Question

The coxal bone of the-pelvic girdle is formed by the fusion of
A. ilium, ischium and pubis
B. scapula and clavicle
C. ilium and scapula
D. ilium, scapula and ischium.

Answer 1

Hint:The pubis creates the most anterior part of the pelvic girdle and it joins the two (left and right) coxal bones together at the pubic symphysis joint. The ilium is the largest and the strongest of the three bones that form the coxa.

Complete answer:
To answer this question, first, we need to know about the coxal bone. The coxal bone (hip bone, pelvic bone) is a large, flattened, irregularly shaped bone, constricted in the center and expanded above and below. It meets its partners on the opposite side in the middle line in front, and together they form the sides and anterior wall of the pelvic cavity.
Now, let us find the solution from the option.
Coxal bone includes three parts, they are- ilium, ischium, and pubis, which are different from one other in the young individual, but are fused in the maturity.
The ilium is the uppermost and largest portion of the hip bone.
The ischium is the lower and the back portion of the coxal bone (hip bone). The higher part of this ischium forms roughly one third of the acetabulum.
The pubis extends medialward and downward from the acetabulum and articulates in the middle line with the bone of the opposite side: it forms the front of the pelvis and helps the external organs of generation.

Thus, the correct option is A.i.e. ilium, ischium and pubis.

Note: The pelvic girdle is given the left and right coxal bones which are called the hip bones. The pelvis itself is the bowl-like structure created by the two coxal bones joined in the anterior by the sacrum, and coccyx. During birth, each coxal bone initiates as three separate different bones such as- ilium, ischium and pubis bones – joined by hyaline cartilage.