Gross Anatomy Pelvis Notes

INTRODUCTION TO PELVIS

 Subdivided to greater + lesser pelvis


 Greater - false pelvis (protects abdominal viscera)
 Lesser - true pelvis (contains pelvic viscera) + separated from perineum by pelvic
diaphragm


Bones of Pelvic Girdle


 Pelvic bones


 Sacrum


 Triangular-shaped bone
 Location: base vertebral column
 Forms post wall of pelvic cavity
 5 fused sacral vertebrae
 Rough post + smooth ant


Ant parts


 Base - articulates sup with L5 + associated IVDs
 Apex - articulates inf with coccyx
 Sacral promontory - ant projection that occurs sup + forms post margin of pelvic
inlet
 Ala of sacrum - large triangular surface on either side of sacral base, cont with
iliac fossa
 Transverse lines - remnants of fused sacral IVDs

,Post parts


 Median sacral crest - formed by fusion of SPs of individual sacral vertebrae
 Intermediate sacral crests - formed by fusion of sacral articular processes of
individual sacral vertebrae
 Lat sacral crests - formed by fusion of TVPs of individual sacral vertebrae
 Auricular surfaces - ear-shaped articular surfaces located lat on sacrum




Boundaries Of Pelvis


Pelvic inlet / pelvic brim / sup pelvic aperture


 (boundary between greater and lesser pelvis or entry into pelvic cavity)


Boundaries include

,  Sacral promontory
 Ala of sacrum
 Arcuate line of ilium
 Pectineal line + sup pubic ramus + pubic crest
 Sup border of pubic symphysis



Pelvic outlet / inf pelvic aperture


 (boundary between lesser pelvis + perineum or exit of pelvic cavity)


Boundaries include


 Pubic arch ant
 Ischial tuberosities lat
 Sacro tuberous ligament
 Coccyx




Sexual Differences of Pelvis


Male


 General structure - thick + heavy
 Greater pelvis - deep