Ciliated columnar epithelium lines respiratory tract (lower end of bronchi), fallopian tubes, ventricles of brain (ependyma) central canal of spinal cord, etc. Cuboidal epithelium occurs in certain parts of nephrons of the kidneys. Glandular epithelium are specialized for secretory activities, eg, unicellular, multicellular, exocrine, endocrine, heterocrine glands, etc. Squamous epithelium forms lining of blood vessels, lymph vessel, heart, peritoneum, pleura, Bowmans capsule, etc.