2021年2月4日 · The obex is the most caudal point within the fourth ventricle, as it narrows and communicates with the central canal of the spinal cord. It is one of four routes via which cerebrospinal fluid may flow from the fourth ventricle (the others being the …

The area postrema, a paired structure in the medulla oblongata of the brainstem, [1] is a circumventricular organ having permeable capillaries and sensory neurons that enable its dual role to detect circulating chemical messengers in the …

2024年5月23日 · The obex, Latin for barrier, is a small fold on the posterior surface of the medulla oblongata, located at the inferior apex of the fourth ventricle. It is formed by the unison of the left and right taeniae and divides the medulla oblongata into a closed part below containing the central canal and an open part above containing the inferior ...

2023年8月8日 · 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.

The fourth ventricle extends from the cerebral aqueduct (aqueduct of Sylvius) to the obex, and is filled with cerebrospinal fluid (CSF). The fourth ventricle has a characteristic diamond shape in cross-sections of the human brain. It is located within the pons or …

2025年1月8日 · The obex is the most caudal tip of the fourth ventricle. The fourth ventricle contains choroid plexus along its roof along the tela choroidea which may protrude out the lateral foramina of Luschka.

The obex* is a thin, triangular, gray lamina, at which the fourth ventricle narrows to become the central canal of the spinal cord. It is located in the lower angle of the ventricle and is attached by its lateral margins to the clavae.

2022年12月14日 · The area postrema, also known as the chemoreceptor trigger zone is one of the so-called circumventricular organs located on the dorsal inferior surface of the medulla oblongata at the caudal end of the fourth ventricle 1.

英文: In rat, from 0.8mm rostral of obex to .0mm caudal of obex, this area is .8mm long and 0.-. mm wide. 中文: 在大鼠该区从闩尾侧约.0mm平面至闩吻侧约0.8mm平面，吻尾长约.8mm，宽约0.-. mm。

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. The obex occurs in the caudal medulla. The decussation of sensory fibers happens at this point.