Anus and Anal Canal

Question 0

Lower opening of anal canal

Answer 0

Anus

Question 1

Anal triangle is bounded behind by

Answer 1

Coccyx

Question 2

Anus: Nerve supply of the surrounding skin

Answer 2

Inferior rectal (hemorrhoidal) nerve

Question 3

Anus: lymph drainage

Answer 3

Superficial inguinal LN

Question 4

Part of the anus wherein the epithelium is thrown into folds

Answer 4

Anal verge (anocutaneous line)

Question 5

Part of anal canal without skin appendages

Answer 5

Anoderm

Question 6

The anal canal

Is divided into upper half and lower half by

Answer 6

Dentate/pectinate line

Question 7

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

Answer 7

B. Anatomic anal canal

Question 8

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

Answer 8

A. Surgical anal canal

Question 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

Answer 9

A. Upper half

Question 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

Answer 10

A. Upper half

Question 11

Anal canal:

• mucous membranes is derived from ECTODERM
• LE: Stratified squamous
• NO anal columns

A. Upper half
B. Lower half

Answer 11

B. Lower half

Question 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

Answer 12

B. Lower half

Question 13

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

Answer 13

Hilton’s white line / intersphincteric line

Question 14

Located between the Hilton’s line and Dentate line

Answer 14

Pecten

Question 15

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

Answer 15

Superficial part

• subcutaneous and deep part: no bony attachment

Question 16

Varicosities of SUPERIOR rectal veins

Answer 16

INTERNAL hemorrhoids

Question 17

Varicosities of INFERIOR rectal veins

Answer 17

EXTERNAL hemorrhoids

Question 18

Abscess formed in the glands of the anal crypts

Answer 18

Perianal abscess

• intersphincteric
• ischiorectal
• horseshoe
• pelvirectal (supralevator)

Question 19

Result of spread or inadequate treatment of anal abscesses

Answer 19

Fistula in Ano

• interaphincteric
• transsphincteric
• supralevator
• extrasphincteric

Question 20

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

Answer 20

Superior Rectal (Periatrial) & Hypogastric Plexus

Question 21

Structure that attaches the external anal sphincter to the perineal body

Answer 21

Anococcygeal ligament

Question 22

Longitudinal ridges on superior half of mucous membrane of anal canal

Answer 22

Anal columns

Question 23

Small recesses found superior to the valves

Answer 23

Anal sinuses

Question 24

Anal canal: blood supply

Answer 24

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

Question 25

Anal canal: venous drainage

Answer 25

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

Question 26

Superior rectal vein is a branch of

Answer 26

IMV

Question 27

Anal canal: Lymph drainage

Answer 27

Supe: Pararectal nodes Infe: superficial inguinal nodea

Question 28

Anal canal: Innervation

Answer 28

Supe: inferior hypogastric plexus - sensi ONLY to stretch Infe: Somatic inferior rectal nerves - sensi to pain, touch, temp

Question 29

Somatic inferior rectal nerve is a branch of

Answer 29

Pudendal nerve