In this anatomy lesson, ns going come cover the rib bones, additionally called costae in Latin. The ribs help protect critical organs in the thorax such together the heart and also lungs, and also they aid with breathing.
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Don’t be fooled their long, bent shape! Rib bones space not share as long bones. Instead, anatomists share the ribs as level bones, and also they are situated within the axial skeleton. In addition to the sternum, thoracic vertebrae, and also costal cartilages, the ribs kind the thoracic cage, also called the bony thorax.
The median skeleton contains 24 separation, personal, instance ribs, created in 12 pairs, and they are divided into three key categories: true ribs, false ribs, and floating ribs.
True Ribs, False Ribs, and Floating RibsThe true ribs include rib bag 1-7, v each rib articulating posteriorly come the thoracic vertebrae and also anteriorly to the sternum via costal cartilages. Because the true ribs connect to both the thoracic vertebrae and also the sternum, anatomists occasionally splice those terms together and also call the true ribs “the vertebrosternal ribs.”The false ribs include rib pairs 8-12. Favor the true ribs, this false ribs articulate v thoracic vertebrae posteriorly. However, they do not attach directly come 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 attach to the vertebrae posteriorly and also costal cartilage anteriorly, anatomists sometimes contact the false ribs vertebrochondral ribs (vertebro = vertebrae; chondral = cartilage).The floating ribs (11-12) room the last two pairs that false ribs, but unlike the various other false ribs, they do not attach to the cartilage the the coming before ribs top top the anterior side. Instead, they affix posteriorly to the thoracic vertebrae and also “float” there is no attaching to the costal cartilage anteriorly, for this reason anatomists simply speak to them “vertebral ribs.”
The an are between each rib is dubbed the intercostal space, and there are 11 intercostal spaces in the thoracic cage, which room filled v nerves, lymph nodes, arteries, veins, and also muscles. In fact, once you eat ribs in ~ a restaurant, you’re eating the intercostal muscles of an animal.
There room three main types of intercostal muscle, i beg your pardon facilitate chest movement: external intercostal muscles, inner intercostal muscles, and also innermost intercostal muscles.
Each intercostal space is numbered after the rib directly over it. Therefore the very first intercostal space will be the room just listed below the first rib; the second intercostal space is the space below the 2nd rib, and also so on.
These intercostal spaces are important landmarks for nurses and also other medical care professionals, particularly when assessing lung sounds and heart sounds.
As I mentioned in my sternum anatomy video, the second pair the ribs accomplish at the junction in between the manubrium and also the body of the sternum, creating the sternal edge (or edge of Louis). The 2nd intercostal space will be just below the second pair that ribs. From there, you can count the intercostal spaces to situate the apical pulse, which is ~ above the left next of the chest in ~ the fith intercostal space, under the midclavicular line.
Other intercostal spaces will allow you come assess different chest evaluate sounds.
Rib Bone Anatomy and also Landmarks
When assessing individual rib bones, you’ll notification that part have various structures, so anatomists categorize ribs into two main types: typical and atypical.
Typical Rib Bones
Typical ribs include ribs 3-9, and they feature a obelisk (or body), head, neck, groove, tubercle, and anterior extremity.
Atyipcal Rib Bones
The atypical ribs encompass ribs 1, 2, 10, 11, and 12.
See more: How To Find The 3Rd Angle Of A Triangle, How To Find The Third Angle Of A Triangle
Free Quiz and an ext Anatomy Videos
Take a complimentary ribs anatomy quiz to test her knowledge, or testimonial our ribs anatomy video. In addition, you might want to clock our anatomy and also physiology lectures on YouTube, or check our anatomy and physiology notes.