13 Papillae in tongueLingual taste buds sit on lateral borders of raised papillae. They are classified as:Fungiform: at tip & sides of tongueCircumvallate: just in front of terminal sulcusFoliate: at posterior lateral margins of tongueFiliform: centre of tongue, have no taste buds
21 Lower Limit of Nasopharynx Lower border of soft palate or Junction b/w hard & soft palateOropharynxTip of epiglottis or Body of hyoid bone or Base of valleculaHypopharynxLower border of cricoid orLower border of C6 vertebra
31 Waldeyer's tonsillar ring Vertically oriented, sub-epithelial lymphoid tissue ring located in pharynx, thought to function as a barrier to infection in first few years of life. Named after nineteenth century German anatomist Heinrich Wilhelm Gottfried von Waldeyer-Hartz.
43 Killian’s DehiscenceTriangular weak area between thyropharyngeus & cricopharyngeus part of inferior constrictorMucosa herniates through it to form hypo-pharyngeal pouch (Zenker’s diverticulum)Perforation occurs here during forceful oesophagoscopy (gateway of tears)
70 Fibrous coat (adventitia) Layer of loose, supportive fibrous tissueConducts major vessels & nerves longitudinallyA serosa formed by visceral peritoneum replaces adventitia of intra-abdominal segment of oesophagus