FORAMEN MAGENDII, Area postrema , obex , aivoselkäydinnestetilavuuksista

Neuroanatomy, Area Postrema

Mariam Mirza  ¹ , Joe M Das  ²

In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan.

2022 Aug 8.

Affiliations

• PMID: 31334969
• Bookshelf ID: NBK544249

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 Excerpt

The area postrema is a highly vascular paired structure in the medulla oblongata in the brainstem. It lies in the caudal fourth ventricular floor, overlying the inferior portion of vagal trigone while facing the foramen of Magendie and rostral to the obex, the inferior point of the floor of the fourth ventricle. It is between the funiculus separans and the gracilis tubercle, lying adjacent to the nucleus of tractus solitarius. The description of the structure has been as ‘arched wings’ that are open on the sides of the fourth ventricle, as they separate upward from the central canal.

Copyright © 2023, StatPearls Publishing LLC.

Conflict of interest statement

Disclosure: Mariam Mirza declares no relevant financial relationships with ineligible companies.

Disclosure: Joe M Das declares no relevant financial relationships with ineligible companies.

 

lisätieto:Liquorkiertokuva: https://upload.wikimedia.org/wikipedia/commons/6/6d/1317_CFS_Circulation.jpg

Aperturra lateralis ventriculii quarti ( Foramina Luschkae)  -> Cistarna pontis   yhteydet

Apertura  mediana ventriculi  quarti (Foramen Magendii ) -> Cisterna cerebellomedullaris  yhteys Näiden  kolmen aukkojen kautta  Liquor cerebrospinalis  pääsee Cavum subarachnoidale - tilaan.

OBEX

 https://en.wikipedia.org/wiki/Obex

 

The obex (from the Latin for barrier) is the point in the human brain at which the fourth ventricle narrows to become the central canal of the spinal cord. Cerebrospinal fluid can flow from the fourth ventricle into the obex. In anatomical studies, the obex has been found to occur approximately 10-12 mm above the level of the foramen magnum. In patients with low tonsillar position, the obex has been found below the plane of the foramen magnum.^[1]

The obex occurs in the caudal medulla.

The decussation of sensory fibers happens at this point. 

 

SPINAL CSF LEAK,  https://spinalcsfleak.org/about-spinal-csf-leaks/diagnosis-of-spinal-csf-leak/

Nykyaikaisesta (ylemmästä, siis  ei lumbaali-) liquorpunktiosta  katsausta: https://www.ncbi.nlm.nih.gov /books/NBK560630/