MV Human Male Ribs Sternum Spine Medical Skeletal  3D Cross Section

The human thoracic cage, commonly referred to as the rib cage, consists of 12 pairs of ribs, the sternum (breastbone), and the thoracic vertebrae of the spine. Here’s a brief overview of each component:

Ribs

• Number: Typically, there are 12 pairs of ribs, totaling 24 ribs.
• Classification:
  • True Ribs: The first seven pairs (1-7) attach directly to the sternum via costal cartilages.
  • False Ribs: The next three pairs (8-10) do not attach directly to the sternum but connect to the costal cartilage of the seventh rib.
  • Floating Ribs: The last two pairs (11-12) do not attach to the sternum at all.

Sternum

• Also known as the breastbone, the sternum is a flat bone located in the center of the chest. It consists of three parts:
  • Manubrium: The upper section that connects to the first rib and clavicles.
  • Body: The central part that connects to the true ribs.
  • Xiphoid Process: The small, cartilaginous lower part that can ossify with age.

Spine

• The thoracic spine consists of 12 vertebrae (T1-T12) that correspond to the ribs. Each rib articulates with two thoracic vertebrae at the back, forming joints that allow for some movement and flexibility.

Function

The rib cage provides structural support, protects thoracic organs, and plays a role in respiration by allowing the lungs to expand and contract during breathing.

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