In the peripheral nervous system, which specific glial cell type is responsible for the formation and maintenance of the myelin sheath around a single axon segment?

Which histological layer of the cerebellum is characterized by a single row of large, flask-shaped neuronal cell bodies with extensive dendritic trees extending into the molecular layer?

In histological sections of the spinal cord, what is the name of the central canal lining composed of simple cuboidal to columnar ciliated epithelium?

In the connective tissue organization of a peripheral nerve, which layer consists of a thin, delicate layer of reticular fibers and scattered fibroblasts that immediately surrounds an individual nerve fiber and its associated Schwann cell?

In the central nervous system, which glial cells are characterized by their star-shaped morphology and play a critical role in forming the blood-brain barrier (BBB) via their perivascular end-feet?

In the histology of the peripheral nervous system, what is the specialized dense connective tissue sheath that surrounds a bundle of nerve fibers (a fascicle) and acts as a specialized blood-nerve barrier?

In a histological section of a multipolar neuron, the 'Nissl bodies' observed in the perikaryon under light microscopy correspond to which ultrastructural component?

In the spinal cord, the gray matter is organized into 'horns' containing different functional types of neurons. Which horn predominantly contains the cell bodies of somatic lower motor neurons whose axons exit via the ventral root?

In the white matter of the central nervous system, which immunohistochemical marker is most commonly used to identify the specialized glial cells responsible for myelinating multiple axons simultaneously?

In the peripheral nervous system, what is the name for the periodic gaps in the myelin sheath where the axolemma is exposed to the extracellular space, allowing for saltatory conduction?