Clinical anatomy/clinical questions : head and neck: scalp : Explain anatomical basis of caput succedaneum

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Explain anatomical basis of caput succedaneum: It is a collection of fluid in the loose areolar tissue/fourth layer of the scalp.  The swelling is diffuse, crosses the sutures and the midlne and is over the presenting part of the head at delivery.  It  occurs  due to obstruction of venous return of scalp during the passage of head via the birth canal. Usually the edema subsides in  24-48 hrs.