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Partogram

Partogram is a graphical representation of the progress of labour depicting cervical dilatation and station of head plotted against time The concept of partogram was first introduced by
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Waldeyer's lymphatic ring

Waldeyer’s lymphatic ring is a collection of lymphoid tissue present in the neck (Waldeyer’s outer ring) and pharynx (Waldeyer’s inner ring /  Waldeyer’s tonsillar ring) It plays an
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Constrictions of oesophagus

The esophagus has 4 areas where the lumen is narrow compared to the rest of the oesphagus. They are: Beginning of oesophagus (pharyngoesophageal junction) – 6 inches from incisor teeth
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