大脑镰
Falx cerebri
定义
大脑镰是位于大脑两半球之间的一个正中矢状位镰刀形硬膜皱襞。硬膜与蛛网膜共同覆盖整个大脑,使大脑表面的沟回难以直接观察。然而,在某些区域,硬膜的内层(脑膜层)与外层(骨膜层)分离,并向脑内延伸,形成皱襞或间隔,不仅将不同脑区分隔开来,还为大脑提供结构性支撑。
其中一个硬膜间隔即为大脑镰,其前端附着于筛骨筛板上表面一个称为鸡冠的骨嵴。向后,大脑镰附着于水平位的小脑幕。
參考資料
Kekere, V. and Alsayouri, K. Anatomy, Head and Neck, Dura Mater. [Updated 2023 Jul 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK545301/
Ghannam, J.Y. and Al Kharazi, K.A. Neuroanatomy, Cranial Meninges. [Updated 2023 Jul 24]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK539882/
Snell, R.S. (2010). ‘Chapter 15: The meninges of the brain and the spinal cord’, in Clinical Neuroanatomy. (7th ed.) Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins, pp.427-444.