问题 问答题 简答题

简述椎管壁的构成及其内容的名称。

答案

参考答案:

椎管是由各椎骨的椎孔、骶骨的骶管与椎骨之间的骨连结共同组成的骨纤维性管道,向上经枕骨大孔通颅腔,向下终于骶管裂孔。椎管前壁由椎体后面、椎间盘后缘和后纵韧带构成;后壁为椎弓板、黄韧带和关节突关节;两侧壁为椎弓根和椎间孔。椎管骶段由骨性融合的骶椎椎孔连成,称为骶管,是骨性管道。

椎管内容物有脊髓、脊髓被膜、脊神经根、血管、神经、淋巴管及少量结缔组织等。

单项选择题 A1型题
单项选择题

Writing about music is like dancing about architecture, or so the saying goes. Sometimes attributed to Frank Zappa, other times to Elvis Costello, this quote is usually intended to convey the futility of such an endeavor, if not the complete silliness of even attempting it. But Glenn Kurtz’s graceful memoir, Practicing: A Musician’s Return to Music, turns the expression on its head, giving it a different meaning by creating a lovely, unique book.
Kurtz picked up the guitar as a kid in a music-loving family, attended the Long Island music school, and went on to play on Merv Griffin’s TV show before graduating from Tufts University. Motivating the young Kurtz was the dream of reinventing classical guitar, as if by his great ambition alone he could push it from the margins of popular interest to center stage-something not even accomplished by the late Spanish guitarist Andres Segovia, perhaps the only artist of the form ever to reach anything resembling widespread celebrity.
This book reads like a love story of sorts: Boy meets guitar. Boy loves guitar. Guitar breaks boy’s heart or, more precisely, the ordinariness of a working musician’s life does so. "I’d just imagined the artist’s life naively, childishly, with too much longing, too much poetry and innocence and purity," Kurtz writes. "The guitar had been the instrument of my dreams. Now the dream was over. "
Boy leaves guitar. Were the story to end here, this book would be a tragedy, but after nearly a decade the boy returns to guitar, and although he has lost the enthusiasm he had in his youth, he finds his love of the guitar again in a way he never could have appreciated before.
Although Kurtz is writing about a unique musical path, his journey speaks eloquently to the heart of anyone who has ever desperately yearned to achieve something and felt the sting of disappointment. "Everyone who gives up a serious childhood dream—of becoming an artist, a doctor, an engineer, an athlete—lives the rest of their life with a sense of loss, with nagging what it is," he writes. "Is that time and effort, that talent and ambition, truly wasted \

The quotation mentioned in Paragraph 1 implies that writing about music is ______.

A.an ambitious attempt

B.a modern form of art

C.an impossible task

D.a rewarding experience