Cerebellum and Motor Flashcards
Superior Cerebellar Peduncle (input/output)
OUTPUT to the Midbrain
Middle Cerebellar Peduncle (input/output)
INPUT from CL Cerebral Cortex
Inferior Cerebellar Peduncle (input/output)
INPUT from IPS body
Flocculonodular Lobe (FXN)
Balance and gait
Which nucleus of the thalamus receives input from the Cerebellum?
VL (ventrolateral)
Injury to Cerebellum
Awkwardness of INTENTIONAL movements: Ataxia Asthenia Tremor Nystagmus
Injury to Basal Ganglia
Meaningless, unintentional/unexpected movements: Parkinsonism Chorea Athetosis Hemiballismus
Ataxia
Awkwardness of posture and gait
Poor coordination of movement
Finger nose test fail
Irregular spaced sounds
Asthenia
Muscles tire more easily than normal
Cerebellar Tremor
Tremors during purposeful movements
Parkinsonism
Degeneration of basal ganglia/substantia nigra
Rigidity Slowness Resting Tremor Mask-like faces Shuffling gate
Chorea
Sudden jerky and purposeless movements (e.g, Huntington’s)
Athetosis
slow-writhing snake like movements; especially of the fingers and wrist
Hemiballismus
sudden wild flail of one arm
Extensor Posture
Reticulospinal
Vestibulospinal
Flexor Posture
Rubrospinal
corticospinal
Decerebrate Posture
Bernie; Extensors
Below the red nucleus (Lesion)
CereBellum (Lesion)
Reticulospinal? & Vestibulospinal?
Decorticate posture
Mummy (Flexor) Rubrospinal tract Lateral Corticospinal tract Above red nucleus (lesion) Cerebral cortex, internal capsule, thalamus lesion
Red Nucleus
motor coordination
Input: CL cerebellum () & Ips Motor cortex (corticorubro)
Output: Cerebellum path: Medial Tegmentum–> inf olivary n & Rubrospinal path (CL Reticular formation in spinal cord)
Deep Cerebellar Nuclei
GABAergic (inhibition) from Purkinje cells
Glutametergic (excitation) from various pathways
Dentate, Interposed; Fastigii (Lat–>med)
Rubrospinal tract
Flexion; primary motor cortex– corticorubral projection (in Cerebral peduncle)–> Synapse in Red nucleus (midbrain)–Rubrospinal tract (decussates in midbrain) (travels with corticospinal tract)–>synapse in ventral horn–> muscles
Vestibulospinal tract
extensors; Lateral vestibular nucleus–> reticular formation (rostral medulla)–> spinal cord
