Question

Bifurcated spinous process is present in
1. All cervical vertebrae
2. Second and Sixth cervical vertebrae
3. All thoracic vertebrae
4. First and seventh cervical vertebrae

Answer 1

Hint:- The vertebral column, also called backbone or spine is a curved, vertical rod, long, in the mid dorsal line of the neck and the trunk. It consists of a row of 33 movably articulated, ring-like bones called the vertebrae. Between these vertebrae are present cartilaginous intervertebral discs.

Complete Answer:-
The vertebrae in humans are categorized into five categories:
Cervical vertebrae- These are seven in number and are present in the neck. The first cervical vertebrae is called the atlas. It provides the up-down or nodding movement to the skull on it. The second vertebrae is called the axis which bears an odontoid process. It allows the side to side turning movement to the atlas and skull together on it. The cervical vertebrae have apertures called foramina transversia, in their transverse processes. Bifurcated spinous is also found in the second and the sixth cervical vertebrae.
Thoracic vertebrae- These are 12 in number and are present in the upper back. They are modified to provide the articulation to the ribs at the special facets on the central.
Lumbar vertebrae- These are five in number and are located in the abdomen. They are the largest and strongest to bear the weight of the abdominal viscera that hang from their region of the back. They have large neural spines and transverse processes.
Sacral vertebrae- It is a large and triangular bone formed by the fusion of five sacral vertebrae and lies between the pelvic girdles.
Coccyx- It is a small triangular bone formed by fusion of four coccygeal or caudal vertebrae.
So the correct answer is 2. Second and Sixth cervical vertebrae.

Note:- A notable feature in the vertebral column of humans is the formation of four curves- cervical, thoracic, lumbar and sacral located in the neck, thorax, abdomen and pelvis respectively. This helps to maintain the balance and makes walking erect on two legs much easier.