Protoplasmic refers to a type of cellular morphology that is characterized by a highly branched structure and a relatively small cell body. This morphology is commonly observed in glial cells called protoplasmic astrocytes, which are found in the gray matter of the brain and spinal cord.

Protoplasmic astrocytes have numerous short, highly branched processes that extend from their cell body, giving them a star-shaped appearance. These processes are involved in forming a network of connections with other astrocytes and neurons in the brain, allowing for the exchange of information and nutrients.

Protoplasmic astrocytes play important roles in supporting neuronal function by regulating the extracellular environment, promoting synaptogenesis, and providing metabolic support to neurons. They are also involved in the formation of the blood-brain barrier and play a role in modulating synaptic transmission.

Overall, the protoplasmic morphology of astrocytes is essential for their function in the central nervous system, and alterations in their morphology can contribute to neurological disorders.