<prompt> Perichondrial ring is:Seen around foramen magnumSeen around epiphyseal plateMore prominent in adultsShear strength increases with age  <response>: The perichondrial ring- surrounds the growth plate circumferentially. Peri-chondrial 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. 