The term vulva encompasses all the external female reproductive structures visible on the perineum. In clinical midwifery, understanding these boundaries is essential for performing accurate physical examinations, assessing perineal trauma after delivery, and repairing episiotomies.
Familiarity with these landmarks allows midwives to document vulvar findings clearly and communicate effectively during shift handovers.
The external genitalia consist of several distinct yet continuous structures, each serving protective and sensory functions.
The vulva receives a rich, robust blood supply, which explains why vulvar hematomas can form rapidly and become quite large following trauma or childbirth.
The primary arterial supply stems from the internal pudendal artery, a direct branch of the internal iliac artery. Additional superficial branches arise from the femoral artery, including the external pudendal arteries.
Venous return largely mirrors the arterial layout. Blood drains through the internal pudendal veins into the internal iliac venous system. A dense network of veins surrounds the vaginal vestibule and clitoris, known as the vestibular bulb plexus, which is particularly vulnerable to rupture during obstructed or instrumental deliveries.
Lymphatic drainage of the vulva follows a well-defined pathway that holds immense importance for staging and managing vulvar malignancies or severe localized infections.
Lymph from nearly all parts of the vulva—except the clitoris and the posterior labia minora—drains primarily into the superficial inguinal lymph nodes. From there, lymph flows into the deep inguinal nodes and subsequently into the external iliac nodes within the pelvis.
Midwives must inspect the groin area during routine postpartum and gynecological checks, as tender or enlarged inguinal nodes often signal an infection, bartholinitis, or localized trauma of the external genitalia.
The vulva is richly innervated, making it extremely sensitive to touch, pressure, and pain. This extensive innervation also explains why local anesthetic infiltration is necessary before performing procedures like an episiotomy or perineal repair.
Understanding vulvar anatomy directly translates to safe, competent midwifery care across antenatal, intrapartum, and postnatal periods.
During pregnancy, increased pelvic blood flow causes the vulva to appear engorged and hyperpigmented (Chadwick's sign), a normal physiological finding that can sometimes be mistaken for varicosities. Midwives must identify true vulvar varicosities, which can cause significant discomfort and require supportive garments or left-lateral positioning to ease pressure.
In the second stage of labor, controlled delivery of the head prevents excessive stretching and tearing of the delicate tissues of the labia and perineal body. Postnatally, inspecting the perineum and vulva ensures prompt detection of hematomas, wound dehiscence, or localized edema, facilitating early intervention and maternal comfort.