Question
Which of the following is derived from the marked structure in the given image?
| A. |
Ribs
|
| B. |
Kidneys
|
| C. |
Dorsal root ganglion
|
| D. |
Parietal pleura
|
Show Answer
|
Correct Answer � A
Explanation
|
|
The marked area in the image highlights a portion of the paraxial mesoderm within a transverse section of the developing embryo, specifically the somite.
The somites are derived from the paraxial mesoderm and differentiate into the sclerotome, myotome, and dermatome.
- Sclerotome: Gives rise to the vertebrae and ribs.
- Myotome: Forms the skeletal muscles.
- Dermatome: Forms the dermis of the skin.
Thus, the ribs are derived from the sclerotome of the somite, which is represented by the marked structure.
Why Other Options are Incorrect:
Kidneys: Derived from the intermediate mesoderm, not the somite.
Dorsal root ganglion: Derived from neural crest cells, not the somite.
Parietal pleura: Derived from the lateral plate mesoderm, not the somite.
