Perineal Anatomy Flashcards by Emma Moulton | Brainscape

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Know IDs in green and what they branch to in yellow

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Q

area contained within labia minora

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vestibule

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structures found within vestibule

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external urethral orifice

vaginal orifice

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boundaries of UG triangle

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pubic symphysis, ischeal tuberosities

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innervation and function of bulbospongious

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fx: maintain erection (F/M), ejaculation (M)
innervation: perineal n. (deep branch); S2,3,4

para-pre, symp pre/post

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innervation and function of ischeocavernosus

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fx: maintain erection (F/M), ejaculation (M)
innervation: perineal n. (deep br.); S2,3,4

para-pre, symp pre/post

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innervation and function of superficial transverse perineus

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fx: support perineal body
innervation: perineal n. (deep br.)

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perineal body fx

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central stabilizing point of perineum

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bulb of vestibule fx, innervation

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fx: erection, sensation, forms glans of clitoris
innervation: cavernous nerves (uterovaginal and vesical plexi)

para post

homologous to bulb of the penis

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crura of corpora cavernosa fx, innervation

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fx: maintain erection, sensation
innervation: cavernous nerves (uterovaginal and vesical plexi)

parasympathetic

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body of clitoris fx, innervation

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fx: sensation, erection
innervation: cavernous nerves (uterovaginal and vesicular plexi)

Q

glans of clitoris is formed by tissue of which erectile body?

A

bulb of the vestibule

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greater vestibular glands fx, homology

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fx: secrete mucus into vestibule during sexual arousal
homology: bulbourethral glands

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perineal membrane is superior boundary of ___ pouch and inferior boundary of ___ pouch

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superior boundary of deep pouch (below it)

inferior boundary of superficial perineal pouch (above it)

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muscles of UG diaphragm

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sphincter urethrae

deep transverse perineus

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fx of muscle of UG diaphragm

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sphincter urethrae: control exit of urine

deep transverse perineus: support pelvic floor, ejaculation (M)

Q

contents of ischioanal fossa

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adipose, inferior rectal vessels and nerves

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pudental nerve branches

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inferior rectal n.s (SA, SE)
perineal n.

–> superficial br –> posterior scrotal (M) or posterior labial n.s

–> deep br –> UG triangle muscles

dorsal n. of clitoris (F) or penis (M)

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pudental nerve origin

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sacral plexus

S2,3,4

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course pudental n.

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thru greater sciatic foramen –> lesser sciatic foramen –> pudental canal –> perineum

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internal pudendal a. branches

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inferior rectal a.s

perineal a.

posterior labial a.s / posterior scrotal a.s

a. to the bulb

deep a. of clitoris / penis

dorsal a. of clitoris / penis

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internal pudendal a. origin

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internal iliac a.

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internal pudendal v. tributary to…

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internal iliac v.

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dartos reflex

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temperature sensitive wrinkling of the skin, shrinking

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external spermatic fascia corresponds to which abd wall layer

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ext. abd. oblique aponeurosis

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cremaster reflex

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elevate testis upward for warmth and protection

can be induced by gently stroking internal thigh

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cremaster fascia corresponds to which abd wall layer

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int. abd. oblique

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epididymus fx

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conduct sperm from testis to vas deferens

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erectile bodies comprising body of penis

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corpora cavernosa

corpus spongiosum

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erectile body forming glans of penis

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corpus spongiosum

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inguinal triangle boundaries

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lateral edge of rectus abdominis

medial half of inguinal ligament

position of inferior epigastric vessels

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superficial inguinal ring transmits … in M and … in F

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spermatic cord (M)

round ligament (F)

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walls, floor, roof of inguinal canal

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anterior wall: abdominal oblique aponeurosis

posterior wall: transversalis fascia

roof: internal abdominal oblique and transversus abdominus m.s
floor: inguinal ligament

Q

conjoint tendon is formed by aponeurosis of which two layers

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fusion of aponeuroses of int abd oblique and transverse abdominis

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inguinal ligament forms which boundary of inguinal canal

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floor

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deep inguinal ring is formed in which layer

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transfersalis fascia (makes up posterior wall)

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attachments round ligament

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gubernaculum and uterus

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landmarks of perineum

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coccyx

ischeal tuberositis

pubic symphysis

Q

muscles comprising pelvic diaphragm

A

levator ani

coccygeus

Q

greater sciatic foramen connects which 2 regions

A

pelvic cavity to gluteal region

Q

lesser sciatic foramen connects which 2 regions

A

gluteal region to perineum region