Body Pelvis (2) Flashcards
What does the pubis consist of? (3)
- Body
- Superior ramus
- Inferior ramus
Pubis
* Superior ramus
- Contributes to…
- Contributes to the acetabulum
Pubis
* Inferior ramus
- Contributes to…
- Contributes to obturator foramen
What is the shape of the body of the pubis?
- Flat, quadrangular bone
Pubis: Body
___ borders, ___ surfaces
3
3
Pubis: Body
- Lateral border:
- Lateral border:
contributes to obturator
foramen
Pubis: Body
* Inferior border:
- Inferior border:
continuous inferior
ramus
Pubis: Body
* Superior border:
- Superior border: pubic
crest ends pubic
tubercle
Pubis: Body
* Medial surface:
- Medial surface: forms
pubic symphysis,
attached by interpubic
disc (fibro-cartilaginous
joint)
Pubis: Body
* Anterior surface:
- Anterior surface:
directed adductor
compartment (5
muscles)
Pubis: Body
* Posterior surface:
- Posterior surface:
separated from bladder
by retropubic space
Pubis: Superior ramus
* 1/5 of ________
- 1/5 of acetabulum
Pubis: Superior ramus
* _ borders, _ surfaces
3
3
Pubis: Superior ramus
* Anterior border -
- Anterior border - obturator crest
Pubis: Superior ramus
* Inferior border -
- Inferior border - sharp - upper margin of obturator
foramen
Pubis: Superior ramus
* Pectineal/superior surface:
- Pectineal/superior surface – almost triangular
Pubis: Superior ramus
* Posterior surface –
- Posterior surface – lies in relation retropubic space
Pubis: Superior ramus
* Inferior surface –
- Inferior surface – roof for tunnel
- Inferior ramus – _______ ramus
Ischiopubic
Acetabulum
* Cavity –
head of femur
Acetabulum
- ____ joint
Hip
Acetabulum
* Formed by: (3)
ilium, ischium, pubis
Acetabulum
* Space in between =
= acetabular notch – transverse ligament
Acetabulum
- Acetabular _____
fossa
- Acetabular margin
- Acetabular ____
labrum
What are the acetabulum surround?
- Surrounds head of femur
What are the functions of the pelvis? (4)
What is the pelvis separated into? (2)
- Separated into two parts
- False/Greater pelvis
- True/Lesser pelvis
What is the false/greater pelvis?
- Wide upper part of pelvic girdle
- False/Greater pelvis
- Lateral border :
- Lateral border - alae of ilium
- False/Greater pelvis
- Posterior border:
- Posterior border - lower lumbar vertebrae
- False/Greater pelvis
- Anterior border :
- Anterior border - abdominal wall
- True/Lesser pelvis
- Anterior wall -
- Anterior wall - 2 pubic bones with rami
- True/Lesser pelvis
- Lateral wall -
- Lateral wall - ischia with rami and acetabulum
- True/Lesser pelvis
- Posterior wall -
- Posterior wall - sacrum and coccyx
What 3 areas of the pelvis?
- Inlet, cavity and outlet
Pelvis - Inlet
* Formed or bordered by:
- Pubis symphysis
- Pubic crest
- Pubic tubercle
- Pectineal line
- Iliopubic eminence
- Arcuate line
- Ala
- Promontorium
Pelvis - Outlet
* Formed or bordered by: (5)
- Pubic symphysis
- Inferior ramus of pubis and ischium (pubic arch)
- Ischial tuberosity
- Sacrotuberous lig.
- Coccyx
FEMALE vs MALE (9)
Joints of the pelvis
What type of joint is the Pubic Symphysis?
- Cartilaginous joint
Joints of the pelvis:
- Pubic Symphysis
- Bony elements:
2 pubic bones
Joints of the pelvis
* Pubic Symphysis -
* Fibrocartilaginous disc =
= interpubic disc
Joints of the pelvis
* Pubic Symphysis -
Movement =
- Limited movement is possible
Joints of the pelvis
* Sacroiliac joint
What type of joint is this?
- Synovial joint
Joints of the pelvis
* Sacroiliac joint
Ligaments:
- Sacro-iliac ligaments
Joints of the pelvis
* Sacroiliac joint
* Bony elements:
Ala of sacrum + articular surface on ilium
Joints of the pelvis
* Sacroiliac joint
Movement:
- Movement minimal
- Sacrotuberous ligaments
What does it consist of? (2)
- Sacrum and ischial tuberosity
- Sacrospinous ligaments
What does it consist of? (2)
- Sacrum and ischial spine
- Ligaments change the greater and lesser _____ _____ into the foramina
sciatic notches
- Obturator membrane attaches onto…
the obturator foramen
- Anteroinferior pelvic wall
- Bodies & rami:
pubic bones & symphysis
- Anteroinferior pelvic wall
What is the function of this?
- Bears weight of bladder
- Lateral pelvic walls
- Obturator foramen:
- Obturator foramen: obturator membrane
- Lateral pelvic walls
- ______ _______muscle
- ______ fascia
- Obturator internus muscle
- Obturator fascia
- Posterior pelvic wall
- Ligaments:
- Ligaments (ant. sacropelvic, sacrospinous & sacrotuberous)
- Posterior pelvic wall
Muscle:
- Piriformis muscle
What are the muscles of the pelvic floor (pelvic diaphragm)? (2)
- Coccygeus muscle
- Levator ani muscle
- Levator ani muscle
Associated muscles: (3)
- Puborectalis, pubococcygeus & iliococcygeus
Obturator internus
* Origin:
- Pelvic surface ilium,
ischium & obturator
membrane
Obturator internus
* Insertion:
- Greater trochanter
(medial surface)
Obturator internus
* Action:
- Lateral rotation
Obturator internus
* Innervation:
- Nerve to obturator
internus (L5, S1, S2)
Piriformis
* Origin:
- Pelvic surface: S2-S4
segments, sup. margin
greater sciatic notch &
sacrotuberous lig.
Piriformis
* Insertion:
- Greater trochanter
(superior border)
Piriformis
* Action:
- Lateral rotation
Piriformis
* Innervation:
- Ant. rami S1 & S2
Coccygeus
* Origin:
- Ischial spine
Coccygeus
* Insertion:
- Sacrum (inferior end)
and coccyx
Coccygeus
* Action:
- Support pelvic viscera
Coccygeus:
* Innervation:
- Branches: S4 & S5 spinal
nerves
Levator ani (PR, PC, IC): (3)
- Puborectalis (Puborectal sling)
- Pubococygeus
- Iliococcygeus
- Puborectalis (Puborectal sling)
- Body of pubis →
Perineal body & rectum
- Pubococygeus
- Body of pubis →
Anococcygeal lig.
- Iliococcygeus
- Tendinous arch →
Anococcygeal lig.
Levator ani
Action:
- Support pelvic viscera
Levator ani
Innervation:
- Nerve to levator ani, inferior anal nerve & coccygeal plexus