Which one of the following cartilage helps in the easy birth of young ones without damage to pelvic girdle?

The pubic symphysis is a fibrocartilaginous joint that connects the left and right pubic bones of the pelvic girdle. This joint consists of a fibrocartilage disc that provides a strong yet flexible connection capable of withstanding significant tension and pressure. During pregnancy, the secretion of the hormone relaxin increases the flexibility and mobility of this fibrocartilage, leading to a physiological widening of the pelvic ring. This expansion is crucial for accommodating the passage of the baby through the birth canal, thereby facilitating an easier delivery and preventing damage to the maternal pelvic girdle. While hyaline cartilage is present as a thin layer covering the bone ends, it is the structural properties and hormonal responsiveness of the fibrous cartilage (fibrocartilage) that allow for the necessary pelvic expansion during childbirth.

Sources

1. [1] https://www.ncbi.nlm.nih.gov/books/NBK537043/
2. [2] https://en.wikipedia.org/wiki/Pubic_symphysis