Talk:BGDB Face and Ear - Quiz

From Embryology

Here are a few simple questions that relate to your BGD practical, this page is not a part of today's Practical class. You should try in your own time after completing the Practical today.Take the quiz and see what you know, if you get some wrong, try working through through the .

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1. The adult human upper and lower jaw bones are formed by:

membranous ossification
Reichert's cartilage
Meckel's cartilage
pharyngeal arch neural crest
first pharyngeal membrane
Membranous ossification forms both the upper (maxillary) and lower (mandibular) jaw bones. Meckel's cartilage is a template for the lower jaw formation only, and may remain as a fibrous remnant within the mandible. Reichert's cartilage is from the second arch cartilage and is not a jaw structure. Pharyngeal arch neural crest forms only the cartilage template for the jaw and the first pharyngeal membrane forms the tympanic membrane.

2. The embryonic cartilage that develops in the first pharyngeal arch is derived from:

somite mesoderm
neural crest
unsegmented paraxial mesoderm
lateral plate mesoderm
Neural crest cells migrate into the pharyngeal arches and differentiate into cartilage. In the first pharyngeal arch they form Meckel's cartilage. Cartilage in arch 1, 2 and 3 appear to be neural crest in origin.

3. The allantois, cloaca, hindgut and yolk sac are all lined with endoderm

During week 3 gastrulation generates the endoderm layer that forms an epithelial layer that with later embryonic disc folding lines all of the above structures.

4. The cells in the adult male and female gonad forming from equivalent primordial cells in each sex are:

Sertoli cells and thecal cells
Leydig cells and interstitial cells
primordial germ cells and oocytes
thecal cells and interstitial cells
ductus deferens and mesonephric ducts
Thecal cells (female) and interstitial cells (male) both form the sex hormone secreting cell population in the gonads. Leydig cells and interstitial cells are 2 names for the same cell in the testis. Primordial germ cells exist in both sexes and do form oocytes, but this is not what the question asked. The ductus deferens is the male internal genital tract formed from the mesonephric ducts.

5. Select the correct options below for the embryonic contribution to the female uterus and vagina

Wolffian duct
Utereric duct
Mullerian duct
paramesonephric duct
urogenital sinus
Mullerian and paramesonephric duct are the same thing and the embryonic contributors to the female uterus and vagina development.

6. The relative movement of organs with the peritoneal cavity can best be described as:

descent of the adrenal glands and gonads
ascent of the adrenal glands and genital tubercle
ascent of the kidneys and descent of the gonads
descent of the kidneys and adrenal glands
none of the above
The adrenals, kidneys and gonads are initially closely related. Both the adrenals and kidneys are described as moving relatively as ascending, while the gonads (both ovary and testis) move away in relative descent.

7. The genital tubercle and inner genital folds form the same adult structures in both sexes.

In the fetus, the genital tubercle and genital folds appear as the same external genital structures in both sexes and differentiate to form different adult structures.

8. Select the correct options below describing aspects of gonad development

testis cortical and ovary medullary
ovary cortical and testis medullary
prenatal meiosis in the ovary germ cells
prenatal meiosis in the testis germ cells
prenatal mitosis in the ovary germ cells
Remember the anatomy of the adult gonads, with cortical primordial follicles in the ovary and medullary seminiferous tubules. The primordial germ cells in the testis form diploid spermatogonia that proliferate by mitosis and divide by meiosis postnatally. The primordial germ cells in the ovary form primordial oocytes that proliferate by mitosis and commence meiosis prenatally in the fetal ovary.

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Cite this page: Hill, M.A. 2017 Embryology BGDB Face and Ear - Quiz. Retrieved November 23, 2017, from

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© Dr Mark Hill 2017, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G