Tubular and Parenchymatous

• Parenchymatous Organ is a solid organ of a stroma and a parenchyma.
• Stroma is the connective tissue support/framework of a solid organ.
• Capsule is composed of Loose Connective Tissue (LCT)/ irregular Dense White Fibrous Connective Tissue that envelops the solid organ.
• Septa are Loose Connective Tissue given off by the capsule that penetrate and divide the parenchyma into lobules (interlobular Connective Tissue Septa).
• Trabecula are composed of irregular DWFCT.
• Parenchyma is the functional part of a solid organ, consisting of groups of cells with a definite arrangement that perform the functions of a particular solid organ.
• The cells of the parenchyma are supported by a network of fine reticular, elastic or collagen fibers.
• Tubular organ is an hallow organ with a lumen (canal) and a wall.
• Tubular organ consists of 4 coats or tunics from the innermost or luminal surface to the outermost or Peripheral surface.
• Tunica Mucosa, commonly called as mucous membrane or wet membrane, is kept by secretions from lining epithelial or glandular cells of mucosal or submucosal glands.
• Tunica Mucosa may present 3 layers or laminae: Lining epithelium, Lamina propria, and Lamina muscularis mucosae.
• Tunica Submucosa is the second coat, located beneath the tunica mucosa, made up of Loose Connective tissue and contains blood vessels, nerves, autonomic ganglia and nerve plexuses.
• Tunica Muscularis is the third coat, smooth muscle tissue arranged into 2 layers which usually separated by blood vessels, nerves and autonomic plexus.
• Tunica Adventitia/Serosa is the outermost coat composed of loose connective tissue with blood vessels, nerves, myenteric ganglia and plexuses, and adipose cells.
• Tunica Serosa is derived from splanchnic mesoderm which forms the dorsal mesentery that suspends tubular organs from the dorsal wall.