前部; 腹部[II]
Lobulus II vermis
定义
蚓部第II小叶是小脑前叶的组成部分。
根据Larsell命名系统,前叶包含蚓部的五个小叶(I至V)。这些小叶由多条横行裂隙的出现而形成,这些裂隙在内外侧平面上贯穿蚓部及小脑半球。按照经典命名系统,Larsell的蚓部第II小叶与第III小叶共同被标注为"中央小叶"。
从功能角度而言,蚓部第I至V小叶(前叶的组成部分)接受脊髓小脑传入通路的投射。这些传导束将感觉本体感受信息输入小脑,使其实时感知身体各部位的运动状态与空间位置。小脑将这些实时本体感受数据与原先在大脑中制定的运动计划进行匹配与比较,从而在潜意识层面对随意运动活动的监控与精细调节中发挥关键作用。
參考資料
Standring, S. and Gray, H. (2016). ‘Chapter 22: Cerebellum’ in Gray’s anatomy The anatomical Basis of Clinical Practice. (41st ed.) New York: Elsevier, pp. 331-335.
Bolk, I. (1906). Das Cerebellum der Saugetiere. Haarlem: Fischer. A classic text on the subdivision and the comparative anatomy of the mammalian cerebellum.
Larsell, O. and Jansen, J. (1972). The comparative anatomy and histology of the cerebellum. III. The human cerebellum, cerebellar connections, and cerebellar cortex. Minneapolis: University of Minnesota Press.
Snell, R.S. (2010). ‘Chapter6: The Cerebellum and its Connections’, in Clinical Neuroanatomy. (7th ed.) Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins, pp. 232-233.