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Possible Answers:
PSA.
Last seen on: Vulture Friday, 29 December 2023 Crossword Answers
Random information on the term “PSA”:
The posterior spinal artery (dorsal spinal arteries) arises from the vertebral artery in 25% of humans or the posterior inferior cerebellar artery in 75% of humans, adjacent to the medulla oblongata.[citation needed] It is usually double, and spans the length of the spinal cord. It supplies the grey and white posterior columns of the spinal cord.
The posterior spinal artery arises above the foramen magnum. It passes posteriorly to descend the medulla passing[citation needed] through and behind of the posterior roots of the spinal nerves. Along its course it is reinforced by a succession of segmental or radiculopial branches, which enter the vertebral canal through the intervertebral foramina, forming a plexus called the vasocorona with the anterior vertebral arteries.
Below the medulla spinalis and upper cervical spine, the posterior spinal arteries are rather discontinuous; unlike the anterior spinal artery, which can be traced as a distinct channel throughout its course, the posterior spinal arteries are seen as somewhat larger longitudinal channels of an extensive pial arterial meshwork. At the level of the conus medullaris, the posterior spinals are more frequently seen as distinct arteries, communicating with the anterior spinal artery to form a characteristic “basket” which angiographically defines the caudal extent of the spinal cord and its transition to the cauda equina.