Anus and Anal Canal Flashcards Preview

Anatomy Module 5 > Anus and Anal Canal > Flashcards

Flashcards in Anus and Anal Canal Deck (30):
0

Anal triangle is bounded behind by

Coccyx

1

Lower opening of anal canal

Anus

2

Anus: Nerve supply of the surrounding skin

Inferior rectal (hemorrhoidal) nerve

3

Anus: lymph drainage

Superficial inguinal LN

4

Part of the anus wherein the epithelium is thrown into folds

Anal verge (anocutaneous line)

5

Part of anal canal without skin appendages

Anoderm

6

The anal canal
Is divided into upper half and lower half by

Dentate/pectinate line

7

Located inferior to the dentate line
A. Surgical anal canal
B. Anatomic anal canal

B. Anatomic anal canal

8

Located inferior to the anorectal line
A. Surgical anal canal
B. Anatomic anal canal

A. Surgical anal canal

9

What part of the anal canal can you see the following:
Anal columns of Morgagni
Anal valves of Morgagni
Anal valves

A. Upper half
B. Lower half

A. Upper half

10

Anal canal:
- mucous membrane is derived from HINDGUT of ectoderm
- LE: columnar epitheliun
- thrown into folds

A. Upper half
B. Lower half

A. Upper half
B. Lower half

A. Upper half

11

Anal canal:
- mucous membranes is derived from ECTODERM
- LE: Stratified squamous
- NO anal columns

A. Upper half
B. Lower half

B. Lower half

12

In what part of the anal canal can you see the following:
- Hilton's white line
- Pecten
- Pectinate line

A. Upper half
B. Lower half

B. Lower half

13

Located between the internal and external anal sphincter - more palpable than visible

Hilton's white line / intersphincteric line

14

Located between the Hilton's line and Dentate line

Pecten

15

Part of the external anal sphincter that is attached to coccyx and perineal body

Superficial part

- subcutaneous and deep part: no bony attachment

16

Varicosities of SUPERIOR rectal veins

INTERNAL hemorrhoids

17

Varicosities of INFERIOR rectal veins

EXTERNAL hemorrhoids

18

Abscess formed in the glands of the anal crypts

Perianal abscess
- intersphincteric
- ischiorectal
- horseshoe
- pelvirectal (supralevator)

19

Result of spread or inadequate treatment of anal abscesses

Fistula in Ano
- interaphincteric
- transsphincteric
- supralevator
- extrasphincteric

20

Contraction o the internal anal sphincter is controlled and maintained by SYMPA fibers from

Superior Rectal (Periatrial) & Hypogastric Plexus

21

Structure that attaches the external anal sphincter to the perineal body

Anococcygeal ligament

22

Longitudinal ridges on superior half of mucous membrane of anal canal

Anal columns

23

Small recesses found superior to the valves

Anal sinuses

24

Anal canal: blood supply

Superior rectal a
Inferior rectal a (2): inferior to PL, surrounding muscle, perianal skin
Middle rectal a - anastomose

25

Anal canal: venous drainage

Internal rectal venous plexus then to:
Supe rectal v - Portal system
Infe rectal v - caval venous system
Middle rectal v - muscularis externa of ampulla

26

Superior rectal vein is a branch of

IMV

27

Anal canal: Lymph drainage

Supe: Pararectal nodes
Infe: superficial inguinal nodea

28

Anal canal: Innervation

Supe: inferior hypogastric plexus
- sensi ONLY to stretch

Infe: Somatic inferior rectal nerves
- sensi to pain, touch, temp

29

Somatic inferior rectal nerve is a branch of

Pudendal nerve