lecture 30: pelvis

Question 1

bony pelvis bones

Answer 1

Os Coxae (pelvis bones)
Sacrum
Coccyx
*innominate bones (3 separate bones: the ilium, ischium, and pubis)

Question 2

bones of the pelvis

Answer 2

ileum
pubis
ischium

Question 3

is the sacroiliac joints posterior or anterior

Answer 3

posterior

Question 4

is the pubis symphasis anterior or posterior

Answer 4

anterior

Question 5

the articulation between the os coxae and sacrum is the….

a) pubis symphasis
b) sacroiliac joint
c) lumbosacral joint

Answer 5

B

Question 6

pelvic ligaments

Answer 6

sacrotuberous (ischial tuberosity)
sacrospinous ligament (ischial spine)
posterior sacroiliac ligaments

Question 7

ligaments ____________ excessive movement and ____________ pelvic stability

Answer 7

decrease, increase

Question 8

sciatic foramina

Answer 8

function as passageways for nerves, blood vessels, and muscle tendons
1. greater sciatic foramen
2. lesser sciatic foramen
*formed by sacrotuberous and sacrospinous ligaments

Question 9

the sciatic nerve

Answer 9

• derived from the lumbosacral plexus
• exits pelvis via greater sciatic foramen
• passes inferior to piriformis muscle
  is the longest, largest nerve in body

Question 10

false pelvis contents

Answer 10

female pelvis:
- uterine tubes
- ovaries
- uterus

• superior portion of urinary bladder
• lower intestines

Question 11

false (greater) pelvis borders

Answer 11

above pelvic inlet
posterior border - lumbar vertebrae
lateral borders - upper portions of the ilium
anterior border - abdominal wall

Question 12

true (lesser) pelvis borders

Answer 12

below pelvic inlet
posterior border: sacrum and coccyx
lateral borders: inferior part of ilium and ischium
anterior border: pubic bones

Question 13

lesser pelvis contents

Answer 13

male:
- rectum
- urinary bladder
- seminal glands
- prostate

female:
- cervix
- vagina
- rectum

Question 14

pelvic diaphragm components

Answer 14

• very strong
• piriformis (most posterior)
• coccygeus (2nd most posterior)
• obturator internus (makes up edges)
• levator ani (group of 3 muscles, spans whole length)

Question 15

levator ani

Answer 15

iliococcygeus
pubococcygeus
puborectalis (like a sling - keeps rectum in place)

Question 16

2 openings in the pelvic diaphragm

Answer 16

anal hiatus
urogenital hiatus

Question 17

functions of the pelvic diaphragm

Answer 17

• support the pelvic viscera
• function as sphincters
• resist increases in intra-abdominal pressure

Question 18

compare female and male pelvis

Answer 18

females have a larger and broader pelvis than men

Question 19

local viscera (female)

Answer 19

anterior = symphysis pubis
superior = uterus
vagina = posterior
inferior = pelvic floor/urethra
middle of all = bladder

Question 20

local viscera (male)

Answer 20

anterior = symphysis pubis
superior = urinary bladder and seminal vesicles
posterior = rectum
inferior = pelvic floor
middle of all = prostate

Question 21

does the male or female pelvis have a wider subpubic angle

Answer 21

female