Question

what is present almost at centre in thoraic cage.​

Answer 1

Answer:

Anatomical terms of bone

The sternum or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major blood vessels from injury.

Answer 2

Answer:

The thoracic cage (rib cage) is the skeleton of the thoracic wall. It is formed by the 12 thoracic vertebrae, 12 pairs of ribs and associated costal cartilages and the sternum.

The thoracic cage takes the form of a domed bird cage with the horizontal bars formed by ribs and costal cartilages. It is supported by the vertical sternum or breastbone (anteriorly) and the 12 thoracic vertebrae (posteriorly). The thoracic cage can also be described as an osteocartilaginous cage formed by the sternum, 12 pairs of ribs and costal cartilages, 12 thoracic vertebrae and the intervertebral (IV) discs interposed between them.

The thoracic cage, like skeletal tissue in most parts of the body, serves to support the thorax. It also has several functions, such as:

protecticting vital thoracic and abdominal internal organs from external forces

resisting the negative internal pressures generated by the elastic recoil of the lungs and respiration-induced movements

providing attachment for and supporting the weight of the upper limbs

providing the anchoring attachment (origin) of many of the muscles that move and maintain the position of the upper limbs relative to the trunk.