Question

Each os coxae of the pelvic girdle consists of the following three fused bones:

A) ulna, radius, and humerus
B) ilium, ischium, and pubis
C) femur, tibia, and fibula
D) hamate, capitate, and trapezium
E) femur, patella, and tibia

Answer 1

Each os coxae of the pelvic girdle consists of the fused bones ilium, ischium, and pubis. These bones support body weight, attach lower limbs, and ensure locomotion, and they fuse during late teenage years.

Step-by-step explanation:

The Composition of the Pelvic Girdle

The pelvic girdle, also known as the hip girdle, plays a crucial role in the skeletal system. Each os coxae of the pelvic girdle consists of three fused bones: the ilium, the ischium, and the pubis. Together, these bones form the large, curved structure that supports the weight of the body, attaches the lower limbs, and ensures mobility. The os coxae join anteriorly at the pubic symphysis and posteriorly to the sacrum, forming the entire bony pelvis structure, which also includes the coccyx.

Specifically, the ilium forms the large fan-shaped superior portion of the hip bone, the ischium forms the posteroinferior portion, and the pubis forms the anteromedial portion. This trifecta of bones fuses together during the late teenage years and remains as distinct regions in an adult's hip bone. The answer to which set of bones fuses to form each os coxae of the pelvic girdle is option B: ilium, ischium, and pubis.