Question

Obturator foramen is present between
(a)Ilium and Ischium
(b)Ischium and pubis
(c)Ilium and pubis
(d)None of the above

Answer 1

Hint: A foramen is said to be an opening, present inside the body, which allows key structures to connect one part of the body to another. There are 21 foramina (plural) seen in the human skull in the bones like frontal, ethmoid, sphenoid, maxilla, temporal, etc.

Complete Answer:
Obturator foramen is a large opening present between the hip bones pubis and ischium. Pubis and ischium make up the pelvic girdle along with the ilium bone. Actually, these three bones make up the coxal bone, and two coxal bones make up the pelvic girdle. The obturator foramen is the hole that allows nerves (obturator nerve) and blood vessels (obturator artery and vein) to pass through the pelvis. It is seen that the obturator foramen is oval-shaped in males and triangular and wider in females.

Additional information:
Let us look in detail at the pelvic and pectoral girdles of the body.
-Pelvic girdle is found in our hips and the pectoral girdle in our shoulders.
-Pectoral and pelvic girdles are responsible for articulating the bones of the upper and lower limbs respectively with the axial skeleton.
-Each girdle is formed by two halves like the pelvic girdle was formed by two coxal bones.
-Whereas the pectoral girdle is made up of two halves each of which consists of a scapula and clavicle.
-Scapula is a large triangular bone that has a ridge known as the acromion process to which the clavicle is attached.
-There is a depression below this process known as the glenoid cavity to which the humerus articulates to form the shoulder joint.
-Each pelvic girdle is made up of two coxal bones that are formed by the fusion of ilium, ischium, and pubis.
-It has a cavity at the point of fusion of these bones known as the acetabulum cavity to which the femur articulates to form the hip joint.

So, the correct option is ‘Ischium and pubis’.

Note:
-Axial skeleton is that part of the skeleton consisting of bones of the skull, rib cage, vertebral column which form the axis of the body.
-Clavicle is a long slender bone that is commonly known as the collarbone.
-The two halves of the pelvic girdle from the pubic symphysis when they meet ventrally.