Assessment 5 Flashcards
Boundaries of Pelvic inlet: Pelvic Brim
Pubic crest
Pectineal line
Arcuate line
Ala and promontory of sacrum
Boundaries of pelvic outlet
Inferior end of pubic symphysis Ischiopubic ramus Ischial tuberosity Sacrotuberous ligament Tip of coccyx
Pelvis Major
False pelvis, above pelvic aperture
Part of abdominal cavity, abdominal viscera
Lateral: Iliac fossa
Posterior: L5 and S1
Anterior: Abdominal wall
Pelvis Minor
True pelvis, inferior to pelvic inlet
Inferior limit: inferior pelvic aperture/Pelvic brim
Conjugate diameter
Distance between sacral promontory and thickest portion of pubic symphysis
Greater sciatic foramen
Created by greater sciatic notch and sacrospinous ligament
Lesser sciatic foramen
Lesser sciatic notch
Sacrospinous ligament
Sacrotuberous ligament
Anterolateral wall of pelvis
Pubic bones
Portion of ischia
Obturator internus muscle
Lesser sciatic foramina
Posterolateral wall of pelvis
Pelvic surface of sacrum
Grater sciatic foramina
Priformis muscle
Structures originating from posterolateral wall exit…
Greater sciatic foramen
Piriformis muscle
Nerves of lumbosacral plexus
Arteris
Structures originating from anterolateral wall exit…
Lesser sciatic foramen
Obturator internus tendon
Pelvic diaphragm components
Levator ani
Coccygeus
Levator ani components
Pubocorectalis
Pubococcygeus
Iliococcygeus
Pubocorectalis
Puborectal swing, involved with incontinence
Origin of iliococcygeus
Arises from tendinous arch which comes from fascia of obturator internus
Coccygeus origin and insertion
Ischial spine to coccyx
Pelvic diaphragm - male
Urogenital diaphragm
Ureters: 3 constrictions
Ureteropelvic junction
Pelvic brim
Ureterovesical junction (bladder)
Parts of bladder
Detrusor muscle
Internal sphincter
Ureteric orifices
Interureteric fold
Rectosigmoid junction
Level of S3
Rectal ampulla
Dilation superior to pelvic diaphragm - stores feces before expulsion
Anorectal ring - pectinate line
Termination of puborectalis muscle
Blood supply to rectum: 3
Superior rectal artery
Middle rectal artery
Inferior rectal artery
Superior rectal artery origin
IMA
Middle rectal artery origin
Internal iliac artery
Inferior rectal artery origin
Internal pudendal artery
Superior rectal vein drains into..
IMV - portal system
Middle rectal vein drains into..
Internal iliac vein - caval
Inferior rectal vein drains into..
Internal pudendal then internal iliac - caval
Internal/External hemorrhoids
Internal: Dilation of veins of internal rectal plexus
External: Dilation of external veins of rectal plexus
Superior gluteal artery
Passes between lumbosacral trunk and S1
Exits greater sciatic foramen superior to piriformis muscle
Posterior division of male pelvis
Superior gluteal artery
Iliolumbar artery
Lateral sacral artery
Anterior division of male pelvic blood supply
Umbilical artery Obturator Middle rectal Inferior gluteal Internal pudendal Inferior vesical
Endopelvic fascia and spaces (ligaments)
Transverse cervical - cardinal
Uterosacral
Uterovesical
Rectouterine pouch
Adjacent to posterior fornix of vagina
Between vagina and rectum
Corpora cavernosa
Ventral portion of erectile tissue
Deep penile artery central within each tissue mass
Corpus spongiosum
Central tissue, attaches to glans
Crura of penis
Continuation of corpora cavernosa
Covered by ischiocavernosus muscle
Bulb of penis
Expanded portion at base of spongiosum
Covered by bulbospongiosus
Parts of urethra
Spongy
Intermediate (membranous)
Prostatic urethra
Intramural urethra
Parts of vagina
Mons pubis Glans clitoris Labium majus Labium minus Vestibule - space between labia minora
Scrotum female equivalent
Labia majora
Ventral surface of penis female equivalent
Labia minora
Main innervation of perineum
Pudendal nerve and branches:
Inferior rectal
Perineal nerve
Dorsal nerve of penis/clitoris
Perineal nerve branches
Superficial perineal - posterior scrotal/labial
Deep perineal - muscles of superficial and deep pouches
Ilioinguinal nerve
Anterior scrotal/labial
Genitofemoral nerve
Genital branch - overlap anterior scrotal/labial
Inferior cluneal nerve
Inferior buttock and gluteal fold
Path of pudendal nerve
From S2-S4 –> through greater sciatic foramina and lesser sciatic foramina
Superficial perineal pouch boundaries
Superior: Perineal membrane
Inferior: Perineal fascia
Lateral: Ischiopubic rami
Deep perineal pouch boundaries
Superior: Inferior fascia of pelvic diaphragm
Inferior: Perineal membrane
Lateral : Obturator fascia
Epistiotomy
Controlled incision of perineum to aid passage of infant: Median and mediolateral incision
Primordial germ cells
Arise in yolk sack, migrate through umbilical cord to GI tract
Lie in intermediate mesoderm
Epithelial cells proliferate and surround PMG’s –> sex cords
Sex cords: Male and female
Early gonad has both so it is called indifferent gonad
Male sex cords develop first = primary. Located in inner region = medullary sex cords
Female sex cords develop second = secondary. Located in outer region = cortical sex cords
Medullary sex cords + TDF
Pre Sertoli cells –> Sertoli cells
Sertoli cells
Produce Anti Mullerian hormone
Leydig cells
Produce Testosterone when stimulated by LH
Anti mullerian hormone
Produced by Sertoli cells
Degenerate Mullerian duct = no uterus, cervix, superior vagina
Testes determining factor
Encoded by SRY
Female cortical sex cords development
Develop into follicle cells
Testosterone and development
Protect Wolffian duct = vas deferens, epididymis
Female development of Mullerian/Wolffian ducts
No TDF or AMH = no degeneration of Mullerian duct
No testosterone = Degeneration of Wolffian duct
Remodeling of female anatomy: Paramesonephric ducts
Paramesonephric ducts fuse caudally at pelvic urethra and thicken = Uterus, uterine tubes, cervix, fornix, superior vagina
Remodeling of female anatomy: Pelvic urethra
Endoderm, proliferates to form sinovaginal bulb
Elongates to form hymen and inferior portion of vagina
Incomplete fusion of paramesonephric ducts
Uterus bicornis: 2 uterine horns
Uterus didelphys: Double uterus
Uterus didelphys with double vagina
Incomplete formation of urorectal septum
Rectocloacal canal: Common outlet for urethra, vagina, rectum
Rectovaginal fistula: Common outlet for rectum and vagina
Androgen insensitivity sundrome
XY male with mutation of testosterone receptor
Testosterone normal/high –> converted to estrogen
Testes but no sperm, no male accessory organs
Anti mullerian hormone present = no internal female genitalia
Estrogen = female external genitalia, blind ended vagina, breasts
Formation of broad ligament
Fusion of mullerian ducts and break away from mesenchyme
Pouches anterior and posterior to broad ligament
Gubernaculum
Connects ovaries to labia majora, passes behind uterine tubes
When paramesonephric ducts fold, pulled medially
Superior: ovarian ligament
Inferior: round ligament of uterus
Kiss1 neurons
Part of HPG axis
Positive feedbak to GnRH neurons
Sex steroids inhibit Kiss1 = inhibition of GnRH
Excess and minimal GnRH and LH/FSH
Both can cause reduced LH/FSH release
HyperPRL and HPG
Decrease activity of entire axis
HyperTSH and HPG
Can activate FSH
Leptin and HPG axis
Lack of body fat can decrease HPG axis
HPG for males
FSH - sertoli cell function and spermatogenesis
LH - Leydig cell function –> testosterone
Inhibin
Released by sertoli cell, can inhibit FSH
Testicular Androgen binding protein
Need local androgen for spermatogenesis
ABP binds androgens from leydig cell to increase concentration of androgens
Exogenous androgen thus does not help with spermatogenesis
Developmental actions of testosterone
Differentiation of Wolffian ducts (DHT)
Descent of testes
Male brain
Adolescent and testosterone
Secondary sex characteristics: Voice, hair, penis size
Aggression
HP(ovarian) Axis
Requires pulsating GnRH
Developmental actions of estrogen/progesterone
Female sexual differentiation (no need for hormones)
Adolescent and estrogen/progesterone
E: Secondary sex characteristics - ovary/vagina/uterus/breast size increase
Overall process of male gonadal development
Gonads –> penis
Gonad + SRY = Testes
Mullerian ducts + AMH = degeneration
Wolffian ducts + Testosterone = Vas deferens, epidiymis, seminal vesical
DHT androgenizes external male genitalia
Critical in utero time for sex development
7-13 weeks
3 categories of DSD
- Sex chromosome DSD
- 46, XY DSD
- 46, XX DSD
Sex chromosome DSD (3)
- Turners - 45 X
- Klinefelters - 47 XXY
- Mixed gonadal dysgenesis - 45,X/46,XY
46, XY DSD etiology
Disorders of gonadal development
Disorders of androgen synthesis/action
46, XX DSD etiology
Disorders of gonadal development
Androgen excess - maternal and fetal
Palpable gonads in child = ?
Testicles = Y chromosome
Uterus present/absent
Absent = AMH = testicles Present = No AMH = no testes = ovaries/abnormal testes
Normal puberty - males
First and second occurrences
- Testicular enlargement - 11.5yrs
- Pubic/axillary hair
Testicular enlargement before 9 is early
Spermarche
~13.5 yrs
Tanner 3-4 gonads
Growth spurt - males
Later than females
Tanner 3-4
Normal puberty females - first and second sign
- Thelarche - 10.7yrs, can be pubarche though
- Pubarche ~12yrs
Breast development before 8yrs is early
Menarche
Usually 2-2.5yrs after thelarche
Mean age - 12.7
Central precocious puberty
Gonadotropin dependent
Sexual development before: 9 in boys, 8 in girls - testes/breasts
Pubertal levels of FSH/LH
More in females
Central precocious puberty causes
Harmatomas (GnRH)
Pineal masses
Optic glioma
Abcess, encepalitis, trauma
MOST cases idiopathic
How does puberty start?
Mean LH/FSH rise - larger LH rise
Enhanced GnRH episodic secretion
Kiss1 and leptin = positve regulation
Mini puberty
Peak at 2-3 months, gone by 1yr
Males: Elevated testosterone = genitalia, sperm for later
Females: Still not sure, follicle development?
Understand HPG axis
Peripheral puberty
Gonadotropin independent
Estrogen/testosterone elevated but LH/FHS low
Gonadal causes: ovarian tumor, leydig tumor, familial testotoxicosis
Adrenal causes: CAH, tumor
HCG tumor (boys)
Exogenous exposure
Severe hypothyroidism
Precocious puberty (increase in GnRH release)
Spillover effect of TSH on FSH receptor maybe?
McCune Albright Syndrome clinical presentation
Triad of:
- Precocious puberty
- Cafe au lait pigmentation (coast of Maine
- Polyostotic fibrous dysplasia
McCune Albright Syndrome cause
Somatic activating mutation of Galpha protein
Pituitary adenomas with excess LH, FSH, GH, PRL
Bone age
Sex steroids determine ossification within epiphyses
Bone age = True physical development age
Estrogen recetor and aromatase enzyme mutations and bones?
Growth plates don’t fuse, become very tall
Constitutional delay of puberty
Delayed growth spurt but normal pre pubertal growth
Genetic
Bone age will be delayed
Hypogonadotropin hypogonadism
Isolated or part of other pituitary deficiency
Complete pituitary workup, head MRI
Kallman syndrome
Kallman 1 codes anosmin (other genes can be involved)
Gene mutation affect migration of GnRH neurons and creation/migration of olfactory neurons
Hypogonadotropin hypogonadism examples
Functional Anorexia (leptin) Prader-Willi HyperPRL Hypothyroid Cushings
Gonadal failure (boys) - common causes
Testicular failure (high gonadotropins)
Klinefelter syndrome
Mumps orchitis
Trauma/radiation
Vanishing testes
Noonan syndrome
Klinefelter syndrome
47, XXY
Most common cause of gonadal failure
Small testes, talls tature, gynecomastia, developmental delay
Noonan syndrome
Normal karyotype
Short stature, cubitis valgus, triangular fascies, mild MR
Cardiac defects
1/2 have testosterone/sperm production dysfunctions - delayed puberty