Lesson 2 ( Embryology)

Lesson 2 (Embryology)

1.Mesonephric(Wolffian) ducts:

a.is present in the female embryo

b.forms the processus vaginalis

c.forms the epoophoron

d.forms the testis

e.does not respond to testosterone unless it is converted to dihydrotestosterone

2.the human oocytes

a.at ovulation is smaller than the human sperm.

b.commences its first meiotic divison at the age of puberty

c.contains a haploid number of chromosomes as a secondary oocyte

d.is connected to surrounding granulosa cells by microvilli

e.develops from the germinal epithelium of ovary

3.the urogenital ridge give rise to

a.the urinary bladder

b.the fallopian tube

c.the ureter

d.the cervix

e.the vulva

4.during embryological development

a.there are four umbilical vessel

b.the inferior parathyroid gland develops from the third pharyngeal pouch

c.the adrenal cortex and medulla develop frpm the mesoderm

d.the physiological umbilical hernia is reduced by the end of the tenth intrauterine week

e.the caudal end of the neural tube closes earlier than the cranial end

5 Structures developing from the mesoderm include

a.spleen

b.liver

c.heart

d.serous membrane

e.the lens of the eye

6.regarding spermatogenesis in the human

a.the whole process take about 70-80 days

b.spermatogonia divide by meiosis

c.the sperm move actively along the seminiferous tubules

d.one spermatogonium give rise to four spermatids

e.the mid piece of the mature sperm is rich in mitochondria

7.in early human development

a.fertilization normally occurs in the ampullary part of fallopian tube

b.implantation occurs 2-3 days post fertilization

c.implantation occurs at stage of blastocyst

d.the second meiotic division of sperm is completed after fertilization

e.the yolk sac develops within the inner cell mass

8.the amniotic fluid

a.is more alkaline than blood

b has increased bilirubin concentration with increased gestation

c.contains glial cells in the presence of open neural tube defects

d.does not contain fibrinogen

e.has increased insulin concentration with increased gestation

9.the vagina :

a.develops partially from urogenital sinus

b.recanalize at 20 weeks post conception

c.may be absent in the presence of ovaries

d.has a pH of 5 in the first few days of life

e.may be completely absent in the presence of uterus

10.in the fetal circulation

a.the ductus arteriosus develops from the left sixth pharyngeal arch artery

b.the ductus venosus carries deoxygenated blood

c.there is high pulmonary vascular resistance

d.there is low placental vascular resistance

e.the pulmonary blood flow is about 25% of cardiac output

discussion date:21/12/2012

venue:L/R segamat