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Gross Anatomy > Test 3 muscles of perineum > Flashcards

Test 3 muscles of perineum Flashcards

0
Q

external anal sphincter insertion

A

passes around lateral aspects of anal canal, inserting into perineal body

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1
Q

external anal sphincter origin

A

kin and fascia surrounding anus and coccyx via annococcygeal ligament

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2
Q

external anal sphincter innervation

A

inferior anal nerve, branch of pudendal nerve S2-S4

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3
Q

external anal sphincter action

A
  • constricts anal canal during peristalsis, resisting defication
  • support and fixes perineal body /pelvic floor
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4
Q

bulbospongiosus MALE origin

A

MALE:

median raphe on ventral surface of bulb of penis and perineal body

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5
Q

bulbospongiosus MALE insertion

A

MALE:
surrounds lateral aspects of bulb penis and most proximal part of body of penis, inserting into perineal membrane, dorsal aspect of corpora spongiosum and cavernosa ,and fascia of bulb of penis

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6
Q

bulbospongiosus MALE innervation

A

Male:

muscular (deep) branch of perineal nerve, branch of pudendal nerve S2-S4

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7
Q

bulbospongiosus MALE action

A

MALE

  • supports and fixes perineal body/pelvic floor
  • compresses bulb of penis to expel last drops of urine/ semen
  • assist erection by compressing outflow via deep perineal vein and by pushing blood from bulb into body of penis
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8
Q

bulbospongiosus FEMALE origin

A

Female:

perineal body

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9
Q

bulbospongiosus FEMALE insertion

A

FEMALE:

  • passes on each side of lower vagina, enclosing bulband greater vestibular gland
  • inserts oonto pubic arch and fascia of corpora cavernosa of clitoris
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10
Q

bulbospongiosus FEMALE innervation

A

Female:

muscular (deep) branch of perineal nerve, branch of pudendal nerve S2-S4

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11
Q

bulbospongiosus FEMALE action

A

Female:

  • supports and fixes perineal body/pelvic floor
  • sphincter of vagina
  • assists in erection of clitoris (and bulb of vestibule)
  • compresses greater vestibular gland
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12
Q

ischiocavernosus origin

A

internal surface of ischiopubic ramus and ischial tuberosity

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13
Q

ischiocavernosus insertion

A

embraces crus of penis or clitoris inserting onto inferiorand medial aspects of crus and perineal membrane medial to crus

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14
Q

ischiocavernosus innervation

A

muscular (deep) branch of perinealnerv,branch of prudendal nerve

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15
Q

ischiocavernosus action

A

maintains erection of penis or clitoris by compressing outflow veins and pushing blood from root of penis or clitoris into body

16
Q

superficial transverse perineal origin

A
  • internal surface of ischiopubic ramus and ischial tuberosity
  • compressor urethra portion only
17
Q

superficial transverse perineal insertion

A

passes along superior posterior border of perineal membrane to perineal body

18
Q

superficial transverse perineal innervation

A
  • muscula (deep) branch of perineal nerve, branch of pudendal nerve(S2-S4)
  • dorsal nerve of penis or clitoris, terminal branch of pudendal nerve (S2-S4)
19
Q

superficial transverse perineal action

A

support and fix perineal body (pelvic floor) to support abdominopelvic viscera nd resist intra-abdominal pressure

20
Q

deep transverse perineal origin

A
  • internal surface of ischiopubic ramus and ischial tuberosity
  • compressor urethra portion only
21
Q

deep transverse perineal insertion

A
  • passes along superior posterior border of perineal membrane to perineal body
  • and external anal sphincter
22
Q

deep transverse perineal inervation

A
  • muscula (deep) branch of perineal nerve, branch of pudendal nerve(S2-S4)
  • dorsal nerve of penis or clitoris, terminal branch of pudendal nerve (S2-S4)
23
Q

deep transverse perineal action

A

-support and fix perineal body (pelvic floor) to support abdominopelvic viscera nd resist intra-abdominal pressure

24
Q

external urethral sphincter origin

A
  • internal surface of ischiopubic ramus and ischial tuberosity
  • compressor urethra portion only
25
Q

external urethral sphincter insertion

A

-surrounds urethra superior to perineal membrane

MALE:also ascends to anterior aspect of prostate

FEMALE:some fibers also enclose vagina(urethrovaginal sphincter)

26
Q

external urethral sphincter innervation

A
  • muscula (deep) branch of perineal nerve, branch of pudendal nerve(S2-S4)
  • dorsal nerve of penis or clitoris, terminal branch of pudendal nerve (S2-S4)
27
Q

external urethral sphincter action

A

-compress urethra to maintain urinary continence

only
-FEMALE:urethrovginal sphincter portion alsocompresses vagina

Gross Anatomy (20 decks)

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