Repro Pathophys: Puberty and Repro-age Flashcards
SRY
male gonadal development master regulator
Y chromosome
SOX9
male gonadal development TF
interacts with SRY
suppressed by genes of X chromosome when SRY is absent
Wolffian ducts
male repro embryology
forms male duct system (epididymis, vas deferens, seminal vesicles)
testosterone production by leydig cells contributes to Wolffian duct formation
sertoli cells
male repro
produce antimullerian hormone (AMH) to prevent formation of female mullerian duct system
Mullerian ducts
female repro embryology
forms Fallopian tubes, uterus, cervix, and upper vagina
default, in absence of AMH or androgens
5-alpha-reductase
male development & embryo
converts testosterone to more potent dihydrotestosterone
essential for complete masculinization of male external genitalia
anosmia and delayed puberty
absence of smell
points to GnRH issue
GnRH neurons migrate from olfactory placed during development
therefore abnormal migration of GnRH neurons also tends to accompany abnormal olfactory development
puberty of infancy
normal “mini-puberty” due to reduction in placental inhibition of GnRH
females: estradiol monthly cycling + gradual (non-cyclic) decline in FSH and LH after initial spike ~1 mo
males: breast development and genital enlargement, testosterone curve peaks around 6 weeks and then gradually declines to very low levels by about 6 mo
FSH and LH targets in male
LH - leydig cells - testosterone production
FSH - Sertoli cells - AMH production and nutritional etc. support of sperm development
timing of lab workup for abnormal puberty
morning ~8am
LH is released overnight
initiation of puberty male
release of inhibition of hypothalamic GnRH pulse generator
(constant low-level GnRH suppresses FSH and LH, while pulsatile GnRH activates)
following increase in pulsatile GnRH production, pituitary and gonadal sensitivity also increases creating acceleration
testicular enlargement is the first observed sign
normal pubertal window male
9-14 y/o onset (testes stage G2, ~4cc)
14-18 y/o testes reach full size (G5, 15-25cc)
timing mainly genetic
height: 10.5-16 onset, 13-17.5 end
penis: 11-14.5 onset, 13.5-17 end
pubic hair coincides with testes usually
strength: ~15-16
very rare to see any changes past age 20
tanner stages male
G(gonadal)1 - prepubertal
G2
- testicular enlargement (~4cc)
- sparse, fine, straight pubic hair
- no penile enlargement
G3
- continued testicular enlargement
- long, dark, curly pubes around mons only
- penile length, no girth change
G4
- continued testicular and penile enlargement (length and girth)
- pubic hair thick but not yet spread to thighs
G5- mature (
- testes ~15-25cc
- flaccid penis ~3.5 in (2-6, 2.5-97.5 percentile)
- stretched penis ~5 in (4.3-6.5)
- erect penis ~6 in (4.5-7.5)
- pubic hair thick, inverted triangle distribution with spread to thighs
note that right testis is generally slightly bigger than left
orchidometer
measures testicular size (approx)
pubarche
appearance of body hair and odor
d/t adrenarche - androgen precursors from *adrenal gland
separate process from puberty but normally occurs around same time
epithelia of endocervix
simple columnar
mucus producing
mucus is responsive to estrogen and changes throughout cycle
epithelia of ectocervix
stratified squamous
SCJ (transitional zone)
squamous-to-columnar junction of cervix
prone to metaplasia
important to sample during PAP
layers of uterus
endometrium - functional layer sheds during menstruation - basal layer myometrium perimetrium
cells of inner mucosal lining of fallopian tube
ciliated and nonciliated secretory epithelial cells
4 segments of fallopian tube
interstitial
- junction w/ uterus
isthmus
- straight segment close to uterus
ampula
- most of tube, after isthmus)
infundibulum
- with fimbriae
layers of fallopian tube
mucosa (inner)
muscular
serosa (outer)
epithelia of vagina
stratified squamous
significance of glycogen in vagina
supports lactobacillus in microbiota
pre-puberty and post-menopause there is less glycogen and therefore less colonization
granulosa cell
aka follicular cell
proliferate and hypertrophy to surround developing oocyte
secrete progesterone after ovulation
respond to FSH
theca cell
secrete androgens in ovary, which are later converted to estrogens in the granulosa cell
crosstalk with granulose cell
squamous, surround granulosa cells
respond to LH
primordial follicle
single layer of granulosa cells
primary follicle
several layers of granulosa cells
compact around oocyte
no liquid filled regions
secondary follicle
more layers of granulosa cells than primary
liquid filled regions begin to appear
first meiotic division completed
arrest at this stage
graffian follicle
aka tertiary
mature, liquid filled
rupture to release egg
second meiotic division starts
atretic follicle
degenerated follicle
apoptosis prior to follicle maturity
common pre-puberty and repro age (the oocytes that do not continue to develop each cycle)
in excess can be sign of pathology
atresia occurs when follicles are not stimulate by FSH
thelarche
breast development in female
tanner stages female
1- prepubertal
2
- breast budding
- areolar enlargement
- some coarse, pigmented hair along labia majora
3
- breast and areola enlargement
- spread of pubes over mons pubis
4
- continued breast enlargement
- secondary mound of areola
- near adult pubes
5
- mature breast contour
- adult pube distribution
normal pubertal window female
first sign usually breast development
average age 10.5, range 8-12 onset
stops 14.5 (11.5-18)
menarche 12.5 (10-16.5)
0.5 yr after peak growth spurt
2-2.5 yr after thelarche
height and pubic hair (usually) lags slightly behind breast development
pubarche first sign in ~15%
thelarche age black (~9.5) < Mexican < white (~10.5)
early menarche pattern
irregular cycles for 3-5 years (90% have >10 periods/yr after 3 years)
initially irregular, anovulatory q21-45 days
onset of puberty mechanism
similar in male and female
release of brake on pulsatile hypothalamic GnRH
primary signal is unknown other than genetic influence
- kisspeptin and neurokinin B activation are involved
- leptin, sufficient adipose needed (and obesity is associated with early puberty)
- CNS pubertal clock
- trending earlier
FSH and LH targets female
FSH
- granulosa cell
- makes estrogens (which support endometrium proliferation)
- granulosa cell proliferation
- otherwise atresia
LH
- theca cell
- makes androgens
- stimulates estrogen/progesterone production in granulosa cell
- LH spike (due to estrogen levels crossing a threshold from negative to positive feedback) induces ovulation
estradiol in menstrual cycle
produced by pre-ovulatory follicle peaks ~24 h prior to ovulation when estradiol levels reach critical concentration, there is a switch from negative to positive feedback on LH causes LH surge that causes ovulation ovulation ~24-36 h after LH surge
ovulation induction
estradiol produced by pre-ovulatory follicle reaches critical concentration, switches from negative to positive feedback on LH
~24 h later, LH surge occurs
~24-36 h after that, ovulation occurs (caused by LH)
LH surge
- resumption of meiosis 1 of primary oocyte
- synthesis of prostaglandins –> follicle rupture
- luteinization of granulosa cells –> progesterone production
luteal phase
- after LH surge/ovulation
- granulosa and theca cells luteinize to form corpus luteum
- corpus luteum produces estrogen and progesterone
- – negative feedback on LH/FSH –> no new follicular growth
- – secretory changes of functional endometrium in support of pregnancy (arteries, glycoproteins, edema)
- corpus luteum loses function after 9-11 days if not rescued by hCG
normal menstrual cycle duration and ovulation
q21-35 days (60% 25-28 days)
if regular, almost always ovulatory (except PCOS)
anovolation common in setting of irregular menses
timing of luteal phase (~14 days) is more consistent than follicular phase (where most of variability in cycle length comes from)
- period will almost always occur ~14 days after ovulation
normal menopause window
average 51.5
considered premature if <40
dx if no menses for 1 year
ovulation predictors
- basal body temp (rough)
- kits: LH surge, ± estrogen
- luteal phase progesterone
- cervical mucous changes
when to investigate primary amenorrhea
- age 15-16 if normal growth and secondary characteristics
- age 13 in absence of secondary characteristics or height <3%ile
- age 12-13 if + breast dev and + cyclic pelvic pain
- within 2 years of breast development
when to investigate secondary amenorrhea
- 3 months if previously regular periods
- 6 months if previously irregular periods
- likelihood of pregnancy
- hx of intermenstrual intervals >35 days