Question

Obturator foramen is found in

• A. Frog's pelvic girdle
• B. Frog's pectoral girdle
• C. Rabbit's pelvic girdle
• D. Rabbit's pectoral girdle

Answer 1

Answer: (C)

Rabbit's pelvic girdle

Looking to the bone, it reveals that the surface is not smooth but scarred with bumps, holes and ridges. These are surface markings, where muscles, tendons and ligaments attached, blood and lymph vessels and nerves pass. Some of the important depression and openings are
(1) Fissure- narrow, cleft-like opening between adjacent parts of the bone. Example: Superior orbital fissure.
(2) Foramen- a bigger, round opening. Example: Foramen magnum in the skull. Obturator foramen is a large oval or irregularly triangular aperture in the hip bone (pelvic girdle of mammals), the margins of which are formed by the pubis and the ischium.
(3) Meatus- a relatively narrow tubular canal. Example: External auditory meatus.
(4) Groves and sulcus- are deep furrow on the surface of a bone or other structure. Example: Inter-vertebral and radial grooves of the humerus.
(5) Fossa- shallow depressed area. Example: Mandibular fossa.