Pelvis Flashcards
Bony Pelvis
Ilium, ischium & pubis
sacrum
coccyx
joined by pubic symphysis ant
sacro iliac joint post
Sacrum and coccyx
Joints & Ligaments
Sacroiliac joint
- ant- synovial
- post- syndesmosis
Pubic Symphysis
- secondary cartilaginous
Lumbosacral joint
- IV joint foremd by L5/S1
Sacrococcygeal joint
Sacroilial Joint
Sacrum sinks into pelvis
Symphysis pubic
Synchondrosis
Obturator Membrane
Pubic Arch
Different for men and women
Statics of Pelvis
Sacrum suspended in pelvic ring by many ligaments
Motion is restricted by balanced T of these ligaments
Pelvic Cavity
Enclosed by bony, ligamentous & muscular wall
Contains urinary bladder, ureters, pelvic genital organs, rectum, blood vessles, lymphatics & nerves
Pelvic Inlet (sup pelvic aperature)
Pelvic outlet (inf pelvic aperature)
Greater/false & Lesser/true Pelvis
Superior Pelivc Aperature
Horizontal line the longets
Inferior Pelvic Aperature
Inferior Pelvic Border
Pelvic Diameters
Size of lesser pelvis important in obstetrics since fetus passes through there in vaginal birth
Use diagonal conjugate by palpating sacral promontory with tip of mid finger
Pelvic Axis- pelvic inclination
Pelvic axis= imaginary curved line that passes through centers of various anteropost diameters of pelvis
pelvic inclination= incilination of pelvis the angle between the plane of pelvic inlet & horizontal plane
Pelvic Variations
Pelvic Injuries
Fracture of all four pubic rami (head on collision)
Fracture of acetabulum (sky diving)
Spondylolysis- Spondylolisthesis
Low back pain in adolescent
Stress fracture in one of vert- spondylolysis L5 or L4 (less common)
Spondylolisthesis- when bone so weak that unable to maintain proper position & vert shift out of place
Walls
Ant- by bodies & rami of pubic bones & pubic symphysis
Lat- hip bones & obturator internus m.
Post- sacrum & coccyx, adj ilia & SI joint, piriform m. covers A. Pudendal n. goes through pudendal canal (splitting obturator fascia)
