Cerebellum Anatomy PDF
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This document provides a detailed overview of the cerebellum, its parts, and its relationships to other brain structures. It explores the cerebellum's shape, surfaces, and the various fissures and notches that define its anatomical features. The text covers important anatomical details of the cerebellum.
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Cerebellum Site and relations : - It is the largest part of the hindbrain which lies in the posterior cranial fossa and is related to: a- Above: the tentorium cerebelli separating it from the cerebral hemispheres. b- In front: back of pons and me...
Cerebellum Site and relations : - It is the largest part of the hindbrain which lies in the posterior cranial fossa and is related to: a- Above: the tentorium cerebelli separating it from the cerebral hemispheres. b- In front: back of pons and medulla separated from them by the 4th ventricle. Parts of the cerebellum: It is composed of: i. Two large lateral cerebellar hemispheres formed of many gyri called folia separated by deep fissures (sulci). ii. Vermis: is a narrow median part joining the two cerebellar hemispheres. It is divided into superior and inferior vermis. Shape: The cerebellum has 1) Two notches : a- The anterior notch: A wide notch related to the back of the brain stem and it is the site of entrance of the cerebellar peduncles. b- The posterior notch: A narrow notch which receives the falx cerebelli. 2) Two surfaces : a) Superior surface: shows: Superior vemis: is a median longitudinal ridge connected with the superior surface of the cerebellar hemisphere. Fissura prima (primary fissure): is a wide V-shaped fissure which separates the anterior lobe from the middle lobe (posterior lobe) of superior cerebellar hemisphere. b) Inferior surface: shows: Inferior surface of each cerebellar hemisphere is separated from the other by a deep median longitudinal groove containing the inferior vermis. Flocculus: lies on each side, along the anterior border of the inferior surface of the cerebellar hemisphere. It is almost isolated from the cerebellar hemisphere by the postero-lateral fissure. The two flocculi are connected to the nodule forming the flocculo-nodular lobe. Fissures of the cerebellum : 1. Primary fissure: it runs on the superior surface separating the anterior lobe from the posterior lobe (middle lobe) 2. Posterolateral fissure: intervenes between the flocculonodular lobe from the rest of the cerebellar hemisphere. 3. The horizontal fissure: intervenes between superior and inferior surfaces of the cerebellum
