下面部分; 腹部[H II]
Lobulus II hemisphaerii cerebelli
定义
小脑半球第二小叶(又称小叶II[H])是小脑半球前叶的组成部分。
根据Larsell的划分,前叶包含小脑半球的五个小叶(I至V[H])。这些小叶的形成源于多条横行裂隙的出现——这些裂隙在内外侧平面上贯穿小脑半球与蚓部。小脑半球第二小叶与小叶III[H]合称为"ala lobuli centralis"(依据经典命名法)。
从功能角度而言,小脑半球的小叶I至V[H]连同蚓部(即前叶),是脊髓小脑传入通路的主要接收区域。这些传导束将感觉本体感觉信息传入小脑,使其实时感知各身体部位的动作与位置。小脑将这一实时本体感觉数据与运动计划(最初由大脑制定)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.