Which germ layer is the thymus derived from?
A. ectoderm
B. mesoderm
C. endoderm
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Question 2) Through what structure do epiblast cells migrate to form the mesoderm?
A. lacunae
B. chorionic villi
C. hypoblast
D. primitive streak
E. blastocele
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Question 3) Which of the following is derived from ectoderm?
A. lens of the eye
B. thymus gland
C. tonsils
D. urinary bladder
E. dermis of skin
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Question 4) Which of the following is derived from endoderm?
A. brain
B. muscle
C. epidermis of the skin
D. lining of the digestive tract
E. cardiovascular system
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Question 5) Which of the following is formed from mesoderm?
A. autonomic neurons
B. dermis of the skin
C. adrenal medulla
D. teeth
E. tonsils
(
Question 6) Damage to the mesoderm during embryological development would affect the formation of the
A. thyroid.
B. brain.
C. heart.
D. teeth.
E. urinary bladder.
(
Question 7) Which of the following organ systems is derived from all three germ layers?
A. nervous
B. cardiovascular
C. endocrine
D. integumentary
E. skeletal
(
Question 8) Gastrulation is the process of development that produces the
A. placenta.
B. embryonic disk.
C. germ layers.
D. rudimentary organs.
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Question 9) The embryonic membrane that completely encloses the embryo in a watery sac is the
A. yolk sac.
B. amnion.
C. allantois.
D. chorion.
E. ectodermal sac.
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Question 10) Some epiblast cells migrate and emerge between the epiblast and endoderm as a new germ layer called the
A. yolk sac.
B. mesoglia.
C. notochord.
D. mesoderm.
E. primitive streak.
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