Mandible formed before frontal bone:
- a. True.
- b. False.
Answer: a. True
The mandible is the second bone to ossify in the human fetus, after the clavicle. This occurs at around 6 weeks of gestation. The frontal bone, on the other hand, ossifies at around 8 weeks of gestation. Therefore, the mandible is formed before the frontal bone.
Here is a timeline of skeletal development in the human fetus:
- Week 6: Mandible ossifies.
- Week 8: Frontal bone ossifies.
- Week 10: Temporal bones ossify.
- Week 12: Parietal bones ossify.
- Week 14: Occipital bone ossifies.
It is important to note that ossification is a gradual process, and the bones of the skull are not fully formed until after birth. However, the mandible is the first bone in the skull to begin ossifying, and it is therefore considered to be formed before the frontal bone.
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