Posterior quadrangular lobule
Lobulus quadrangularis posterior
A lobule on the upper surface of each cerebellar hemisphere, lying just behind the primary fissure at the front of the posterior lobe.
At a glance
- English
- Posterior quadrangular lobule
- Latin (TA2)
- Lobulus quadrangularis posterior
- System
- Brain and spinal cord
- Region
- Head
- Side
- Paired, left and right
About the posterior quadrangular lobule
The posterior quadrangular lobule is the most forward part of the posterior lobe of the cerebellar hemisphere, seen on its upper surface. It is also called the simple lobule, or hemispheric lobule VI in the numbered scheme of the cerebellum. In front of it lies the primary fissure, the deep fissure that divides the anterior lobe from the posterior lobe; behind it lies the posterior superior fissure.
Medially it is continuous with the declive, the part of the vermis that lies between the same two fissures, and together they form a single transverse band across the cerebellum. The anterior quadrangular lobule lies in front of it on the other side of the primary fissure, and the superior semilunar lobule lies behind it beyond the posterior superior fissure. Its folia run across the hemisphere and curve forwards at its lateral edge.
As part of the hemisphere, the lobule belongs mostly to the cerebrocerebellum. It receives input from the cerebral cortex through the pontine nuclei and the middle cerebellar peduncle, and its output passes through the dentate nucleus and the thalamus back to the cortex. Through this loop it helps plan and time movements and correct them as they happen. It continues the body map of the anterior lobe, with the face often placed here in imaging studies, and it also takes part in some non-motor tasks.
Lesions of the cerebellar hemisphere, such as a stroke or tumour, cause clumsiness of the limbs on the same side: inaccurate reaching, tremor towards the end of a movement and difficulty with rapid alternating movements. Speech may become slurred and irregular.
Function and supply
- Function
- Part of the cerebrocerebellum; helps plan, time and correct movements of the same side of the body, with a role in some non-motor tasks.
- Blood supply
- The superior cerebellar artery.
Anthromica
See the posterior quadrangular lobule where it really sits, with every layer of the body around it.
- Every layer, one body. Peel from muscle to bone, nerve, vessel and organ, and turn it any way.
- English and Latin. Every structure named the way your exam names it.
- Quiz until it sticks. Short drills on the structures you keep missing.
Free to start. No card.
