Educational reference · Anatomy

Female reproductive anatomy — a clinical reference

Understanding reproductive anatomy is the foundation of informed conversations about menstruation, fertility, pelvic pain, pregnancy, and surgery. This page is written as a patient-facing reference. It is descriptive rather than prescriptive — it is not a substitute for clinical evaluation when symptoms or concerns arise.

External structures (the vulva)

The vulva is the collective name for the external genitalia. It includes:

• Mons pubis — the fatty tissue overlying the pubic bone
• Labia majora and labia minora — the outer and inner folds of skin surrounding the vaginal opening
• Clitoris — a richly innervated organ; only its external glans is visible, with a much larger internal structure (crura and bulbs) extending into the pelvis
• Urethral meatus — the external opening of the urinary tract, situated below the clitoris
• Vaginal introitus — the vaginal opening, bordered by the hymen in adolescence
• Perineum — the area between the vaginal opening and the anus
• Bartholin’s and Skene’s glands — small glands whose ducts open near the introitus; relevant when cysts or abscesses form

Internal structures

Vagina

A muscular, elastic canal approximately 7 to 10 cm long, extending from the introitus to the cervix. The vaginal wall has three layers — mucosa, muscularis, and adventitia — and its acidic pH (typically 3.8 to 4.5) supports a protective microbiome dominated by Lactobacillus species.

Cervix

The lower, narrower part of the uterus that opens into the vagina. The cervix has two anatomically and histologically distinct zones — the ectocervix (lined by squamous epithelium, visible during speculum examination) and the endocervix (lined by columnar glandular epithelium). The boundary between them — the transformation zone — is where most cervical pre-cancers and cancers arise, which is why this zone is sampled during a Pap test.

Uterus

A pear-shaped, hollow, muscular organ approximately 7 to 8 cm long in the non-pregnant adult. It has three regions — the fundus (upper dome), the body or corpus (the main bulk), and the isthmus (the lower narrow segment that continues as the cervix).

The uterine wall has three layers:

• Endometrium — the inner mucosal lining that thickens and sheds with each menstrual cycle
• Myometrium — the thick smooth-muscle layer responsible for contractions during menstruation and labour
• Perimetrium — the thin outer serosal covering, continuous with the peritoneum

The uterus is typically anteverted and anteflexed but normal variants include retroverted positions; this is rarely of clinical significance by itself.

Fallopian tubes

Two muscular tubes, each approximately 10 cm long, connecting the uterine cavity to the peritoneal cavity adjacent to each ovary. Each tube is divided into four segments:

• Interstitial part — passes through the uterine wall
• Isthmus — narrow segment adjacent to the uterus
• Ampulla — the widest segment, where fertilisation typically occurs
• Fimbrial end — the flared, finger-like opening adjacent to the ovary that captures the released egg

The fimbriae are not directly attached to the ovary; the egg is captured through coordinated movement at ovulation.

Ovaries

Paired, almond-sized organs (approximately 3 × 2 × 1 cm) that house the ovarian follicles. Each ovary has two functional zones:

• Cortex — the outer zone containing the follicle pool
• Medulla — the inner zone with blood vessels and connective tissue

The complete follicle pool is established before birth. At birth, an ovary contains approximately 1 to 2 million follicles; this declines to around 300,000 by puberty and continues to decline through reproductive life. Only several hundred reach ovulation.

Pelvic floor and supporting structures

The pelvic organs are supported by a layered system — the levator ani muscle group, the endopelvic fascia, and uterine ligaments (uterosacral, cardinal, round, and broad). Pregnancy, vaginal delivery, ageing, and chronic strain (cough, constipation, heavy lifting) can weaken these supports, contributing to prolapse and incontinence.

Blood supply and lymphatic drainage

The reproductive organs receive blood from the uterine artery (a branch of the internal iliac) and the ovarian artery (a direct branch of the abdominal aorta). The two systems anastomose in the broad ligament, an important consideration in pelvic surgery.

Lymphatic drainage broadly follows arterial supply — uterine and cervical drainage to obturator and internal/external iliac nodes; ovarian drainage to para-aortic nodes. This anatomy underpins staging in gynaecological oncology.

Why anatomical literacy matters

• It enables you to describe symptoms more precisely
• It supports informed consent before any procedure
• It helps you understand why investigations are ordered the way they are
• It reduces anxiety by replacing vague mental models with concrete ones

Where this fits with our other educational resources

This anatomical reference complements our menstrual cycle physiology page and our pillar pages on gynaecology, endometriosis, IVF, and laparoscopy. If you have a specific clinical concern, please consult a clinician — these pages are not a substitute for individual evaluation.

Dr. Priyadatt Patel

Senior Gynecologist · Advanced Laparoscopic Surgeon · IVF and Endometriosis Programme Lead

MS OBGyn · Pregnancy Care · Advanced Gynaecological Ultrasound · Fertility Preservation

ESHRE / ESGE / AAGL / ASRM guideline-aligned practice. 3D Karl Storz precision technique. Fertility-preservation-first philosophy. Evidence-based decisions, honest counselling, long-term outcomes orientation.