👉 Peritrema is a medical term that refers to the tissue or connective tissue surrounding a blood vessel, particularly in the brain. It's often associated with the brain stem and is responsible for regulating blood flow and oxygen delivery to specific parts of the brain. These tissues are crucial for maintaining normal brain function and can be damaged or affected by various conditions like stroke, tumors, or infections. The term "peritrema" is also used in the context of disorders related to the nervous system, such