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Clinical Anatomy of the Pelvis and Perineum

Pelvic Types

There are four basic pelvic types (see figure below), identified originally by Caldwell and Malloy in 1933, that have distinct shapes and therefore different effects on their suitability for childbirth. The average woman has a gynecoid pelvis; others may have a variation or mixture of types rather than pure android, anthropoid, or platypelloid types.

The four Caldwell-Malloy pelvic types. Differences in shape, inlet, midpelvis, and outlet dimensions are shown. Adapted from: Ward, SL, and Hisley, SM: Maternal-Child Nursing Care. FA Davis, Philadelphia, 2009, p 123.

For detailed anatomy of the pelvic girdle, refer to figures on pp. 691 and 692.

The muscles of the female pelvic floor. Adapted from: Ward, SL, and Hisley, SM: Maternal-Child Nursing Care. FA Davis, Philadelphia, 2009, p 116.

Innervation and arterial blood supply of perineum.

Female Reproductive Cycle

Levels of the hormones secreted from the anterior pituitary are shown relative to one another and throughout the cycle. Changes in the ovarian follicle are depicted. The relative thickness of the endometrium is also shown. Adapted from: Ward, SL, and Hisley, SM: Maternal-Child Nursing Care. FA Davis, Philadelphia, 2009 p 126.

Gynecological Care

Pelvic Floor Dysfunction (PFD)

The American Physical Therapy Association's (APTA's) Section on Women's Health (SOW) has defined pelvic floor dysfunction (PFD) based on common symptoms and functional presentation, as shown in Table 10.1.

Table 10.1Types of Urinary Incontinence and Their Relation to Pelvic Floor Dysfunction

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