Anatomy 2: Pelvic Floor and Blood Vessels

Question 1

Function of the piriformis muscle

Answer 1

Strong lateral rotator of the thigh

Question 2

Origin of the piriformis muscle

Answer 2

Anterior surface of the sacrum, just lateral to the sacral foramina of S2, S3, and S4 vertebrae

Question 3

Where does the piriformis muscle leave the pelvis

Answer 3

Greater sciatic foramen

Question 4

Name the 4 muscles of the pelvic floor from this saggital section

Answer 4

• Piriformis
• Obturator internus
• Coccygeus
• Levator ani

Question 5

Name the 4 pelvic floor muscles from this superior view

Answer 5

• Piriformis
• Coccygeus
• Obturator internus
• Levator ani – iliococcygeus

Question 6

Name the 4 pelvic floor muscles from this superior view

Answer 6

• Coccygeus
• Levator ani - iliococcygeus
• Levator ani - pubococygeus
• Levator ani - puborectalis

Question 7

Label these parts (female)

Answer 7

• Cervix
• Urethra
• Pubic symphysis
• Levator ani
• Tendinous arch
• Rectum

Question 8

4 arteries that enter the true pelvis

Answer 8

• Median sacral artery
• Internal iliac artery
• Ovarian aa.
• Superior rectal a. (via the inferior mesenteric a.)

Question 9

Label these 12 pelvic arteries (female)

Answer 9

See image

Question 10

Label these 11 pelvic arteries (male)

Answer 10

See image

Question 11

5 pelvic veins that exit the true pelvis

Answer 11

• Internal iliac vein
• Median sacral vein
• Right gonadal vein
• Left gonadal vein (via the left renal vein)
• Superior rectal vein (to the IMV to the splenic vein)

Question 12

Label these 6 pelvic veins

Answer 12

See image