A. 26 weeks.
B. 36 weeks.
C. 46 weeks.
D. 56 weeks.
The lack of cartilage and the easy foldability (lack of recoil) as shown in the picture above are evident in the ear of this premature infant at 26 weeks.
- Cartilaginous development proceeds in an orderly manner during gestation and can be assessed by examination of the external ear.
- Although the normal incurving of the upper pinnae begins at 33 to 34 weeks and is complete at term, it is more reliable to assess the extent of cartilage in the pinnae by feeling its edge and folding the ear.
- Until approximately 32 weeks, there is only minimal recoil of a folded ear, but by term there is instant recoil.