At the chest, many rib bones connect to the sternum via costal cartilage, segments of hyaline cartilage that allow the rib cage to expand during respiration. Although fixed into place, these ribs do allow for some outward movement, and this helps stabilize the chest during inhalation and exhalation.
The human rib cage is made up of 12 paired rib bones; each are symmetrically paired on a right and left side. While there are some cases of minor anatomical variation, men and women generally have the same amount of ribs.
A differing rib count between the genders is largely a medical myth. The supraspinatus muscle is a rotator cuff muscle located in the shoulder, specifically in the supraspinatus fossa, a concave depression in the rear…. The quadratus plantae is a muscle in the foot that extends from the anterior front of the calcaneus heel bone to the tendons of the digitorum…. The depressor labii inferioris muscle is a four-sided facial muscle located in the jaw area that draws the lower lip down and to the side.
The muscles of the face give it general form and contour, help you outwardly express your feelings, and enable you to chew your food. The quadriceps femoris is a group of muscles located in the front of the thigh. The Latin translation of 'quadriceps' is 'four headed,' as the group…. These ribs also attach to your spine in the back. The 11th and 12th rib pairs are the lowest in the rib cage. Instead, these shorter ribs, also called floating ribs, extend from the spine out to your sides.
Rib pain can affect anyone at any age. In some cases, the pain may feel sharp and stabbing. Or, it may feel like a dull, throbbing ache. The type of pain you experience can help determine its cause. Rib pain can have many causes. It can be due to injury, disease, or other complications. Some of the more common rib pain causes include:. An injury to your ribs or the soft tissue of your rib cage can cause considerable pain. Just breathing in and out can hurt. Some common causes of muscle or bone pain affecting the ribs include:.
Chest pain is the most common symptom of a heart attack. Other symptoms of a heart attack can include:. Other heart-related causes of chest pain include:. Diseases that affect your lungs can cause soreness and discomfort in your rib cage as breathing becomes more difficult. Some of the more common lung-related problems that can cause rib pain include:. Pain in the ribs or chest can also be caused by gastrointestinal conditions, or issues related to your digestive tract.
Some of the most common conditions that may cause rib or chest pain include:. In its earliest stages, cancer often has no symptoms. But as it progresses, signs of the disease can develop quickly. Rib pain associated with cancer is usually the result of:. In some cases, if a rib is severely fractured, it could puncture your lung or cause other complications. It could be a symptom of a heart attack or another heart-related condition that needs treatment.
Module 7: The Appendicular Skeleton. Search for:. The thoracic cage — the ribs and sternum Information There is one last component of the axial skeleton we did not cover last lab: the thoracic cage, also called the rib cage. We examined the thoracic vertebrae last lab, so here we will only examine the ribs and sternum. Figure Ribs and sternum. True, false, and floating ribs. The parts of a rib. On that individual rib, identify which end is the head, and which is the anterior end.
On one of the intact skeletons in the lab, identify all the following components of the thoracic cage: the true ribs the false ribs the floating ribs costal cartilage sternum xiphoid process manubrium sternal body. Licenses and Attributions.
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