Pelvis Osteology Flashcards
(17 cards)
Front
“Back”
Bones forming the pelvic girdle
“2 hip bones (innominate bones), 1 sacrum, 1 coccyx”
Components of a single hip bone
“Ilium, ischium, pubis (fuse at acetabulum)”
Landmark: ASIS
“Anterior Superior Iliac Spine (attachment for sartorius, inguinal ligament)”
Landmark: PSIS
“Posterior Superior Iliac Spine (level of S2, dimples visible on back)”
Landmark: Ischial tuberosity
“Weight-bearing bone when sitting; hamstrings attach here”
Landmark: Pubic symphysis
“Fibrocartilage joint; widens during pregnancy”
True vs. False pelvis
“True: Below pelvic brim (birth canal). False: Above brim (abdominal cavity)”
Pelvic inlet boundaries
“Sacral promontory, arcuate line, pecten pubis, pubic symphysis”
Pelvic outlet boundaries
“Pubic arch, ischial tuberosities, sacrotuberous ligaments, coccyx”
Gender differences (Male vs. Female pelvis)
“Female: Wider subpubic angle (>90°), oval inlet, shorter sacrum”
Obturator foramen contents
“Obturator nerve/vessels (exception: obturator artery may branch from inferior epigastric)”
Greater sciatic foramen structures
“Piriformis, sciatic nerve, superior gluteal vessels/nerves”
Sacrotuberous ligament attachment
“Sacrum → Ischial tuberosity (stabilizes sacroiliac joint)”
Sacrospinous ligament attachment
“Sacrum → Ischial spine (creates lesser sciatic foramen)”
Clinical: Hip fracture common site
“Femoral neck (intracapsular) or intertrochanteric (extracapsular)”
Clinical: Pelvic fracture (open book)
Anterior-posterior compression → pubic symphysis diastasis
