Where is superior medullary velum?
Where is superior medullary velum?
Object: The superior medullary velum (SMV) is a thin lamina of white matter located between the superior cerebellar peduncles horizontally and between the midbrain and cerebellum vertically.
What is superior medullary velum?
Anatomical terms of neuroanatomy The superior medullary velum (anterior medullary velum) is a thin, transparent lamina of white matter, which stretches between the superior cerebellar peduncles; on the dorsal surface of its lower half the folia and lingula are prolonged.
At which portion of the pons would you find the superior medullary velum?
The fastigium is the posterior apex of the fourth ventricle, where superior and inferior medullary vela meet, and it should lie below the midpoint of the craniocaudal center of the pons. Fig. 13.3.
What is inferior medullary velum?
Anatomical terms of neuroanatomy The inferior medullary velum (posterior medullary velum) is a thin layer of white substance, prolonged from the white center of the cerebellum, above and on either side of the nodule; it forms the infero-posterior part of the fourth ventricle.
Where do the superior cerebellar peduncles Decussate?
The superior cerebellar peduncles decussate centrally (decussation of Wernekinck) in the ventral midbrain at the level of the inferior colliculi.
How are the superior and inferior medullary velum related to the fourth ventricle?
The superior medullary velum is located on the midline, between both superior cerebellar peduncles. Inferior roof of the fourth ventricle: In contrast to the superior roof, the inferior roof of the fourth ventricle is formed mainly by two thin membranes, the tela choroidea and the inferior medullary velum.
Is a medulla oblongata?
The medulla oblongata or simply medulla is a long stem-like structure which makes up the lower part of the brainstem. It is anterior and partially inferior to the cerebellum….
| Medulla oblongata | |
|---|---|
| Section of the medulla oblongata at about the middle of the olivary body | |
| Details | |
| Part of | Brain stem |
| Identifiers |
Which projection system is contained in the superior cerebellar peduncle?
3. The superior cerebellar peduncle (brachium conjunctivum) consists principally of efferent projections from the cerebellum. Rubral, thalamic, and reticular projections arise from the dentate and interposed nuclei.
How are the superior and inferior medullary vela related to the fourth ventricle?
The superior cerebellar peduncles and the anterior and posterior medullary vela form the roof of the fourth ventricle. 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.
Where is superior cerebellar peduncle?
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The superior peduncle emerges from the upper and medial parts of the white matter of each hemisphere and is placed under cover of the upper part of the cerebellum.
Where is the superior cerebellar artery?
The superior cerebellar artery arises near the end of the basilar artery. It passes laterally around the brainstem. This is immediately below the oculomotor nerve, which separates it from the posterior cerebral artery. It then winds around the cerebral peduncle, close to the trochlear nerve.
Where is the Sylvian aqueduct located?
Anatomical terms of neuroanatomy 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 is the superior medullary velum?
The superior medullary velum ( anterior medullary velum) is a thin, transparent lamina of white matter, which stretches between the superior cerebellar peduncles; on the dorsal surface of its lower half the folia and lingula are prolonged. It forms, together with the superior cerebellar peduncle,…
Where is the superior cerebellar peduncle located?
It forms, together with the superior cerebellar peduncle, the roof of the upper part of the fourth ventricle; it is narrow above, where it passes beneath the facial colliculi, and broader below, where it is continuous with the white substance of the superior vermis .
What nerve innervates the frenulum veli?
A slightly elevated ridge, the frenulum veli, descends upon its upper part from between the inferior colliculi, and on either side of this the trochlear nerve emerges. Blood is supplied by branches from the superior cerebellar artery .
What is the posterior surface of the medulla called?
The posterior surface of the medulla can be divided into an upper open area and a lower closed area. The open area is also known as the floor of the fourth ventricle or rhomboid fossa. It has unique raised areas that mark the location of underlying structures.
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