Correct option is C
Explanation-
Pericytes are contractile cells that wrap around the endothelial cells of capillaries and venules. They are embedded within the basement membrane of these small blood vessels. The function of pericytes is to regulate blood flow, stabilize capillary walls, involved in angiogenesis (formation of new blood vessels), act as stem cells for repair and form part of the blood-brain barrier in CNS.
Incorrect options-
Option A - Myelin sheath - Myelin sheath surrounds neurons and is formed by Schwann cells (PNS) or oligodendrocytes (CNS) — not pericytes.
Option B - Surrounding coat of skeletal muscle fiber - Muscle fibers are covered by endomysium, perimysium, and epimysium — no pericytes involved.
Option D - Lymph capillary wall - Lymphatic capillaries lack a continuous basement membrane and do not contain pericytes.
So, the correct answer is option C - Blood capillary wall
