728x90 신경외과56 Vascular anatomy Circle of Willis A balanced configuration of the Circle of Willis is present in only 18% of the population. Hypoplasia of 1 or both p-comms occurs in 22–32%, absent or hypoplastic A1 segments occurs in 25%. Key point: the anterior cerebral arteries pass over the superior surface of the optic chiasm ICA segment VA segment V1 prevertebral: from subclavian artery, courses superiorly and posteriorly.. 2020. 10. 9. Basic anatomy Motor cortex: 4 to 5.4 cm behind the coronal suture (개인차 있음) Numerous methods utilize external landmarks to locate the motor strip (pre-central gyrus) or the central sulcus (Rolandic fissure) which separates motor strip anteriorly from primary sensory cortex posteriorly. These are just approximations since individual variability causes the motor strip to lie anywhere from 4 to 5.4 cm behind the .. 2020. 10. 9. 이전 1 ··· 4 5 6 7 다음 728x90
