In this anatomy lesson, i’m going to cover the rib bones, also called costae in Latin. The ribs help protect critical organs in the thorax such as the heart and lungs, and also they help with breathing.
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Don’t it is in fooled their long, curved shape! Rib bones are not divide as lengthy bones. Instead, anatomists divide the ribs as level bones, and they are located within the axial skeleton. In addition to the sternum, thoracic vertebrae, and costal cartilages, the ribs type the thoracic cage, additionally called the bony thorax.
The average skeleton consists of 24 individual ribs, developed in 12 pairs, and also they are split into three main categories: true ribs, false ribs, and also floating ribs.
True Ribs, False Ribs, and also Floating RibsThe true ribs include rib bag 1-7, with each rib articulating posteriorly come the thoracic vertebrae and also anteriorly come the sternum via costal cartilages. Because the true ribs affix to both the thoracic vertebrae and the sternum, anatomists sometimes splice those terms together and also call the true ribs “the vertebrosternal ribs.”The false ribs encompass rib bag 8-12. Favor the true ribs, these false ribs articulate v thoracic vertebrae posteriorly. However, they carry out not affix directly to the sternum anteriorly, and instead, connect to the costal cartilage the the preceding (superior) rib, except for false ribs 11-12, which room the floating ribs. Because the false ribs affix to the vertebrae posteriorly and costal cartilage anteriorly, anatomists sometimes contact the false ribs vertebrochondral ribs (vertebro = vertebrae; chondral = cartilage).The floating ribs (11-12) space the last two pairs the false ribs, but unlike the various other false ribs, they do not affix to the cartilage of the coming before ribs on the anterior side. Instead, they affix posteriorly come the thoracic vertebrae and “float” there is no attaching to the costal cartilage anteriorly, therefore anatomists simply contact them “vertebral ribs.”
The space between every rib is called the intercostal space, and also there space 11 intercostal spaces in the thoracic cage, which are filled with nerves, lymph nodes, arteries, veins, and also muscles. In fact, when you eat ribs at a restaurant, you’re eat the intercostal muscles of an animal.
There room three main varieties of intercostal muscle, i beg your pardon facilitate chest movement: outside intercostal muscles, internal intercostal muscles, and also innermost intercostal muscles.
Each intercostal room is numbered after ~ the rib directly over it. Therefore the an initial intercostal room will be the room just below the very first rib; the 2nd intercostal space is the an are below the 2nd rib, and so on.
These intercostal spaces are necessary landmarks because that nurses and other medical care professionals, specifically when assessing lung sounds and heart sounds.
As I discussed in mine sternum anatomy video, the 2nd pair the ribs meet at the junction in between the manubrium and also the human body of the sternum, creating the sternal angle (or angle of Louis). The 2nd intercostal room will be just listed below the second pair that ribs. Indigenous there, you have the right to count the intercostal spaces to situate the apical pulse, i m sorry is top top the left next of the chest at the fith intercostal space, under the midclavicular line.
Other intercostal spaces will permit you to assess different chest evaluate sounds.
Rib Bone Anatomy and also Landmarks
When examining individual rib bones, you’ll notification that some have different structures, so anatomists categorize ribs right into two key types: typical and atypical.
Typical Rib Bones
Typical ribs include ribs 3-9, and they feature a shaft (or body), head, neck, groove, tubercle, and also anterior extremity.
Atyipcal Rib Bones
The patent ribs incorporate ribs 1, 2, 10, 11, and also 12.
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Free Quiz and an ext Anatomy Videos
Take a free ribs anatomy quiz come test her knowledge, or review our ribs anatomy video. In addition, you can want to clock our anatomy and physiology lectures ~ above YouTube, or examine our anatomy and also physiology notes.