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Published in Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad, Neurosurgery, 2014
Vivian A. Elwell, Ramez Kirollos, Syed Al-Haddad
Colloid cyst – a benign, epithelium-lined cyst believed to originate from the anterior part of the third ventricle. The cysts are believed to derive from either primitive neuroepithelium of the tela choroidea or from the endoderm. Because of its location, it can cause obstructive hydrocephalus and increased intracranial pressure.
Anatomy and Cerebral Circulation of the Rat
Published in Yanlin Wang-Fischer, Manual of Stroke Models in Rats, 2008
Yanlin Wang-Fischer, Ricardo Prado, Lee Koetzner
The AChA arises from the internal carotid artery just after the beginning of the posterior communicating artery; it is a little more than 1 mm from the MCA in an adult female rat (250 to 300 g).5 The choroid artery runs for a short distance in the groove between the temporal lobe and the cerebral peduncle, curves dorsally around the latter, and pushes into the lateral ventricle along the choroid fissure, carrying the thin membranous medial wall of ventricle with it in such a way that the plexus formed by the artery is entirely surrounded by this membrane and the cerebral nerves actually penetrate into the cavity of the ventricle. In addition to the choroid plexi of the lateral ventricles, the choroid artery enters into the formation of the tela choroidea of the third ventricle in a similar fashion.
Microsurgical techniques for achieving gross total resection of ependymomas of the fourth ventricle
Published in Acta Chirurgica Belgica, 2020
Let us conceive of the fourth ventricular anatomy conceptually in order to facilitate a surgical understanding and appreciation of the relationships of its most critical structures and landmarks [48–52]. We accordingly describe the microsurgical anatomy and internal features of this most beautiful of Nature’s majestic designs [48,52]. The rostral roof the fourth ventricle is formed medially by the superior medullary velum and laterally by the bilaterally paired superior cerebellar peduncles. The caudal roof of the fourth ventricle is comprised rostrally by the midline nodule and laterally flanking inferior medullary velum draping mediolaterally, from which the tela choroidea drapes anteroinferiorly to attach to the dorsal surface of the myelencephalon. The telovelar margins insert into the taenia medullaris of the dorsal medulla. Two layers of delicate neural tissue comprise the tela choroidea. The ventricular surface of the tela choroidea houses the choroid plexus, constituted by cuboidal epithelium richly perfused by fenestrated capillary endothelium [48,52]. The median segment of the choroid plexus splays superolaterally towards the lateral recesses and foramina of Luschka bilaterally. Notable flocculus-adjacent tufts of choroid plexus in the deepest reaches of the cerebellopontine angle present a natural and useful surgical landmark to the astute neurosurgeon and may give rise to benign and malignant papillomatous choroid plexus neoplasms. Choroidal branches are provided by the posterior inferior cerebellar artery emanating from the vertebral artery and the anterior inferior cerebellar artery. The cerebrospinal fluid egresses from the fourth ventricle into the cisterna magna through the foramen of Magendie in the lower tela choroidea and into the lateral cerebellomedullary cisterns of Rhoton and cerebellopontine through the lateral recesses and foramina of Luschka [48,52].