerebellopontine cistern.
What is Magendie and Luschka?
Following numerous studies on CSF pathways, these openings were first discovered in the 19th century by two notable researchers, François Magendie and Hubert von Luschka, who described the median and lateral openings subsequently named after them.
Where is foramen of Luschka and Magendie?
The median aperture (foramen of Magendie) opens on midline into a subarachnoid space inferior to the cerebellum called the cisterna magna and into the quadrigeminal cistern in the region of the tectum of the midbrain. Two lateral apertures (foramen of Luschka) also open into the cisterna magna.
What is ITER or Aqueduct sylvius?
The Sylvius Aqueduct connects the third and the fourth ventricle and is often known as Iter. The third ventricle is in the centre of the diencephalon and the fourth ventricle is in the centre of the pons and the cerebellum.
What is the structure of the 3rd ventricle?
Third Ventricle Structure. The third ventricle can be described as having six components: a roof, a floor, and four walls. The roof of the third ventricle is formed by a part of the choroid plexus known as the tela chorioidea. The tela chorioidea is a dense network of capillaries that is surrounded by ependymal cells.
What is the roof of the ventricle composed of?
The roof of the ventricle comprises choroid plexus, forming the inferior central portion of the tela choroidea; immediately above the superior central portion of the tela choroidea is the fornix .
What is the structure of the cerebral ventricles?
The cerebral ventricles consist of the lateral ventricles, third ventricle, and fourth ventricle. The ventricles contain cerebrospinal fluid, which is produced by specialized epithelium located within the ventricles called the choroid plexus.
What are the 5 divisions of the ventricles?
These five divisions are the anterior (frontal) horn, body, atrium (trigone), temporal horn, and occipital horn. For a more detailed description of the lateral ventricular segments, see the discussion in the Principles of Intraventricular Surgery chapter.