At which week of gestation do the primordial germ cells migrate to form the genital ridges?
third
fourth
fifth
seventh
Correct Answer :
C. fifth
during the fifth week, the genital ridges form at the posterior body wall after primordial germ cells migration from the yolk sac.
Related Questions
The mature genitourinary system develops from all of the following embryonic sources, EXCEPT:
intermediate mesoderm
mesothelium of celomic cavity
endoderm of the urogenital sinus
somatic ectoderm
What causes pink diaper syndrome is (are):
Staphylococcus epidermidis in the urine
dried urate crystals on the diaper
Adenovirus 11 in the urine
Candidiasis in the urine
During fluoroscopy, what is the main source of radiation hazards that urologists could be exposed to?
scattered radiation from the unleaded wall
scattered radiation from the patient
scattered radiation from the floor and ceiling
radiation from the primary beam
Which statement is NOT related to Klinefelter syndrome?
sterility is the rule
has a considerable short life span
treatment requires testicular microdissection and sperm extraction
47 XXY karyotype
Serum testosterone should be measured:
at mid-day
at the hour of sleep
in the morning
late afternoon
By which of the following structures, do the fused lower poles of hoarseshoe kidneys get trapped during embryologic ascent?
inferior mesenteric artery
superior mesenteric artery
celiac artery
common iliac artery
Which statement is false concerning smegma?
it is the white secretion produced under the foreskin in males
it has a crucial role in penile cancer development
it contains lysozymes, chymotrypsin, neutrophil elastase and cytokines
female smegma can be found between the labia
What is the most common cause of hematuria in men over 60 yrs.?
kidney stones
glomerulonephritis
BPH
bladder cancer
At which type of renal tubular acidosis (RTA), typically, potassium levels increase?
type 1
type 2
type 3
type 4
What is the most significant innervation of the vas deferens?
sympathetic nervous system
parasympathetic nervous system
somatic nervous system
none of the above
What does make UTI more common in mid-aged females than in males?
short female urethra
pregnancy
vaginal colonization with enterobacteria
all the above
Bacterial resistance to antibiotics may occur because of:
inherited chromosomal-mediated resistance
acquired chromosomal-mediated resistance
extrachromosomal-mediated resistance
all of the above
What is false concerning coagulase splitting bacteria (Griess) test?
it is a reduction reaction that converts nitrate to nitrite
nitrazine reagent papers are used to elicit the reaction
it is false negative in diluted urine, on taking vitamin C, and in gram +ve bacteria
the reaction takes 4 minutes to complete
Which artery is NOT a branch of the anterior division of internal iliac artery?
superior vesical artery
inferior vesical artery
superior gluteal artery
inferior gluteal artery
Which group(s) of lymph nodes drain(s) the glans penis?
internal and external iliac
superficial inguinal
deep inguinal
superficial and deep inguinal
How can hyperuricosuria cause calcium oxalate calculi?
by increasing oxalate absorption
by heterogeneous nucleation
by inducing hyperoxaluria
by reducing urate crystals saturation
Which zone of the prostate originates from the Wolffian duct tissue:
central zone
peripheral zone
transitional zone
periurethral glands
The commonest neoplasms that metastasize to kidneys come from:
breasts
thyroids
lungs
liver
Which of the following does NOT increase in prostate cancer?
human kallikrein 2
pro-PSA
free PSA
complexed PSA
Where is the centre of reflex erection located at?
the brain cortex
the sacral cord
the lumbar cord
the hypothalamus
What is the nerve supply of the adrenal gland?
sympathetic to the medulla
parasympathetic to the medulla
sympathetic to the cortex
parasympathetic to the cortex
What class of antibiotics might cause vestibular and/or auditory impairment?
aminoglycosides
αantipseudomonal penicillins
cephalosporins
fluoroquinolones
What is the most likely diagnosis of an erectile dysfunction patient with low plasma testosterone and high prolactin levels?
pituitary adenoma
adrenal adenoma
Kallmann syndrome
Klinefelter syndrome
Which of the following carries the greatest risk of HIV transmission to health care workers?
splash of patient`s blood to the eyes
splash of patient`s blood to the mouth
surgical suture needle stick
hollow bore needle stick
Which period of intrauterine life does the process of organ formation (organogenesis) take place?
9 12 weeks
12 15 weeks
15 18 weeks
18 21 weeks
Which of the following conditions could happen in chronic pancreatitis and malabsorption syndrome with steatorrhea?
hyperoxaluria
hypercalciuria
hyperuricosuria
hyperphosphateuria
Which statement is false concerning microhematuria?
malignancy is identified in patients presenting with microhematuria more than in patients presenting with gross hematuria
microscopic hematuria is defined as > 3 red blood cells per high powered field (RBC/hpf) on a single specimen
warrants full hematuria workup
history of cigarette smoking is of significance
Which part of the male urethra is the narrowest?
the membranous
the bladder neck
the bulbous
the external urethral meatus
Which anomaly might accompany horseshoe kidneys?
ureteropelvic junction obstruction
ureterocele
ureteral reflux
ureteral atresia
Which of the following is false regarding zona glomeruloza?
the most superficial layer of the adrenal cortex
responses to increased potassium levels, renin or decreased renal blood flow
it causes pheochromocytoma
secretes aldosterone