Ribs And Sternum, definition, structure and functions

 Ribs And Sternum

Topic = Hello students today topic is Ribs And Sternum. Please read it completely because this is a very impotent topic and if you like this post, then you will definitely follow this blog. 


Long semi - circular bones forming the rib cage are known as ribs. They  encapsulate the chest forming a periphery. They also allow the expansion of lungs for respiration by expending the chest (thorax). Organs like heart and lungs are protected by the ribs.

Basic Structure of a Ribs:

In human, 12 pairs of ribs are present and there are single rib made up of 3 basic structure of a ribs. 

1) Head: This is the part of that attaches the rib in the vertebrae. the such of the rib lies just adjacent to head of rib.

2) Skull: The length of a rib is termed as shaft; it has costal grooves from where the blood vessels and never pass.

3) Tubercle: Tubercle is the terminal (end) part of the ribs which gets attached to vertebrae of the thorax.

Types of Ribs:

Ribs can be sub-divided into 3 types of ribs are as follows.

1) True Ribs:  Ribs that are directly attached to the sternum (Via cartilages) are termed as true ribs.

2) False Ribs: Ribs which are not directly attached to the sternum are termed as false ribs.

3) Floating Ribs: These ri bs are not attached to the sternum.


Sternum or breastbone is a 'T" Shaped or dagger shaped long flat bone. located at the centre of thoracic cavity where it is joined to the ribs with the help of cartilages and forms the formal part of the cage.

This rib cage protects the heart, lungs, major blood vessels, etc, from physical injury or damage.

The three main regions of sternum are:

1) Manubrium: it is the uppermost part of the sternum consisting of two notches, i.e, jugular notch and clavicular notch. Clavicle (collar bone) attaches at the clavicular notch.
2) Body: Body is that part of sternum where the (2-7) get  attached via cartilages.

3) Xiphoid Process: At the time of birth the xiphoid process as a cartilage, which harden due to ossification, as the age progresses.

1) it acts as the point of attachment for the muscles of the abdomen.

2) it is the main point for cardiopulmonary resuscitation.

Function of sternum:

1) Sternum completes the rib cage circle thus protecting the vital organs.
2) Ribs are connected to sternum via costal cartilage, thereby providing fexibility.
3) It is also protects the aorta, vena cava and thymus.
4)  Sternum fills the space in the mid region of the chest just above the lungs and the heart.

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