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END 207: Anatomy > Perineum Int. & ischeo-rectal fossa > Flashcards

Perineum Int. & ischeo-rectal fossa Flashcards

1
Q

Boundaries of Perineum

A

Anterior:
* Symphysis pubis
* Inferior pubic ligament
* Ischial tuberosities

Posterior: Coccyx

Lateral: Ischeopubic rami

Posterolateral: Sarcotuberous ligament

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2
Q

Perineum is divided into:

A
  • Anal triangle posterioly
  • Urogenital triangle anteriorly
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3
Q

Contents of anal triangle

A
  • Anal canal
  • 2 ischeorectal fossae, 1 on each side of the anal canal
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4
Q

Contents of urogenital triangle

A
  • External genitalia
  • Superficial & deep perineal pouches
  • perineal membrane
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5
Q

shape of ischo-rectal fossa

A

wedge shaped fossa (apex, base & 4 walls)

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6
Q

Apex of ischo-rectal fossa is formed by

A

levator ani

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7
Q

Base of ischo-rectal fossa is formed by

A

Fascia and skin

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8
Q

Medial wall of ischo-rectal fossa is formed by

A

Upper 2/3: (sloping edge) Levator ani
Lower 1/3: (vertical edge) external anal sphincter

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9
Q

Lateral wall of ischo-rectal fossa is formed by

A
  • Obturator internus & its fascia
  • its fascia forms pudendal canal enclosing pudendal nerves & internal pudendal vessels
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10
Q

Anterior wall of ischo-rectal fossa is formed by

A
  • all Perineal muscles (superficial, deep & transverse)
  • Perineal membrane
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11
Q

Posterior wall of ischo-rectal fossa

A

Sacrotuberous ligament overlapped by gluteus maximus

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12
Q

Enumerate contents of Ischorectal fossa

A
  1. Semi liquid fat
  2. Inferior rectal vessels
  3. Inferior rectal Nerve
  4. Perineal Artery
  5. Posterior scrotal N 🚹/ Labial N 🚺
  6. Perineal branch of S4
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13
Q

Course of inferior rectal vessels in ischorectal fossa

A
  1. Arise from internal pudendal A
  2. Cross fossa from Lateral to medial to reach anal canal
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14
Q

Course of inferior rectal N in ischorectal fossa

A

same as Inferior rectal vessels, cross fossa from laterial to medial

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15
Q

Course of perineal Artery

A
  1. Arises from Internal Pudendal A anterior end
  2. peirces medial wall of pudendal canal
  3. enters ischiorectal fossa
  4. pierces perineal membrane to enter superfical perineal pouch
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16
Q

origin of Posterior scrotal N 🚹/ Labial N 🚺

A

Perineal Nerve

17
Q

Inferior rectal Nerve supplies:

A
  • External anal sphincter
  • Levator ani
  • Skin around anus
18
Q

Course of perineal br. of S4 N

A

Pierces coccygeus to enter ischiorectal fossa from posterior

19
Q

perineal br. of S4 N supplies:

A
  • external anal sphincter
  • levator ani

END 207: Anatomy (15 decks)

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