Outline 12: the pelvis Flashcards
How many bones make up the pelvis
3
what are the bones that make up the pelvis
2 os coxae and 1 sacrum
the body of the sacrum articulates with what
L5
what is the sacral iliac joint
the line where the sacrum meet the os coxae
compare and contrast the pelvic and pectoral girdle
the pelvic girdle compromises mobility for stability
the pectoral girdle compromises stability for mobility
what is the acetabulum
it is the socket for the hip joint
the acetabulum is analogous to what structure
the glenoid fossa (socket for the humerus)
what three bones contribute to the acetabulum
ilium
ischium
pubis
What bone is most superior in the pelvis
the ilium
what part of the ilium contributes to the acetabulum
the body
What has 3 gluteal lines on the posterior side
the ala
what is the top of the ala
the iliac crest
what is on the anterior superior end of the iliac crest
ASIS
what is on the posterior inferior end of the iliac crest
PSIS
what marks the beginning of the greater sciatic notch
PIIS
what is inferior to ASIS anteriorly
AIIS
what marks the connection between the ala and the body, where the angle of the ilium changes
the arcuate line
what marks the top of the superior pubic ramus. This like extends medially towards the pubic tubercle
pecten
what marks the lateral boundary of the pelvic inlet
linea terminalis (iliopectineal line= arcuate line + pecten)
What part of the ischium contributes to the acetabulum
the body
what is the medial projection of the ischial ramus
Ischial spine
what is the inferior terminus of the ischial ramus
ischial tuberosity
what demarcates the boundary between the greater sciatic notch and the lesser sciatic notch
the ischial spine
what contributes to the acetabulum in the pubis
the superior ramus
Does the body of one pubis meet the body of the second at any point? If so, where?
Yes; at the pubic symphysis
what is the top of the body of the pubis
the pubic crest
what is the boundary between the body and the superior ramus of the pubis
the tubercle of the pubis
Which structure meets the ischium at the ischial tuberosity?
Inferior pubic ramus
what meets anteriorly at the pubic symphysis
os coxae
the os coxae articulate posteriorly with ______
sacrum
The obturator foramen is between which two bones?
Between pubis and ischium
what is the obturator foramen covered by
the obturator membrane
The small opening in the Obturator membrane is called (X). What travels through it?
X = Obturator canal
obturator nerves and vessels run through
the ASIS is horizontally in the same plane as the ______
PSIS
the ASIS is vertically in the same plane as _______
pubic tubercle
What marks the upper border of the pelvis
the pelvic brim/aperture/inlet
what is the lateral border of the pelvic inlet
iliopectineal line
what is the posterior border of the pelvic inlet
sacral promontory
what is the anterior border of the pelvic inlet
top of pubis
where is pelvis major and why is it “false pelvis”
it is between the ala of the ilium and above the pelvic inlet. So it is actually in the abdomen
what is the anterior border of pelvis major
abdominal wall
what is the lateral border of pelvis major
iliac fossae
what is posterior border of pelvis major
L5 and S1
what is the true pelvis
pelvis minor
what is the superior border of Pelvis Minor
pelvic inlet
what Is the inferior border of pelvis minor
pelvic diaphragm
what is the posterior border of pelvis minor
sacrum and coccyx
what is the anterior border of pelvis minor
pubis
what is the lateral border of pelvis minor
obturator internus
what are the contents of pelvis minor
bladder, rectum, urinary ducts, prostate, ovaries, uterus, vagina
where is the pelvic diaphragm suspended
inferior pelvic aperture/ pelvic outlet
what is the external surface of the pelvic outlet
perineum
what does the perineum contain
external genitilia
what is on the outside of the obturator membrane
obturator internus
name 3 ways the female pelvis is different from the male pelvis
wider pubic arch with shallower subpubic angle
larger pelvic inlet
thinner bone in iliac fossae
what are the two joints in the vertebral column (in the pelvic area)
L5:sacrum
sacrum:coccyx
what kind of joint(s) is/are found between L5:sacrum
Anterior: symphysis between the bodies
Posterior: plane between the arches
what kind of joint(s) is/are found between the sacrum:coccyx
only symphysis joints (because the arches and the bodies of the sacrum are fused)
Which ligaments are like a continuation of the Anterior Longitudinal Ligament and Posterior Longitudinal Ligament? They act to:
Sacrococcygeal ligaments; reinforce the vertebrae/sacrum/coccyx
How many pelvic joints are there? Name them
3 total
(1) pubic symphysis
(2) sacro-iliac joints
The pubic symphysis joint is (anterior/posterior), between which bones?
anterior; the two os coxae
what two ligaments reinforce the pubic symphysis joints?
superior pubic ligament
arcruate pubic ligament
what does the superior pubic ligament connect
pubic tubercles
what do the arcuate pubic ligaments connect
os coxae
the sacro-iliac joints are (anterior/posterior) and come between which bones
posterior; os coxae and the sacrum
list the things that contribute to the stability of the sacro-iliac joints
the irregularities on the sacrum surface
the wedge shape of the sacrum
ligaments
what kind of joint is the sacro-iliac joint
plane joint (diarthrosis covered by hyaline cartilage)
what two ligaments reinforce the joint capsule of the sacro-iliac joint
ventral/anterior Sacroilial ligaments
posterior sacroiliac ligaments
What is the strongest ligament
interosseous Sacroiliac ligament
where are the interosseous sacroiliac ligaments?
?????????
BETWEEN THE BONES OF THE OS COXAE AND SACRUM BUT WHERE EXACTLY AND WHY ISNT THIS PART OF THE JOINT CAPSULE???
what prevents lumbar vertebrae from sliding forward on the sacrum
iliolumbar ligaments
what does the iliolumbar ligament connect
ilia to the transverse processes of L5
what does the sacrotuberous ligaments connect
posterior sacrum to ischial tuberosity
what do the sacrospinous ligaments connect
anterior sacrum to ischial spine
what demarcates the greater and lesser sciatic notches
the ischial spine
What (enter(s)/exit(s)) the pelvis through the greater (Y)?
Sacral plexus nerves; exit pelvis; Y = sciatic foramen
The lesser (X) serves as an (entry into/exit out of) the pelvis for…
X = sciatic foramen; entry into pelvis; pudendal nerve and nerve to obturator internis
