Anatomy Of The Bony Pelvis Flashcards
(37 cards)
What are the main functions of the bony pelvis?
- support of upper body when standing/sitting
- transfer weight from spine to femurs to stand/walk
- attachments of abdominal muscles and muscles of locomotion
- external genitalia attachment
- protection of pelvic organs/ vessels
- passage for childbirth
What bones are included in the bony pelvis?
- 2 hip bones (ilium/ischium/pubis)
- sacrum
- coccyx
What bone is part of the bony pelvis that is not included in the pelvic girdle?
Coccyx
What are the main bony landmarks of the ilium?
- iliac crest
- iliac fossa (where illiacus muscle attaches)
- Anterior Superior and Inferior iliac spines
- Posterior Superior and Inferior iliac spines
What are the main bony landmarks of the ischium?
- Ischiopubic Ramus (where the two bones join)
- Ischial tuberosity (bony bit that you are sitting on)
- Ischial spine (attachment of hamstring muscles)
What bony landmarks can be found on the pubis?
- ischiopubic ramus
- pubic arch and sub pubic angle
- superior pubic ramus
- Pubic tubercle (where superior pubic rami join)
Which is more superior, the pelvic inlet or outlet?
Pelvic inlet
What bones make up the pelvic inlet and line the pelvic brim?
- sacral promontory (sticks forward => prominent)
- ilium
- superior pubic ramus
- pubic symphysis
What bones make up the pelvic outlet?
Ischiopubic ramus Pubic symphysis Ischial tuberosities Sacrotuberous ligaments Coccyx
(Imagine as an oval shape around these structures)
Where is the true pelvic cavity found?
Between the pelvic inlet and pelvic floor
What is considered the “false pelvis”?
The tops of ilium bone on each side are in the “greater/false” pelvis and not included in the “lesser/true” pelvis
The pelvic cavity is continuous with the abdominal cavity. TRUE/FALSE?
TRUE
What surface landmarks of the pelvis can you palpated externally?
Anterior:
- Iliac crest
- ASIS
- Pubic tubercle
- Pubic symphysis (on deep palpation)
Posterior:
- iliac crest
- Posterior superior iliac spine (PSIS)
- Ischial tuberosity
- Coccyx
Where does the inguinal ligament attach to the ilium and pubis?
Between ASIS and pubic tubercle
Name 3 joints found in the pelvis
Hip joint
Sacroiliac joint
Pubic symphysis
What type of joint is the hip joint?
Synovial (for movement)
What type of joint is the pubic symphysis?
Secondary cartilaginous
What type of joint is the sacroiliac joint?
Anterior part = synovial
Posterior part = syndemoses => fibrous
What is the function of the large number of ligaments found in the pelvis?
Ligaments are stretched across a joint to aid in stabilisation
Where does the sacrotuberous ligament attach?
Sacrum to Ischial tuberosity
Where does the sacrospinous ligament attach?
From sacrum to Ischial spine
What are the main functions of the sacrotuberous and sacrospinous ligaments?
- Stop the inferior sacrum moving forward and superiorly when weight is suddenly transferred through the spine
- form the greater and lesser sciatic foramen
The pelvic ligaments are stiff during pregnancy. TRUE/FALSE?
FALSE - they relax during pregnancy
What covers most of the obturator foramen?
Obturator membrane
- does not cover superior aspect where the obturator canal is
