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  • Choose the correct statementOption: 1 The five coccygeal vertebrae are fused to form a curved triangular bone called the coccyx.<div cl

Choose the correct statement

Option: 1

The five coccygeal vertebrae are fused to form a curved triangular bone called the coccyx.


Option: 2

In females, the coccyx points inferiorly but in male it points anteriorly


Option: 3

Thoracic vertebrae are 18 in number and they are present in the chest. 


Option: 4

The first cervical vertebra is called axis while the second cervical vertebra is known as the atlas


Answers (1)

best_answer

Vertebral Column (Backbone) -

  • Our vertebral column is formed by 26 serially arranged units called vertebrae and is dorsally placed. 
  • It is actually made up of 33 vertebrae. 
  • However, it consists of 26 bones because five sacral vertebrae are fused to form one sacrum and four coccygeal vertebrae are fused to form one coccyx.
  • It extends from the base of the skull and constitutes the main framework of the trunk.
  • Each vertebra has a central hollow portion (neural canal) through which the spinal cord passes. 
  • The vertebral column is differentiated into: 
    • cervical (7) 
    • thoracic (12) 
    • lumbar (5) 
    • sacral (1; 5 fused) 
    • coccygeal (1; 4 fused)

 

 

Cervical Vertebrae:

  • These are 7 in number present in the neck, the first cervical vertebra is called atlas, the second cervical vertebra is known as the axis. 
  • The atlas supports the head and is named for the mythological Atlas who supported the world on his shoulders.

Thoracic Vertebrae:

  • These are 12 in number present in the chest. 
  • They are larger and stronger than the cervical vertebrae. 
  • They articulate with ribs.

Lumbar Vertebrae:

  • These are 5 in number present in the abdomen. 
  • They are the largest and strongest in the vertebral column. 
  • Their processes are short and thick. 
  • The spinous pro­cesses are thick and broad and project posteriorly.

Sacrum:

  • The five sacral vertebrae are fused in the adult, forming one structure called the sacrum, which lies between the innominate bones of the pelvic girdle. 
  • The female sacrum is shorter, wider than the male sacrum.

Coccyx:

  • The four coccygeal vertebrae are fused to form a curved triangular bone called the coccyx. 
  • In females, the coccyx points inferiorly but in the male, it points anteriorly. It is considered as a vestigial tail
       Hence, the correct option is b. In females, the coccyx points inferiorly but in male it points anteriorly

 

Posted by

Deependra Verma

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