the vas deferens of the salamander rhyacotriton olympicus is composed of ( 1 ) a peritoneal epithelium , ( 2 ) connective tissue with fibroblasts , melanophores , circular smooth muscle , capillaries , and unmyelinated nerves within a collagenous matrix , and ( 3 ) an inner layer of cuboidal epithelium partially covered by ciliated squamous cells at the lumen .
C0014609
epithelium
C0221910
squamous cells