Multiple Choice
The embryonic period of a time of rapid organogenesis. By about what age are all organ systems recognizable?
28. Human Development
Embryonic Development (Weeks 3-8)
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Which of the following is the middle layer of the trilaminar disc?
A
Endoderm
B
Ectoderm.
C
Mesoderm.
D
Neuroderm.
Verified step by step guidance1
Understand the concept of the trilaminar disc, which is an early embryonic structure formed during the third week of development. It consists of three layers: ectoderm, mesoderm, and endoderm.
Identify the position of each layer in the trilaminar disc. The ectoderm is the outermost layer, the mesoderm is the middle layer, and the endoderm is the innermost layer.
Recognize that the mesoderm is responsible for forming many structures in the body, including muscles, bones, and the circulatory system.
Consider the options provided: Endoderm, Ectoderm, Mesoderm, and Neuroderm. Recall that Neuroderm is not a standard term used to describe any of the layers in the trilaminar disc.
Conclude that the middle layer of the trilaminar disc is the mesoderm, based on its position between the ectoderm and endoderm.
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