The correct option is
A irregular masses of RER and free ribosomes
Nissl’s granules are deeply stained particles present in the neuroplasm. They are an irregular mass of rough endoplasmic reticulum (RER) and free ribosomes.
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/798365/original_8.PNG)
The neuroglial cells that produce myelin sheath are called Schwann cells.
Endocrine glands are ductless glands that secrete their products directly into the fluid bathing the gland. E.g: Thyroid glands, pituitary glands, adrenal glands, etc.
Microglia are phagocytic neuroglial cells.
Endocrine glands are ductless glands.