Group 16: Muscles of the perineum

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Last updated 3:10 PM on 9/18/26
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25 Terms

1
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Muscle #1 Superficial transverse

perineal

supports pelvic floor

<p>supports pelvic floor</p>
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Superficial transverse

perineal origin

Origin: ischial tuberosity

<p>Origin: ischial tuberosity</p>
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Superficial transverse

perineal insertion

Insertion: perineal body of perineum

<p>Insertion: perineal body of perineum</p>
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Superficial transverse

perineal action

Action: stabilizes perineal body of perineum

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Superficial transverse

perineal innervation

Innervation: perineal branch of pudendal nerve of the sacral plexus

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Muscle #2 Bulbospongiousus

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Bulbospongiousus origin

Origin: perineal body

<p>Origin: perineal body</p>
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Bulbospongiousus insertion

Insertion: Perineal membrane of deep muscles of perineum, deep fascia on dorsum of penis in male; pubic arch and root and dorsum of clitoris in female

<p>Insertion: Perineal membrane of deep muscles of perineum, deep fascia on dorsum of penis in male; pubic arch and root and dorsum of clitoris in female</p>
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Bulbospongiousus action

Action: helps expel urine during urination, helps propel semen along urethra, assists in erection of the penis in male; constricts vaginal orifice and assists erection of clitoris in female

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Bulbospongiousus innervation

Innervation: perineal branch of pudendal nerve of the sacral plexus

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Muscle #3 Ischiocavernosus

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Ischiocavernosus origin

Origin: ischial tuberosity and ischial and pubic rami

<p>Origin: ischial tuberosity and ischial and pubic rami</p>
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Ischiocavernosus insertion

Insertion: corpus cavernosum and crus of the penis/clitoris

<p>Insertion: corpus cavernosum and crus of the penis/clitoris</p>
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Ischiocavernosus action

Action: maintains erection by squeezing blood into corpus cavernosum

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Ischiocavernosus innervation

Innervation: perineal branch of pudendal nerve of the sacral plexus

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Muscle #4 Deep transverse perineal

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Deep transverse perineal origin

Origin: ischial ramus

<p>Origin: ischial ramus</p>
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Deep transverse perineal insertion

Insertion: perineal body and external anal sphincter

<p>Insertion: perineal body and external anal sphincter</p>
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Deep transverse perineal action

Action: helps expel last drops of urine and semen in males and urine in females

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Deep transverse perineal innervation

Innervation: perineal branch of pudendal nerve of the sacral plexus

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Muscle #5 External urethral sphincter

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External urethral sphincter origin

Origin: ischial and pubic rami

<p>Origin: ischial and pubic rami</p>
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External urethral sphincter insertion

Insertion: Median raphe in male and vaginal wall in female

<p>Insertion: Median raphe in male and vaginal wall in female</p>
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External urethral sphincter action

Action: helps expel last drops of urine and semen in males and urine in females

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External urethral sphincter innervation

Innervation: sacral spinal nerve S4 and inferior rectal branch of the pudendal nerve