Structure and innervation of the labia minora: more than minor skin folds

Simultaneous Surgery of the Clitoral Hood-Labia Minora Complex with the Central Neurovascular Pedicle Retained

BACKGROUND

Hypertrophy of the labia minora with clitoral hood redundancy always occurs simultaneously and should be considered in its entirety. This study investigated a new simultaneous procedure for the clitoral hood-labia minora complex (CLC) that retains the central neurovascular pedicle.

METHODS

This retrospective observational study, conducted between January 2021 and August 2022, included 29 patients with labia minora hypertrophy and clitoral hood redundancy who underwent a surgery wherein procedures on the CLC were performed simultaneously. A divisional design to separate the medial and lateral labia minora and to remove the skin and subcutaneous tissue asymmetrically, while retaining the central neurovascular pedicle and the natural margin of labia minora, was employed. Postoperatively, all patients were followed up via the Internet or at the outpatient clinic. The follow-up included observing postoperative outcomes and any complications and completing the satisfaction questionnaires.

RESULTS

All the patients who underwent surgery showed good wound healing without discomfort of thread friction. Postoperatively, the labia minora had a natural appearance and retained sexual sensitivity. The scarring on the surgical incision was not evident. Hematoma and evident bilateral asymmetry occurred in one patient each. The satisfaction rate within 14 days and after 3 months of surgery was 96.6% and 92.6%, respectively.

CONCLUSIONS

This method uses a hidden incision, to remove the hypertrophic tissue and retain the natural edge and shape of the labia minora. Qualitatively, the patients were highly satisfied. This method was safe, effective, and easy to implement.

LEVEL OF EVIDENCE IV

This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

An Algorithm for Labia Minora Reduction Based on a Review of Anatomical, Configurational, and Individual Considerations

A variety of reduction labiaplasty techniques have been introduced to date, but no single technique will offer the optimal solution for every patient. Rather, the technique should be chosen based on anatomical, configurational, and technical considerations, as well as on patients' personal preferences regarded maintenance of the labial rim, maintenance of labial sensitivity, and prevention of iatrogenic thickening of the labium. We reviewed, defined, and assessed labial configurational variety, neurovascular supply, reduction techniques, and patient's preferences as the considerations relevant to the choice of labiaplasty technique. Based on this review, an algorithm was constructed that leads to a choice of reduction technique through five decisions to be made regarding (1) resection or (partial) retention of the labial free rim, (2) the measure of required labial width reduction, (3) labial vascular status, (4) prevention of iatrogenic labial thickening, and (5) preservation of labial sensibility. The choice of techniques includes edge trimming, central spindle form de-epithelialization or full-thickness resection, and three modifications of the wedge resection or de-epithelialization technique. These three modifications comprised a modified anterior resection or de-epithelialization combined with posterior flap transposition, a custom flask resection or de-epithelialization, and a modified posterior wedge resection or de-epithelialization combined with anterior flap transposition. Use of the five decisional steps and the inclusion of modifications of all three conventional reduction techniques offer an improved algorithm for the choice of labioplasty technique.

Three-Step Excision: An Easy Way for Composite Labia Minora and Lateral Clitoral Hood Reduction

BACKGROUND

Hypertrophy of the labia minora with lateral clitoral hood redundancy is common, but the excess clitoral hood is often overlooked during labiaplasty, which may result in imbalanced and unsatisfactory outcomes. The purpose of this study was to present an easy method of three-step excision for composite labia minora and lateral clitoral hood reduction.

METHODS

The procedure was performed in three steps: the prominent clitoral hood skin parallel to the labia majora and the clitoral hood sulcus was removed first; then, the protuberant portion of the labia minora was removed by wedge resection; and finally, a triangle at the junction between the labia minora and the clitoral hood was trimmed. Patients were required to return for examination on the first day and within 14 days after surgery. Follow-ups were arranged on the Internet or at the outpatient clinic. Satisfaction questionnaires were completed during follow-up.

RESULTS

Between January of 2016 and January of 2020, 136 patients underwent composite labia minora and lateral clitoral hood reduction. Ages ranged from 9 to 55 years. Six patients experienced complications (4.4 percent) and five underwent revision surgery (3.7 percent). The overall satisfaction rate within 14 days and after 3 months following surgery was 91.0 percent and 95.5 percent, respectively. Preoperative discomfort was resolved in 43.0 percent and significantly relieved in 54.2 percent, and sex life was improved in 70.9 percent.

CONCLUSIONS

Three-step excision is effective and safe for composite labia minora and lateral clitoral hood reduction with very high satisfaction. Considering the advantages of easy preoperative design and controllable tissue removal, this method could be a better alternative to the present procedures.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

The Safe Practice of Female Genital Plastic Surgery

The purpose of this article is to guide surgeons in the safe practice of female genital plastic surgery when the number of such cases is steadily increasing. A careful review of salient things to look for in the patient's motivation, medical history, and physical examination can help the surgeon wisely choose best candidates. The anatomy is described, with particular attention given to the variations not generally described in textbooks or articles. Descriptions are included for labiaplasty, including clitoral hood reduction, majoraplasty, monsplasty, and perineoplasty with vaginoplasty. Reduction of anesthetic risks, deep venous thromboses, and pulmonary emboli are discussed, with special consideration for avoidance of nerve injury and compartment syndrome. Postoperative care of a variety of vulvovaginal procedures is discussed. Videos showing anatomic variations and surgical techniques of common female genital procedures with recommendations to reduce the complication rate are included in the article.

A preliminary observational study on the vascular, nerve, and lymphatic anatomy and histology of the labia minora from cadaveric and surgical samples

INTRODUCTION AND HYPOTHESIS

To better understand details of the fine anatomy of the labia minora, present images of the vascular anatomy and characterize the nerve and lymphatic distribution of the labia minora.

METHODS

Two fixed and five fresh cadaveric specimens were perfused and dissected, and the vascular network was photographed. Labia minora samples, prepared from cadavers, and tissue resulting from labia reduction surgery underwent hematoxylin and eosin staining and S100 and D2-40 immunohistochemical staining.

RESULTS

Arteries emanated from the base to the edge of the labia minora, where there was a larger feeding artery, and the arteries were anastomosed. The veins formed anastomotic branches in the same direction as the edge of the labia minora. Arteries and veins that accessed the labia minora were successfully perfused at the same time with no obvious association. Sensory nerve endings were abundant, mostly larger with myelinated nerve trunks and Schwann cells in the central area with suggested neurovascular associations and smaller with no obvious aggregation at the edge. The medial area had 23.63 ± 11.82 nerves/view, the lateral area 21.30 ± 11.49 nerves/view (P > 0.05). The thickest nerve bundle was 3.16 ± 1.41 mm from the medial epidermis and 3.13 ± 1.47 mm from the lateral epidermis. Lymphatic vessels showed no obvious regional distribution. Labia minora were 21.77 ± 5.69 mm wide with 252.87 ± 63.01 lymphatic vessels at 3.67 ± 1.61/mm2 density. The shortest inner diameter of dilated lymphatic vessels was 161.09 ± 49.99 μm.

CONCLUSION

A larger feeding artery exists in the labia minora, which should be noticed in the pre-surgery design of labiaplasty. No difference was observed in the nerve distribution between the medial and lateral sides. Lymphedema might not be the cause of labial hypertrophy.

Safety in Female Genital Plastic Surgery

LEARNING OBJECTIVES

After studying this article, participants should be able to: (1) Identify the most appropriate type of anesthesia for the female genital plastic surgical patient and minimize risks of nerve injury and thromboembolic event through proper preoperative evaluation and knowledge of positioning. (2) Define the vulvovaginal anatomy, including common variants, and assess vulvovaginal tissues after childbirth and menopause. (3) Apply surgical techniques to minimize complications in female genital plastic surgery. (4) Classify the types of female genital mutilation/cutting and design methods of reconstruction after female genital mutilation/cutting.

SUMMARY

Female genital plastic surgery is growing in popularity and in numbers performed. This CME article covers several aspects of safety in the performance of these procedures. In choosing the best candidates, the impact of patient motivation, body mass index, parity, menopause and estrogen therapy is discussed. Under anesthesia, consideration for the risks associated with the dorsal lithotomy position and avoidance of compartment syndrome, nerve injury, deep venous thromboses, and pulmonary embolus are covered. Anatomical variations are discussed, as is the impact of childbirth on tissues and muscles. Surgical safety, avoidance of complications, and postoperative care of a variety of vulvovaginal procedures are discussed. Videos showing anatomical variations and surgical techniques of the most common female genital procedures with recommendations to reduce the complication rate are included in the article. Finally, female genital mutilation/cutting is defined, and treatment, avoidance of complications, and postoperative care are discussed.

Anatomy, histology, and nerve density of clitoris and associated structures: clinical applications to vulvar surgery

BACKGROUND

A precise understanding of structures comprising the female external genitalia is essential in obstetric and gynecologic practice.

OBJECTIVE

To further characterize the anatomy, histology, and nerve density of the clitoris and associated structures, and to provide clinical correlations to vulvar surgery.

MATERIALS AND METHODS

Unembalmed female cadavers were examined. The length and width of the body, glans, and crura of the clitoris were measured. Distances from the glans to the urethra and from the dorsal surface of the clitoral body to the mid pubic arch were recorded. The path of the dorsal nerve of the clitoris was examined, and the nerve width was measured as it emerged from the lateral surface of crura and at the distal clitoral body. Distances from where the dorsal nerve emerged from the perineal membrane to the posterior surface of the membrane and to mid pubic arch were measured. Connective tissue layers associated with the clitoris were examined. Tissue was harvested from additional unembalmed cadavers, and nerve density of the labia minora, glans, and clitoral body were analyzed. Histological examination was performed on vulvar structures to clarify tissue composition. Descriptive statistics were used for data analyses.

RESULTS

A total of 27 cadavers (aged 48-96 years) were examined, 22 grossly and 5 histologically. The median length and width of clitoral body were 29 mm (range, 13-59 mm) and 9 mm (range, 5-14 mm), respectively. The glans was 8 mm (range, 5-12 mm) long and 4 mm (range, 3-10 mm) wide. The length of the crura was 50 mm (range, 25-68 mm), and the width at the anterior portion was 9 mm (range, 2-13 mm). The closest distance from the glans to the urethra was 25 mm (range, 14-37 mm) and from the clitoral body to the mid pubic arch was 29 mm (range, 14-46 mm). The widths of the dorsal nerve at the lateral crura and at the distal clitoral body were 3 mm (range, 2-4 mm) and 1 mm (range, 1-2 mm), respectively. The distance from the dorsal nerve as it emerged from the perineal membrane to the mid pubic arch was 34 mm (range, 20-48 mm) and to the posterior surface of the membrane was 20 mm (range, 8-31 mm). The dorsal nerve and artery of the clitoris coursed adjacent to the medial surface of the inferior pubic ramus surrounded by a dense fibrous capsule adherent to the periosteum. The nerve and artery then coursed deep to dense connective tissue layers, which were contiguous with the suspensory ligament and fascia of the clitoris. Histologic examination revealed the presence of erectile tissue in the clitoral body, crura, and vestibular bulbs, but such tissue was absent in the glans and labia minora. Nerve density analysis revealed statistically significant greater density in the dorsal compared with ventral half of the clitoral body. Although not statistically significant, there was increased nerve density in the distal compared to the proximal half of the labia minora.

CONCLUSION

Precise knowledge of clitoral anatomy and associated neurovascular structures is essential to safely complete partial vulvectomies, clitoral and vulvar reconstructive procedures, anti-incontinence surgeries, and repair of obstetric lacerations. Understanding the range of anatomic variations and awareness of the areas of increased nerve density is important during counseling and surgical planning. Although the dorsal nerve of the clitoris courses deep to dense connective tissue layers, inadvertent injury may occur in the setting of deep dissection or suture placement. The dorsal nerve seems most vulnerable with surgical entry or lacerations that extend from the midline of the prepuce to the inferior pubic rami.

The Physiology of Female Sexual Function and the Pathophysiology of Female Sexual Dysfunction (Committee 13A)

INTRODUCTION

The article consists of six sections written by separate authors that review female genital anatomy, the physiology of female sexual function, and the pathophysiology of female sexual dysfunction but excluding hormonal aspects.

AIM

To review the physiology of female sexual function and the pathophysiology of female sexual dysfunction especially since 2010 and to make specific recommendations according to the Oxford Centre for evidence based medicine (2009) "levels of evidence" wherever relevant.

CONCLUSION

Recommendations were made for particular studies to be undertaken especially in controversial aspects in all six sections of the reviewed topics. Despite numerous laboratory assessments of female sexual function, genital assessments alone appear insufficient to characterise fully the complete sexual response.

Clitoral Epidermal Inclusion Cyst Resection With Intraoperative Sensory Nerve Mapping Technique

BACKGROUND

Despite the ever increasing popularity of labial and clitoral surgeries, the best practices and long-term effects of reconstructive procedures in these regions remain unknown. This is particularly noteworthy because the presentation of nerve-related symptoms may be delayed up to a year. Despite the convention that these surgical procedures are low risk, little is known about the best practices that may reduce the postoperative complications as a result of these reconstructive surgeries. We describe a preoperative sensory mapping technique in the context of a symptomatic inclusion cyst in the clitoral region. This technique delineates anatomical and functional regions innervated by the dorsal clitoral nerve while minimizing the vascular watershed area in the midline.

CASE

A prototypical case of a patient with a clitoral mass is discussed with clinical history and surgical approach. Prior to surgical excision, the dorsal clitoral nerve distribution was mapped in order to avoid a surgical incision in this sensual zone.

CONCLUSIONS

In our practice, preoperative sensory mapping is a clinically useful planning tool that requires minimal instrumentation and no additional operating time. Sensory mapping allows identification of the functional zone innervated by the dorsal clitoral nerve, which can aid in minimizing damage to the area.

A Prospective Evaluation of Female External Genitalia Sensitivity to Pressure following Labia Minora Reduction and Clitoral Hood Reduction

BACKGROUND

Little research has been conducted into the effects of labiaplasty on sensitivity of external genitalia. This study aimed to determine the effect of labia minora and clitoral hood reduction using the edge resection technique on external genitalia sensitivity.

METHODS

Female subjects electing to undergo labia minora and clitoral hood reduction were enrolled. Subjects underwent sensitivity testing using monofilaments at five locations (one at the clitoral hood and four labial with each labium measured 0.5 cm from the leading edge and 1.5 cm distal to the hymen) at baseline; 2 weeks; and 3, 6, and 12 months postoperatively. Self-evaluations using the Sexual Function Questionnaire were performed at baseline and 3, 6, and 12 months postoperatively.

RESULTS

Thirty-seven subjects undergoing labia minora and clitoral hood reduction were enrolled. Subjects experienced a median increase in sensitivity at month 6 of 0.118 mN at the 0.5-cm right labial location (p = 0.027) and 0.059 mN at the 0.5-cm left labial location (p = 0.046) compared with baseline. No change in sensitivity was demonstrated at the clitoral hood or either of the 1.5-cm labial locations. At 6 months, an increase in the number of sexual relations was observed in 44.1 percent of subjects (p = 0.011), an improvement in orgasm frequency was exhibited by 35.3 percent of subjects (p = 0.013), and an increase in orgasm strength was observed in 35.3 percent of subjects (p = 0.006).

CONCLUSION

Labia minora and clitoral hood reduction as performed by the trim/edge resection method does not result in diminished sensitivity.

CLINICAL QUESTION/LEVEL OF EVIDENCE

Therapeutic, IV.

A Cadaveric Study of the Arterial Blood Supply of the Labia Minora

BACKGROUND

Labiaplasty has become a rather common operation. The main complication of the different surgical techniques is the dehiscence of the suture line. The dehiscence rate varies among the different techniques, and this may imply that the vascular anatomy is not respected in some cases. The detailed arterial anatomy of labia minora is not well described, so the aim of the authors was to describe this anatomy with a cadaveric study.

METHODS

Eleven fresh cadavers were dissected, and arterial study was made with injected computed tomography scans and rotational angiography. At the end, a cast of the arterial network was made and chemically exposed to verify the radiological findings.

RESULTS

The findings of this study allowed identification of a dominant central artery that was named "C" artery, two posterior arteries named "P1" and "P2," and one small anterior artery, "A." Furthermore, a connection between the anterior system of the external pudendal artery and the posterior system of the internal pudendal artery was confirmed.

CONCLUSIONS

The arterial network of the labia minora was identified with this study. This may help surgeons orientate the wedge excision when they perform labiaplasties. More precisely, when this wedge is placed at the most anterior part of the labia minora, the least perfused area is removed, and a posterior flap is created that will preserve a robust blood perfusion.

Anatomy of the clitoris and its impact on neophalloplasty (metoidioplasty) in female transgenders

The current management of female to male transgender surgery is based on the advances in neophalloplasty, perioperative care and the knowledge of the female genital anatomy, as well as the changes that occur to this anatomy with preoperative hormonal changes in transgender population. Since the clitoris plays the main role in female sexual satisfaction, its impact on the outcome in female to male transgender surgery is predictable. Although female genital anatomy was poorly described in majority of anatomical textbooks, recent studies have provided a better insight in important details such as neurovascular supply, ligaments, body configuration, and relationship with urethral/vaginal complex. This article aims to review current state of knowledge of the clitoral anatomy as well its impact on clitoral reconstruction in female to male sex reassignment surgery.