One ofthe pair of nerves that arises from the anteriorend of the medulla oblongata in the vertebratebrain to supply the posterior rectus muscle ofeach eyeball. It contains chiefly motor nervefibers. See cranial nerves.脊椎動(dòng)物大腦內(nèi)起始于延髓前端的支配眼球后直肌運(yùn)動(dòng)的一對(duì)神經(jīng)......（本文共 249 字）     [閱讀本文] >>