Which statement about the development of organs is true?
A) Failure of neural folds to fuse in the spinal cord produces spina bifida, while failure to fuse in the brain produces anencephaly.
B) Neural crest cells develop from medial portions of the neural plate and later contribute to development of the brain.
C) Somites are repeating segments of tissue formed from ectoderm.
D) One layer of a somite forms the cartilage of vertebrae and ribs, while another layer contributes to muscles of the heart.
E) Somites form the outer layer (epidermis) of the skin.

Question

Quizplus · Accepted Answer

Failure of neural folds to fuse in different regions can lead to different neural tube defects. Failure to fuse in the spinal cord region produces spina bifida, while failure to fuse in the brain region produces anencephaly.

Answer: B
 Neural crest cells develop from the lateral edges of the neural plate and migrate to various regions of the body, where they contribute to the development of several organs, including the brain.

Answer: D
 Somites are segments of tissue that form from the mesodermal layer and are involved in the development of several organs, including the vertebrae, ribs, and skeletal muscles. One layer of a somite forms the cartilage of vertebrae and ribs, while another layer contributes to the skeletal muscles. None of the layers contribute to the muscles of the heart.

Option C and E are incorrect because somites are not formed from ectoderm and do not form the outer layer (epidermis) of the skin.

Which Statement About the Development of Organs Is True