Diagramatic representation shows which degree of perineal tear:
First-degree tear: Laceration is limited to the fourchette and superficial perineal skin or vaginal mucosa Second-degree tear: Laceration extends to perineal muscles and fascia, but not the anal sphincter Third-degree tear: Anal sphincters are torn Third-degree tears - Three subcategories: 3a: paial tear of the external anal sphincter involving less than 50% thickness 3b: greater than 50% tear of the external anal sphincter 3c: internal sphincter is torn Fouh-degree tear: Rectal mucosa is torn First and Second degree tears are called Paial Perineal tears. Third and Fouh degree tears are called Complete Perineal tears.
First degree
Second degree
Third degree
Fouh degree
Labour - normal, abnormal, malposition, malpresentation and their management