Thrombophlebitis Blood clots in the leg can become very dangerous; symptoms include swelling, redness, and leg tenderness. Transient ischemic attack (mini-stroke) Transient ischemic attacks cause headache, numbness, tingling, or weakness in the face, arm, or leg, and more.
serous membrane, one of the many thin sheets of tissue that line closed cavities of the body, such as the pleura lining the thoracic cavity, the peritoneum lining the abdominal cavity, and the pericardium lining the sac that encloses the heart.
Visceral and parietal layers. Each serous membrane is composed of a secretory epithelial layer and a connective tissue layer underneath. The epithelial layer, known as mesothelium, consists of a single layer of avascular flat nucleated cells (simple squamous epithelium) which produce the lubricating serous fluid.