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Anatomy Module 5 > Anus and Anal Canal > Flashcards

Anus and Anal Canal Flashcards

0
Q

Lower opening of anal canal

A

Anus

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1
Q

Anal triangle is bounded behind by

A

Coccyx

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2
Q

Anus: Nerve supply of the surrounding skin

A

Inferior rectal (hemorrhoidal) nerve

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3
Q

Anus: lymph drainage

A

Superficial inguinal LN

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4
Q

Part of the anus wherein the epithelium is thrown into folds

A

Anal verge (anocutaneous line)

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5
Q

Part of anal canal without skin appendages

A

Anoderm

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6
Q

The anal canal

Is divided into upper half and lower half by

A

Dentate/pectinate line

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7
Q

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

A

B. Anatomic anal canal

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8
Q

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

A

A. Surgical anal canal

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9
Q

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

A. Upper half

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10
Q

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

A. Upper half

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11
Q

Anal canal:

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

A. Upper half
B. Lower half

A

B. Lower half

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12
Q

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

A

B. Lower half

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13
Q

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

A

Hilton’s white line / intersphincteric line

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14
Q

Located between the Hilton’s line and Dentate line

A

Pecten

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15
Q

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

A

Superficial part

  • subcutaneous and deep part: no bony attachment
16
Q

Varicosities of SUPERIOR rectal veins

A

INTERNAL hemorrhoids

17
Q

Varicosities of INFERIOR rectal veins

A

EXTERNAL hemorrhoids

18
Q

Abscess formed in the glands of the anal crypts

A

Perianal abscess

  • intersphincteric
  • ischiorectal
  • horseshoe
  • pelvirectal (supralevator)
19
Q

Result of spread or inadequate treatment of anal abscesses

A

Fistula in Ano

  • interaphincteric
  • transsphincteric
  • supralevator
  • extrasphincteric
20
Q

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

A

Superior Rectal (Periatrial) & Hypogastric Plexus

21
Q

Structure that attaches the external anal sphincter to the perineal body

A

Anococcygeal ligament

22
Q

Longitudinal ridges on superior half of mucous membrane of anal canal

A

Anal columns

23
Q

Small recesses found superior to the valves

A

Anal sinuses

24
Q

Anal canal: blood supply

A

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

25
Q

Anal canal: venous drainage

A

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
Q

Superior rectal vein is a branch of

A

IMV

27
Q

Anal canal: Lymph drainage

A

Supe: Pararectal nodes
Infe: superficial inguinal nodea

28
Q

Anal canal: Innervation

A

Supe: inferior hypogastric plexus
- sensi ONLY to stretch

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

29
Q

Somatic inferior rectal nerve is a branch of

A

Pudendal nerve

Anatomy Module 5 (11 decks)

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