part_of starts_at ends_at lamina propria of bladder outer lamina propria of bladder The outer lamina propria of bladder (olpbl) (syn: muscularis mesenchyme of bladder) (TS:22-TS:28) is the outer mesenchymal layer or outer lamina propria layer of the bladder located adjacent to the detrusor muscle of bladder. Contains loosely organized connective tissue, many small blood vessels and nerves, and discontinuous wisps of smooth muscle cells marked by smooth muscle alpha actin. At E14-E16 this layer is marked by Gli3 and Myocd (DeSouza et al 2013). Contains nerve of outer lamina propria of bladder (TS:22-TS:28). anatomical_structure EMAPA:36076 muscularis mesenchyme of bladder TS22 TS28