<prompt> Perichondrial ring is -Seen around foramen magnumSeen around epiphyseal plateMore prominent in adultsShear strength increases with age  <response>: The perichondrial ring of La Croix also surrounds the growth plate circumferentially, similar to perichondrial groove. Perichondrial ring extends towards metaphysis and become continuous with periosteum of metaphysis.With increasing age, perichondrial ring is thinned and its shear resistance strength is decreased. 