Pelvis Flashcards
Boundaries of Pelvic Inlet/Pelvic Brim
anterior: SYMPHYSIS PUBIS
lateral: ILIOPECTINEAL LINE
posterior: SACRAL PROMONTORY
Boundaries of Pelvic Outlet
anterior: PUBIC ARCH
lateral: ISCHIAL TUBEROSITIES
posterior: TIP OF COCCYX
ABOVE the pelvic brim
FALSE pelvis
GREATER pelvis
pelvis MAJOR
BELOW the pelvic brim
TRUE pelvis
LESSER pelvis
pelvis MINOR
From SACRAL PROMONTORY to the SUPERIOR margin of the pubic symphysis
True Conjugate (~11 cm)
From SACRAL PROMONTORY to a point few millimeters from the top of pubic symphysis
The shortest pelvic diameter through which the fetal head must pass during birth
Obstetric Conjugate (~10.5 cm)
From SACRAL PROMONTORY to the INFERIOR margin of the pubic symphysis
Measured during obstetric examination
Diagonal Conjugate (>11.5 cm)
Type of pelvis which is flattened antero-posteriorly
Platypelloid
Separates the greater and lesser sciatic foramen
ISCHIAL SPINE
Provides an EXIT from the pelvis into the gluteal region
pelvic to gluteal
GREATER Sciatic Foramen
Provides an ENTRANCE into the perineum from the gluteal region
gluteal to perineum
LESSER Sciatic Foramen
Exit Greater Sciatic Foramen and Enter Lesser Sciatic Foramen
PIANO
Pudendal nerve
Internal Pudendal a/v
Nerve to obturator internus
Urogenital Diaphragm
Sphincter urethrae
Deep Transverse Perineal
Pelvic Diaphragm
LEVATOR ANI - Puborectalis, Pubococcygeus and Iliococcygeus
COCCYGEUS
Muscles most often TORN during CHILDBIRTH
Puborectalis
Pubococcygeus
Fibromuscular mass that marks the point of convergence of the bulbospongiosus muscle, external anal sphincter and transverse perineal muscle
Perineal body
FEMALE PELVIS
thin and light OVAL shaped - pelvic inlet DIAMOND shaped - pelvic outlet EVERTED ischial tuberosities SHALLOW major (false) pelvic cavity WIDE and SHALLOW minor (true) pelvic cavity WIDE greater sciatic notch SHORT, WIDE, FLAT sacrum TRIANGULAR obturator foramen
Boundaries of Perineum
anterior - symphysis pubis
inferior - tip of coccyx
lateral - ischiopubic and sacrotuberous ligament
Muscles that maintain penile contraction
ischiocavernosus
bulbospongiosus
Secretions are ejected because of the rhythmic contractions of this muscle
bulbospongiosus
CONTENTS of the Ischioanal Fossae
fats
PUDENDAL CANAL - pudendal nerve and internal pudendal vessels
INFERIOR RECTAL NERVES AND VESSELS
Contents of the SUPERFICIAL perineal space
MALES ROOTS of penis superficial perineal muscle bulbospongiosus ischiocavernosus perineal body perineal branch of pudendal nerve
FEMALES ROOTS of clitoris superficial perineal muscle bulbospongiosus ischiocavernosus perineal body perineal branch of pudendal nerve GREATER VESTIBULAR GLANDS
Contents of the DEEP perineal space
MALES BULBOURETHRAL GLAND internal pudendal vessels membranous urethra dorsal nerve of the penis sphincter urethra muscle deep transverse perineal muscle
FEMALES part of urethra part of vagina internal pudendal vessels dorsal nerve of the clitoris sphincter urethra muscle deep transverse perineal muscle
