The spelling of "molecular layer" is fairly straightforward. It is pronounced as [məˈlɛk.jə.lər ɫeɪ.ər] in IPA phonetic transcription. The first syllable "mo-" is pronounced with a short "o" as in "mom." The second syllable "-lec-" is pronounced with a schwa sound followed by a "k" and a long "e." The final syllable "-lar" is pronounced with a dark "l" followed by a long "a" and a short "r." "Molecular layer" refers to a thin layer of cells in certain regions of the brain.
The molecular layer refers to a specific region found in various biological tissues, particularly in the brain and cerebellum. It is a distinct layer where the molecular organization of the tissue is notably different from the surrounding layers. In the brain, the molecular layer is often observed in the cerebral cortex, which is the outermost layer responsible for complex cognitive functions. Within the cerebral cortex, the molecular layer is the outermost layer, situated above the external granular layer.
In the molecular layer of the cerebellum, which is responsible for movement coordination and balance, it is found between the Purkinje cell layer and the granule cell layer. This layer is where the dendritic trees of the Purkinje cells extend, forming a dense network of neuronal connections. Additionally, the molecular layer of the cerebellum contains parallel fibers, which are critical for the communication between different types of neurons.
The term "molecular layer" is derived from the molecular organization and composition of cells within this region. It is particularly characterized by the presence of complex synaptic connections and a high density of axons, dendrites, and various types of interneurons. The molecular layer plays a crucial role in the transmission and integration of neural signals, allowing the integration and processing of information in complex neural networks. Its distinctive molecular architecture and cellular organization make it a significant element in understanding the functioning of various neurological processes and diseases.
Stratum moleculare.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
The word "molecular" is derived from the Latin word "molecula", which means a small mass or little mass. It is the diminutive form of "moles", meaning mass. "Molecules" are formed when atoms bind together, forming a small mass.
The word "layer" is derived from the Old English word "leagere", meaning a sheet or a stratum. It is related to the Old Norse word "lag", which also means a layer or a sheet. A layer is a distinct or continuous sheet-like substance that lies over or under another.
When "molecular" and "layer" are combined, the term "molecular layer" refers to a specific layer of material or substance that consists of molecules. In particular, it can refer to a layer in a larger structure or system where molecules are arranged or present.