<prompt> All of the following regarding esophagus are true except:Length is 25 cmsLower one third is lined by transitional epitheliumUpper two third is lined by stratified squamous epitheliumpass behind the Lt main bronchus  <response>: Ans b Lower one third is lined by transitional epitheliumEsophagus- LiningMucosa - stratified squamous non keratinized epitheliumSubmucosa - mucous gland throughout its length and lymphoid tissueMuscularis externa - toughest layerUpper one third - Striated muscleMiddle one third - Striated smooth muscleLower one third - smooth muscleAdventitiaDistance from incisor teethBony levelAnatomical landmarks115cmsC6Phnryngo esophageal junction222.5cms-Aorwc arch crosses it327.5cms-Lt bronchus crosses it440cmsT10Pierces diaphragmTotal length 25 cmsEsophageal constrictions 