Pelvic Floor Terminology: Definitions, Etymology, and Context

[From Latin: bulbus (bulb) + spongiosus (spongy)] A paired superficial perineal muscle that wraps around the base of the penis and the bulb of the urethra. In the context of pelvic floor anatomy, it is classified as part of the superficial perineal pouch musculature, distinct from the deeper levator ani group. In male anatomy, it contributes to urinary and reproductive system function. In some exercise frameworks, it is considered alongside the deeper levator ani in descriptions of voluntary pelvic floor contraction, though it is anatomically separate from the pelvic diaphragm.

Related terms: Ischiocavernosus, Perineal body, Perineum

[From Greek: kokkyx (cuckoo, referring to the coccyx bone's shape)] A muscle of the posterior pelvic floor, running from the ischial spine to the lateral borders of the coccyx and sacrum. Together with the levator ani, it forms what anatomists refer to as the pelvic diaphragm. The coccygeus is sometimes listed separately from the levator ani in anatomical descriptions. In exercise literature, it is less frequently discussed individually than the levator ani components, but is part of the overall muscle group engaged in pelvic floor exercise.

Related terms: Levator Ani, Pelvic Diaphragm, Sacrum

[From Greek: diaphragma (partition)] The dome-shaped muscular structure separating the thoracic and abdominal cavities, primarily responsible for breathing. In the context of pelvic floor discussion, the respiratory diaphragm is relevant because it works in functional coordination with the pelvic floor. During inhalation, the diaphragm descends and intra-abdominal pressure rises; the pelvic floor responds by lengthening slightly. During exhalation, the sequence reverses. This coordinated movement is central to integrated core and pelvic floor frameworks and is distinct from the pelvic diaphragm, which is an alternative name for the levator ani and coccygeus.

Related terms: Pelvic Diaphragm, Intra-abdominal Pressure, Transversus Abdominis

[From Latin: sphincter, from Greek sphingein (to bind)] A ring of striated muscle surrounding the urethra, subject to voluntary control. In male anatomy, it is located at the membranous urethra as it passes through the urogenital diaphragm. Its voluntary nature makes it relevant to discussions of urinary continence and pelvic floor exercise. It is distinct from the internal urethral sphincter, which is composed of smooth muscle and not under direct voluntary control. Some pelvic floor exercise programmes specifically target awareness of the external sphincter as part of muscle identification exercises.

Related terms: Levator Ani, Urogenital Diaphragm, Continence

[From Latin: ilium (flank, referring to the ilium bone) + coccyx] One of the three components of the levator ani muscle group. It originates from the tendinous arch of the levator ani along the obturator fascia and inserts at the coccyx and the anococcygeal ligament. It forms the postero-lateral part of the levator ani. In discussions of pelvic floor exercise, it is less frequently mentioned by name than pubococcygeus, but forms part of the broader levator ani group engaged during pelvic floor contractions.

Related terms: Levator Ani, Pubococcygeus, Puborectalis

[From Latin: intra (within) + abdomen] The pressure within the abdominal cavity, generated and regulated by the coordinated action of the respiratory diaphragm, abdominal wall musculature (particularly transversus abdominis), and pelvic floor. IAP rises during activities such as lifting, coughing, sneezing, and high-intensity exertion. The pelvic floor must resist the downward force of elevated IAP while simultaneously supporting the pelvic organs. Management of IAP is a central concept in integrated core training and functional movement frameworks. Impaired pelvic floor function may reduce the capacity to manage IAP spikes effectively.

Related terms: Transversus Abdominis, Pelvic Diaphragm, Diaphragm (Respiratory)

[Named after Arnold Kegel (1894–1981), American gynaecologist] The generic term used in popular and clinical contexts for voluntary contraction exercises of the pelvic floor muscles. In its original description, a Kegel exercise involved deliberate, repeated contractions and releases of the levator ani and perineal muscles, with attention to both the quality of contraction and the completeness of release. The term has since been used broadly across health and fitness literature, sometimes with substantially different technical specifications than Kegel’s original protocol. The term is now commonly used across both female and male contexts, and by practitioners from physiotherapy, sports science, and general fitness backgrounds.

Related terms: Levator Ani, Pubococcygeus, Voluntary Contraction

[From Latin: levare (to lift) + anus] The primary muscle group of the pelvic floor, comprising three components: the pubococcygeus, puborectalis, and iliococcygeus. Together these muscles form a broad, slightly funnel-shaped sheet that spans the pelvic outlet, providing support for the pelvic organs and participating in the control of lower urinary and gastrointestinal function. The levator ani is the primary target of pelvic floor exercises in both clinical and general fitness contexts. Its ability to both contract and fully relax is considered functionally important. The levator ani is innervated by direct branches of the sacral nerve roots (S3–S4) and the pudendal nerve.

Related terms: Pubococcygeus, Puborectalis, Iliococcygeus, Pelvic Diaphragm

[From Sanskrit: mula (root) + bandha (lock, bind)] A term from classical Indian yoga traditions, referring to a perineal contraction or “lock” considered in yoga philosophy to redirect internal energy. In modern yoga practice, interpretations vary: some teachers describe it as an engagement of the perineum, others as a broader internal pelvic and abdominal lift. Its anatomical correspondence to the pelvic floor muscles (particularly the pubococcygeus and perineal body) has been discussed in comparative anatomy literature, though the yoga tradition frames the practice in terms that are not primarily anatomical. The term appears in some contemporary pelvic floor exercise materials, usually in contexts drawing on yoga-adjacent frameworks.

Related terms: Perineum, Levator Ani, Bandha

[From Greek: pelvis (basin) + diaphragma (partition)] The formal anatomical term for the muscular floor of the pelvis, comprising the levator ani and coccygeus muscles together. The term is used interchangeably with “pelvic floor” in much anatomical literature, though “pelvic floor” has become the more commonly used term in clinical and general contexts. The term “pelvic diaphragm” emphasises the functional analogy with the respiratory diaphragm, both being muscular partitions that separate body cavities and both participating in pressure regulation. The term appears primarily in anatomical and physiotherapy literature.

Related terms: Levator Ani, Coccygeus, Diaphragm (Respiratory)

[From Greek: perineos, via Latin perineum] The anatomical region bounded superiorly by the pelvic diaphragm, laterally by the ischial tuberosities, anteriorly by the pubic symphysis, and posteriorly by the coccyx. In clinical anatomy, it is divided into the anterior urogenital triangle and the posterior anal triangle. In common lay and exercise contexts, “perineum” often refers specifically to the perineal body, the central tendinous point between the urogenital and anal triangles, which serves as an attachment point for multiple pelvic floor muscles. The perineum is the area most commonly referenced in simplified instructions for pelvic floor muscle identification.

Related terms: Perineal Body, Levator Ani, Urogenital Diaphragm

[From Latin: pubis + coccyx] The central component of the levator ani, running from the pubic body to the coccyx. It is the most frequently referenced individual muscle in popular pelvic floor exercise literature, often referred to as the “PC muscle” in simplified accounts. Its prominence in general literature reflects its position as the most anterior and easily described component of the levator ani. The pubococcygeus includes several fibre bundles that pass around the urethral and rectal structures, giving it a direct role in the voluntary control of the urethral sphincter. In Kegel’s original descriptions, the pubococcygeus was the primary target muscle.

Related terms: Levator Ani, Puborectalis, Kegel Exercise

[From Latin: pubis + rectum] A sling-shaped muscle forming the medial part of the levator ani, passing behind the anorectal junction to form the anorectal angle. The puborectalis maintains the anorectal angle that supports continence, and its relaxation is necessary for defaecation. It is innervated by the pudendal nerve and direct perineal branches. In the exercise literature, the puborectalis is less frequently discussed separately from the broader levator ani, though its functional role in anorectal mechanics is well established in the colorectal and physiotherapy literature.

Related terms: Levator Ani, Pubococcygeus, Anorectal Angle

[From Latin: os sacrum (sacred bone)] The large triangular bone at the base of the vertebral column, formed by the fusion of five sacral vertebrae and articulating with the ilium on each side to form the sacroiliac joints. The sacrum forms the posterior wall of the bony pelvis. Several pelvic floor muscles, including the coccygeus, attach to the lateral sacrum. The sacrum’s position and mobility are considered in osteopathic and manual therapy frameworks as potentially relevant to pelvic floor function, though this relationship is more contested in the mainstream physiotherapy literature than other aspects of pelvic floor anatomy.

Related terms: Coccyx, Coccygeus, Pelvis

[From Latin: transversus (transverse) + abdomen] The deepest layer of the abdominal wall musculature, with horizontal fibre orientation running from the thoracolumbar fascia, iliac crest, and costal cartilages to the linea alba and pubic crest. In integrated core and pelvic floor frameworks, the transversus abdominis is described as a key co-activator with the pelvic floor and diaphragm, contributing to intra-abdominal pressure regulation and spinal stability. Research by Paul Hodges and others from the 1990s onwards has documented the anticipatory activation of the TVA prior to limb movement, establishing its role as a deep stabilising rather than purely movement-generating muscle.

Related terms: Intra-abdominal Pressure, Diaphragm (Respiratory), Multifidus

[From Latin: urina (urine) + Greek: gonos (generation) + diaphragma] A triangular sheet of fascia and muscle spanning the anterior pelvic outlet, through which the urethra passes in both sexes and through which the vagina also passes in women. In male anatomy, it contains the deep transverse perineal muscle and the external urethral sphincter. The term “urogenital diaphragm” is used variably in anatomical literature; some sources retain it as a distinct anatomical entity, while others describe the structures as part of the deep perineal pouch. In exercise contexts, awareness of the urogenital triangle region is relevant to muscle identification for pelvic floor contractions.

Related terms: Perineum, External Urethral Sphincter, Levator Ani