Pelvis Anatomy Flashcards
Boundaries of pelvic inlet
Sacral promontory Ala of sacrum Sacroilliac joint Arcuate line of ileum Pectinal line of pubis Pubic crest Pubic symphysis
Muscles of false pelvis
Psoas
Illiacus
Anterior abdo muscles
Diagonal conjugate
13.5cm
Sacral promontory to underside of pubic symphysis
True obstetric conjugate
11.5 cm
Sacral promontory to closest pnt on pubic symphysis
Shortest AP line in true pelvis
FIXED-Shortest fixed distance that cant move during delivery is the obstertric conjugate
Water underbridge
Ureters pass under uterine artery
Job of s2,3,4 pudendal
Perineum
Sensory to external genitalia
S3,4 supplies levator ani
Extern/inter sphinctors
rectal blood supple
top 1/3- drains to liver via hepatic portal vein
bottom 2/3-drains to systemic via IVC
layers of uterus
peritmetrium
myometrium
endometrium
deep perineal pouch
bw SUPERIOR UROGENITAL FASCIA and PERINEAL MEMBRANE.
Has the transverse perineal muscle and sphintor urethrae in it
superficial perineal pouch
bw PERINEAL MEMBRANE and COLLES FASCIA
bleeding into deep pouch
rupture of membranous/intermediate urethra
fracture of pelvic girdle
bleeding into superficial pouch
rupture of spongy urethra
straddle injury or incorrect catheter insertion
pelvic outlet
tip of coccyx to pubic symphysis
sacrotuberous ligaments
ishcial tuberosities
inferior border of ischiopubic ramus
plane of least dimentions
Anterior-posteriorly, it is from pubic symphysis to S4. Laterally, it is bw the ischial spines
MIDPELVIS/INTERSPINOUS
• the horizontal line bw the ischial spines
12 cm
in birth: shortest is true obstetric
in non pregnant: shrotest is interpinous
