Lecture 16: Pelvic Girdle/Pelvis

Question 1

What are the structural and functional components of the Pelvis?

Answer 1

• structure: complete bony ring formed from 2 hip bones + a sacrum
• function: weight bearing link between legs and axial skeleton, muscle attachment point, protects organs in pelvic cavity

Question 2

Hip bones AKA what? Formed by how many bones?

Answer 2

• coxal bones/os coxae/innominate

- 3 bones

Question 3

Ilium

Answer 3

a) ala & body
b) iliac crest
c) iliac fossa
d) ASIS/AIIS
e) PSIS/PIIS
f) auricular surface
g) tuberosities
h) arcuate line

Question 4

What muscles attach to the ala (“wing”) & body?

Answer 4

glute muscles

Question 5

What attaches to the iliac crest?

Answer 5

thoracolumbar fascia which anchors the lats, QL, glute max, and TFL

Question 6

What does the iliac fossa face?

Answer 6

the pelvic cavity

Question 7

Significant ASIS attachments

Answer 7

inguinal ligament, sartorius, part of TFL, and iliacus

Question 8

What muscle attaches to the AIIS?

Answer 8

rectus femoris

Question 9

What muscle attaches to PSIS/PIIS?

Answer 9

glute med

Question 10

What is significant about the auricular surface of ilium?

Answer 10

it forms the synovial articulation with the sacrum

Question 11

What is significant about the tuberosities on the ilium?

Answer 11

they form the syndesmosis with the sacrum

Question 12

What forms the sacroiliac joint with the sacrum?

Answer 12

the tuberosities and auricular surface on the ilium of hip

Question 13

Arcuate line separates what?

Answer 13

ilium from ischium

Question 14

What is the landmark for pelvic brim?

Answer 14

arcuate line

Question 15

Ischium

Answer 15

a) body
b) ramus of ischium
c) ischial tuberosity
d) ischial spine
e) lesser sciatic notch

Question 16

What part of the hip bone do you sit on?

Answer 16

the ischial tuberosity

Question 17

What ligament attaches to the ischial tuberosity?

Answer 17

sacrotuberous

Question 18

What separates the greater and lesser sciatic notches?

Answer 18

the ischial spine

Question 19

What ligament attaches to the ischial spine?

Answer 19

sacrospinous

Question 20

What muscle attaches to the lesser sciatic notch?

Answer 20

obturator internus

Question 21

Pubis

Answer 21

a) superior ramus
b) inferior ramus
c) body
d) pubic crest
e) pubic tubercle
f) pectin pubis (pectineal line)

Question 22

The inferior ramus of the pubis connects to the ischial ramus to form what?

Answer 22

ischiopubic ramus

Question 23

What ligament attaches to the pubic tubercle?

Answer 23

inguinal ligament

Question 24

The pectineal line is continuous with _________ to form the pelvic brim

Answer 24

arcuate line

Question 25

Composite structures of Hip bone

Answer 25

a) acetabulum
b) obturator foramen
c) greater sciatic notch
d) pelvic brim/inlet
e) pubic arch/subpubic angle
f) pelvic outlet

Question 26

The ilium, ischium, and pubis form the ___________

Answer 26

acetabulum (socket of hip bone for femur)

Question 27

The rami and bodies of pubis and ischium form the ___________

Answer 27

obturator foramen

Question 28

The ilium and ischium form the ________

Answer 28

greater sciatic notch

Question 29

What four landmarks of the hip form the pelvic brim/inlet?

Answer 29

1. sacral promontory
2. arcuate line of ilium
3. pectineal line of pubis
4. crest of pubis

Question 30

The ischiopubic rami of both hip bones form the________

Answer 30

pubic arch/subpubic angle

Question 31

Boundaries of the pelvic outlet

Answer 31

1. R to L: ischial tuberosities

2. Ant to Post: inferior pubic symphysis & coccyx

Question 32

Sexual dimorphism in pelvic structure

Answer 32

• the pelvis is the most sexually dimorphic part of the skeleton
• the female pelvis is shorter and wider to accommodate child development and birth

Question 33

Divisions of pelvis

Answer 33

a) greater (false) pelvis
b) lesser (true) pelvis
c) perineum

Question 34

Greater (false) pelvis

Answer 34

• lies above the pelvic brim

- contains inferior abdominal organs (ilium, sigmoid colon)

Question 35

Lesser (true) pelvis

Answer 35

• lies between pelvic brim and pelvic diaphragm

- contains pelvic organs (urinary bladder/distal ureters; rectum, genital organs)

Question 36

Perineum

Answer 36

not part of the pelvic cavity, but consists of soft tissue below the pelvic diaphragm between the base of the thighs