Female Reproductive tract Flashcards
vulva
external female genitalia
vulva functions
sensory tissue during sexual intercourse
assists in micturition by directing flow of urine
protects internal female reproductive tract from infection
structures of vulva
mons pubis labia majora lbia minora vestibule Bartholin's glands clitoris
mons pubis
subcutaneous fat pad located anterior to pubic symphysis
Formed by fusion of labia majora
labia majora
two hair-bearing external skin folds
extend from mons pubis posteriorly to posterior commissure
Embryologically derived from labioscrotal swellings
labia minor
hails folds of skin, lie within labia major.
fuse anteriorly to form hood of clitoris and extend posteriorly either side of vaginal opening
merge posteriorly- creating fold of skin: fourchette
embryologically derived from urethral folds
vestibule
area enclosed by labia minora
contains openings of vagina and urethra
Bartholin’s glands
secrete lubricating mucus from small ducts during sexual arousal
located either side of vaginal orifice
clitoris
located under clitoral hood
formed of erectile corpora cavernous tissue, becomes engorged with blood during sexual stimulation
embryologically derived from genital tubercle
Vascular supply of vulva
paired internal and external pudendal arteries
branches of internal iliac artery and femoral artery
Venous drainage of vulva
pudendal veins
Lymph drainage of vuvla
drains to nearby superficial inguinal lymph nodes
innervation of vulva
sensory and parasympathetic
Sensory
- Anterior: ilioinguinal nerve (branch of genitofemoral)
- Posterior: pudendal nerve
Clitoris and vestibule also receive parasympathetic innervation from cavernous nerves
vagina
distensible muscular tube which extends posterosuperiorly from external vaginal orifice to cervix
roles of vagina
Sexual intercourse
Childbirth
Menstruation
anatomical position of vagina
anterior: bladder & urethra
Posterior: rectouterine pouch, rectum and anal canal
lateral: ureters and levator ani muscle
anatomical structure of vagina
fibromuscular tube with anterior and posterior walls
Upper ending: vagina surrounds cervix, creating 2 fornices
Role of vaginal fornix
Posterior fornix acts as natural reservoir for semen after intravaginal ejaculation.
Semen retained in fornix liquefies in 20-30 minutes, allowing for easier permeation through cervical canal
histology of vagina
Stratified squamous epithelium
- provides protection and is lubricated by cervical mucus
Elastic lamina propria
- dense connective tissue layer which projects papillae into overlying epithelium
Fibromuscular layer
-comprises of 2 layers of smooth muscle; inner circular and outer longitudinal
Adventitia
- fibrous layer
- provides additional strength to vagina whilst also binding it to surround structures.
arterial supply of vagina
uterine and vaginal arteries
both branches of internal iliac artery
venous return of vagina
vaginal venous plexus
-drains into internal iliac veins via uterine vein
Lymphatic drainage of vagina
Superior: external iliac nodes
Middle: internal iliac nodes
Inferior: superficial inguinal lymph nodes
innervation of vagina
predominantly from autonomic nervous system
parasympathetic and sympathetic nerves arise from uterovaginal nerve plexus
Only inferior 1/5 of vagina receives somatic innervation via branch of pudendal nerve- deep perineal nerve
vaginal fistulae
open communication between vagina and one of the adjacent pelvic organs
main types of vaginal fistulae
vesicovaginal
- communication with bladder. urine enters vagina
urethrovaginal
- communication with urethra. urine enters vagina during urination
rectovaginal
- communication with rectum. faecal matter can enter vagina