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Flashcards in export_perineum i Deck (27):
1

Anal triangle

Posterior
Anal canal and paired ischioanal fossae

2

Urogenital triangle

Anterior
Male - penis, scrotum, testes, epididymis

Female - vulva, mons pubis, labia majora, labia minora, vestibule, vaginal orifice, clitoris

3

Upper half of anal canal - derivation

Hindgut endoderm

4

Upper half of anal canal - innervation

Autonomic nerves

5

Upper half of anal canal - Arteries

Superior rectal (off IMA) and middle rectal (off internal iliac)

6

Upper half of anal canal - Veins

Superior rectal (drains into IMV)

7

Upper half of anal canal - Lymphatic flow

To the inferior mesenteric lymph nodes

8

Lower half of the anal canal - Derivation

Ectoderm of proctodeum (future anal pit)

9

Lower half of the anal canal - Innervation

Somatic (inferior rectal branch of pudendal n.)

10

Lower half of the anal canal - Arteries

Inferior rectal (internal pudendal)

11

Lower half of the anal canal - Veins

Inferior rectal (draining into internal pudendal)

12

Lower half of the anal canal - Lymphatic flow

Drain into superficial inguinal nodes

13

External anal sphincter Innervation

Innervated by inferior rectal n. (from pudendal n.)

14

Ischiorectal Fossa

Fat-filled spaces lateral to anal canal

15

Ischiorectal fossa boundaries

Obturator internus muscle - lateral wall of pelvis
Levator ani - part of pelvic diaphragm

Skin, sacrotuberous/sacrospinous ligaments, deep transverse perineal muscles

16

Where is the pudendal canal contained?

Ischiorectal fossa

17

Pudendal canal location

On lateral wall of fossa
In the fascia of obturator internus m.

18

Pudendal canal contents

Pudendal n.
Internal pudendal a.

Internal pudendal v.

n. to obturator internus

19

Pudendal n.

S2-S4
Gives off inferior rectal n., dorsal n. for penis or clitoris, and perineal n.

20

Internal pudendal a.

Off internal iliac a.
Inferior rectal a. and branches to penis or clitoris/labia

21

Internal pudendal v.

Tributaries correspond to arteries

22

Superficial fascia (fatty layer) of UG triangle

Camper's fascia in the abdomen
Continuous with ischiorectal fat

23

Superficial fascia (fatty layer) of UG triangle - males

Diminished amount of fat
Fat disappears in scrotum and penis - replaced by dartos muscle

24

Superficial fascia (fatty layer) of UG triangle - females

Makes up substance of fat in the mons pubis and labia majora

25

Superficial fascia (membranous layer) of UG triangle

"Colles fascia"
Scarpa's fascia in the abdomen

26

Superficial fascia (membranous layer) of UG triangle - males

Attached to the scrotums Dartos muscle
Forms tubular sheath around penis - superficial penile fascia

27

Superficial fascia (membranous layer) of UG triangle - females

Forms tubular sheath around clitoris (clitoral fascia)