**Question:** Space of Disse contains all EXCEPT

A. Arterial smooth muscle cells
B. T cells
C. Lymphocytes
D. Macrophages

**Core Concept:** Space of Disse is a specialized region within the arterial wall where blood and lymph cells interact. It is located between the internal elastic lamina (IEL) and the internal media (IM) in the adventitia.

**Why the Correct Answer is Right:** The correct answer (A) is right because arterial smooth muscle cells are part of the internal media (IM), which is not part of the Space of Disse. The Space of Disse is located between the internal elastic lamina (IEL) and the adventitia.

**Why Each Wrong Option is Incorrect:**

B. T cells are a type of lymphocyte involved in immune response and are found in the lymphatic system, not the arterial wall.

C. Lymphocytes are a type of white blood cell involved in immune response and are also situated in the lymphatic system, not the arterial wall.

D. Macrophages are immune cells involved in phagocytosis and are found in the adventitia and other tissues, not specifically within the Space of Disse.

**Why T cells, lymphocytes, and macrophages are wrong:** These cells are part of the lymphatic system or are found in other arterial wall layers, not specifically within the Space of Disse.

**Clinical Pearl:** Space of Disse plays a crucial role in maintaining vascular homeostasis through facilitating the exchange of proteins, cells, and immune responses between blood and lymphatic vessels. It helps to regulate inflammation, immune responses, and fluid balance in the arterial wall. Understanding the spatial anatomy of the Space of Disse is essential for understanding vascular pathophysiology and clinical implications.