This set of Human Anatomy Multiple Choice Questions & Answers (MCQs) focuses on “Embryology – Notochord”.
1. Which type of tissue gives rise to notochord?
a) Mesoderm
b) Endoderm
c) Ectoderm
d) Ovum
View Answer
Explanation: Mesoderm gives rise to the notochord. Mesoderm is one of the primary germ layer.
2. The segmented blocks of tissue that develop on each side of notochord are called as _______
a) Somites
b) Neural tube
c) Neural crest
d) Adrenal medulla
View Answer
Explanation: Somites are bilaterally paired blocks of paraxial mesoderm that forms along the head to tail axis of the developing embryo in segmented animals.
3. The first truly vertebrate development is marked by the formation of ________
a) Notochord
b) Neural crest
c) Primitive streak
d) Coccyx
View Answer
Explanation: Neural crest cells are temporary group of cells unique to vertebrates that arise from embryonic ectoderm cell layer.
4. When does neuralation occur?
a) 1st week
b) 2nd week
c) 3rd week
d) 4th week
View Answer
Explanation: Neuralation is a process of transformation of neural late into the neural tube. The embryo at this stage is termed as neurula. It occurs during 3rd week of gestation period.
5. Where does the development of the notochord begin?
a) In the middle between two layer of bilaminar disc
b) From endodermal layer
c) At prechordal plate
d) At cranial end
View Answer
Explanation: The development of the notochord begins in the middle between two layers of bilaminar disc.
6. Formation of primitive streak marks the beginning of ____________
a) neuraltion
b) gastrulation
c) folding
d) notochord formation
View Answer
Explanation: Primitive streak is the structure that forms in blastula during the early stages of embryonic development. It forms on the dorsal face of the developing embryo towards the posterior end.
7. The notochord is essential for all except ____________
a) to develop into mesoderm
b) to establish axis of the body
c) to establish nervous tissue in ectoderm
d) influence embryonic folding
View Answer
Explanation: Notochord is a flexible rod made out of a material similar to cartilage. It serves as a source of midline signals that pattern surrounding tissues and as a major skeletal element of the developing embryo.
8. The signals for parturition arises from___________
a) placenta
b) oxytocin
c) fetus
d) placenta and fully developed fetus
View Answer
Explanation: The signals for parturition arise from Placenta and fully developed fetus. It is followed by uterine contraction.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
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