Structure of pelvis

Question 1

what makes the pelvic inlet

Answer 1

sacral promontory
ala of sacrum
iliopectileal line ( arcuate and pectileal line)
superior border of pubic symphysis

Question 2

what makes the pelvic outlet

Answer 2

pubic symphysis 
right and left rami of the pubic arch 
ischial tuberosities
sacrotuberous ligament
coccyx

Question 3

true pelvis

Answer 3

area between pelvic inlet and pelvic outlet

Question 4

false pelvis

Answer 4

area above the pelvic inlet

Question 5

differences in males and females with the pelvis

Answer 5

female: 
oval inlet
rounder outlet
shallower pelvis 
wider pubic arch

making it broader for child birth

Question 6

Structures of pelvic wall A/P/ L

Answer 6

anterior: pubic symphysis
posterior: sacrum coccyx, pyriformis
lateral: coxal bone below pelvic rim, obturator membrane, sacrospinatus, sacrotuberous ligaments, obturator interns
floor: pelvic diaphragm

Question 7

what does pelvic diaphragm separate

Answer 7

the true pelvic cavity into: the pelvis and perineum

Question 8

components of pelvic diaphragm

Answer 8

coccygeus
levator ani muscles
- iliococcygeous
-pubococcygeous
-puborectalis

Question 9

pubococcygeous ( M/F)

Answer 9

from pubis to median raphe:
M: forms levator prostate,
F: forms pubovaginalism

Question 10

puborectalis

Answer 10

makes a u shaped sling around rectum

assists in taking pressure off rectum when there is poop

Question 11

functions of elevator ani muscles

Answer 11

resists intra abdominal pressure
suports pelvic viscera
Raises to assist abdominal muscles to compress pelvic and abdominal organs when pooping peeing vomiting coughing and giving birth

Question 12

innervation of elevator ani

Answer 12

s3-s5

Question 13

innervation of coccygeus

Answer 13

s4-s5

Question 14

boundaries of perineum

Answer 14

pubic symphysis, R L rami of pubic arch, ischial tuberosities, sacrotuberous ligament, coccyx

Question 15

perineum is divided into what

Answer 15

UG triangle

anal triangle

Question 16

boundaries of anal triangle (a/p/m/l/s/i)

Answer 16

a: posterior border of UG diaphragm
p: sacrotuberous ligaments
Lateral: obturator muscle and ischial tuberosity
medial: levator ani and internal anal sphincter muscles
superior: levator ani
inferior: skin

Question 17

contents of anal triangle

Answer 17

ischiorectal fat pad
alcocks canal
inferior rectal vessels
inferior rectal nerve ( from pudental N()

Question 18

alcocks canal

Answer 18

pudental canal,

contains pudental nerve and vessels

Question 19

internal anal sphincter composed of

Answer 19

circular smooth muscle

under involuntary control

Question 20

external anal sphincter: components

Answer 20

subcutaneous: no attachments
superficial: attached to central perineal tendon and median raphe ( coccyx)
deep: no attachments