Parotid gland

The coalescing interlobular ducts seen here exit into the surrounding interlobular connective tissue.  These larger interlobular ducts are lined by a stratified epithelium, initially stratified cuboidal, that eventually transitions into stratified columnar.  300x

The coalescing interlobular ducts seen here exit into the surrounding interlobular connective tissue.  These larger interlobular ducts are lined by a stratified epithelium, initially stratified cuboidal, that eventually transitions into stratified columnar.  300x

The coalescing interlobular ducts seen here exit into the surrounding interlobular connective tissue.  These larger interlobular ducts are lined by a stratified epithelium, initially stratified cuboidal, that eventually transitions into stratified columnar.  300x

The smaller interlobular ducts are lined by stratified cuboidal epithelium (blue arrows), which becomes stratified columnar as the duct enlarges (black arrow).

The smaller interlobular ducts are lined by stratified cuboidal epithelium (blue arrows), which becomes stratified columnar as the duct enlarges (black arrow).

The smaller interlobular ducts are lined by stratified cuboidal epithelium (blue arrows), which becomes stratified columnar as the duct enlarges (black arrow).