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Systems: Reproductive System > Class 3: Perineum > Flashcards

Class 3: Perineum Flashcards

1
Q

Which triangle lies inferior to the pubic symphysis?

A

Urogenital triangle

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2
Q

Which triangle lies anterioinferior to the coccyx?

A

Anal triangle

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3
Q

What is the innervation of the external anal sphincter?

A

Branch of the pudendal nerve

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4
Q

What is the main action of the external anal sphincter ?

A

Constricts the anal canal

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5
Q

What is the innervation of the bulbospongiosus muscle?

A

Deep branch of the perineal nerve (from pudendal)

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6
Q

What is the main action of the bulbospongiosus muscle?

A

Compresses the vestibular bulb and constricts the vaginal orifice

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7
Q

What is the innervation of the ischiocavernosus muscle?

A

Deep branch of the perineal nerve (pudendal)

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8
Q

What is the main action of the ischialcavernosus muscle?

A

Compresses the corpus cavernosum

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9
Q

What is the innervation of the superficial transverse perineal muscle?

A

Deep branch of the perineal nerve (pudendal)

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10
Q

What is the main action of the superficial transverse perineal muscle?

A

Fixes and stabilizes the perineal body/central tendinous point.

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11
Q

What is the innervation of the deep transverse perineal muscle?

A

Deep branch of perineal nerve (from pudendal nerve)

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12
Q

What is the main action of the deep transverse perineal muscle?

A

Fixes and stabilizes perineal body

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13
Q

What is the innervation of the external urethral sphincter?

A

Inferior rectal nerves (from pudendal nerve)

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14
Q

What is the main action of the external urethral sphincter?

A

Compresses urethra to maintain urinary incontinence

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15
Q

What is the perineal body?

A

The space between the anus and scrotum/anus and vulva

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16
Q

What is the clinical significance of the perineal body?

A

Integrity of the pelvic floor - especially in females

17
Q

Which muscles converge towards the perineal body?

A 
External anal sphincter
Superficial transverse perineal muscle
Bulbospongiosus muscle
Levator ani
Deep transverse perineal muscle
18
Q

The external urethral sphincter is found in which of these spaces?

A

Deep perineal pouch

19
Q

Is the external urethral sphincter voluntary or involuntary ? What is its innervation ?

A

Voluntary

Perineal nerve - from pudendal

20
Q

Where is the internal/vesical urethral sphincter located?

A

At the junction of the urethra and the bladder

21
Q

Is the internal urethral sphincter voluntary or involuntary? What is its innervation?

A

Involuntary

S3-4 nerves

22
Q

What are the 3 parts of the male urethra?

A

Prostatic urethra
Membranous urethra
Spongy/penile urethra

23
Q

What is the widest part of the male urethra?

24
Q

What is the narrowest part of the male urethra?

A

Membranous

Systems: Reproductive System (3 decks)

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