Lecture 7 - Female genital system - external structures Flashcards
Female External Genitalia/Vulva is located in the
urogenital triangle in the perineum.
the female external genitalia:
mons pubis, labia majora, labia minora, clitoris,
vestibulum of the vagina, the bulbs of the vestibule, greater vestibular glands.
Pudendum
clinically used word.
Female External Genitalia/Vulva function
- as sensory and erectile tissue for sexual arousal and intercourse.
- to direct the flow of urine.
- to prevent entry of foreign material into the urogenital tract.
Mons pubis
- Eminence anterior to pubic symphysis.
- Contains adipose tissue, covered by pubic hair after puberty.
- Continuous with the anterior abdominal wall.
Labia majora
- Prominent folds of skin.
- External parts covered by pubic hair after puberty.
The labia majora passes
inferoposteriorly from the mons pubis towards anus.
What ligament terminates in the labia majora?
Round ligament terminates here
The labia majora joins structures anteriorly and posteriorly:
- Join anteriorly to form the anterior commissure.
- Join posteriorly: posterior commissure (disappears after giving birth).
Pudendal cleft
- Area between the labia majora.
- Contain the labia minora and vestibule.
Labia minora
- Inner folds of hairless skin.
labia minora fucntion
- Surround the vestibule:
opening into which the external urethral & vaginal orifices open.
Labia minora contains
Spongy connective tissue with erectile tissue at their base, many blood vessels.
The labia minora unites anteriorly to form
he frenulum of the clitoris and the prepuce (foreskin) of the clitoris.
The labia minora is connected posteriorly by
frenulum of labia minora (fourchette).
* May disappear when becoming sexually active.
Clitoris is located
where labia minora meet anteriorly.
Clitoris function
- Sexual arousal: composed of erectile tissue.
Clitoris consists of
➢Body: composed of two crura (attached to the inferior pubic ramis & perineal membrane) & two corpora cavernosa: covered by the prepuce.
➢Glans: most innervated part, dense supply of sensory endings.
Vestibule of vagina is the
Space between labia minora.
Vestibule of vagina contains the
orifices of the urethra and vagina.
External urethral orifice:
located 2-3 cm postero- inferior to the glans clitoris and anterior to the vaginal orifice.
Ducts of lesser vestibular glands
(also called Skene’s glands/para-urethral glands)
open on each side of the external urethral orifice.
vestibular glands
Function:
Secretes mucous: moisten labia and vestibule.
Ducts of the greater vestibular glands are located on
medial aspects of labia minora.
Hymen may be present covering the vaginal orifice:
➢ Thin fold of mucous membrane.
➢ Ruptures during sexual intercourse: remnants are called hymenal caruncles.
➢ Demarcate the vagina from the vestibule.
Bulbs of vestibule
Paired erectile tissue on either side of vaginal orifice.
Bulbs of vestibule are found
Deep to the labia minora, immediately inferior to the perineal
membrane.
Bulbs of vestibule are covered by
the bulbospongiosus muscles.
Bulbs of vestibule are homologous with the bulb of the penis
connect the anterior ends of the bulbs of the vestibule to the glans clitoris.
Small bands of erectile tissue
Greater vestibular glands (Bartholin glands) is located
in the superficial perineal pouch/space.
Lie on either side of the vestibule, posterolateral to the vaginal orifice
and inferior to the perineal membrane.
Greater vestibular glands (Bartholin glands) is partly covered by
the bulb of the vestibule and the bulbospongiosus muscle.
Greater vestibular glands (Bartholin glands) open into the
vestibule on each side of the vaginal orifice.
Greater vestibular glands (Bartholin glands) function
Secrete mucous into the vestibule during sexual arousal.
Main arterial supply to the pudendum is the
internal pudendal artery.
What is found within the pudendal canal
Internal pudendal artery, vein and pudendal nerve run within the pudendal canal
What is the pudendal canal
Horizontal passageway within the obturator fascia covering the medial aspect of obturator internus muscle.
Neurovascular bundle enters the pudendal canal at
the lesser sciatic notch, inferior to the ischial spine.
Neurovascular bundle enters the pudendal canal at the lesser sciatic notch, inferior to the ischial spine.
This then gives off
the inferior rectal artery and nerve: passes medially to supply external anal sphincter and surrounding skin.
Towards distal end of the pudendal canal
artery & nerve bifurcates: perineal nerve & artery – distributed to the superficial pouch; & dorsal artery and nerve of clitoris –runs in deep pouch (superior to perineal membrane).
At dorsum of clitoris:
The pudendal nerve runs on lateral side on the continuation of the internal pudendal artery.