Lab 8 - Higher Motor Function

Gross Anatomy

View and identify the structures in the illustration.

Figure 1 shows the superior surface of the cerebellum. The cerebellum is comprised of the cortex, which is seen in gross inspection, and the underlying cerebellar nuclei. The cerebellar cortex consists of a midline band, the vermis, and two expanded lateral lobes or hemispheres. On the superior surface, find the primary fissure separating the anterior lobe from the posterior lobe.

Figure 2 shows the gross anterior view of the cerebellum. Inferiorly, find the posterolateral fissure which separates the flocculonodular lobe from the posterior lobe.

Locate the three pairs of cerebellar peduncles. Note that the superior cerebellar peduncle is the major efferent tract out of the cerebellum. The fibers of the middle cerebellar peduncle arise from the pontine nuclei and other sources. The inferior cerebellar peduncle connects the cerebellum with the medulla and spinal cord.

Find the nodulus on the midline of the vermis and the flocculus which is located more laterally on the inferior surface.