What is the name of the anatomical structure on the upper surface of the first rib?

The costal cartilage of the first rib articulates with the manubrium of the sternum not at the top, but lower down at its broadest part. The first costal cartilage is short and massive. It hardly permits any movement, so the two first ribs, together with the manubrium, move up and down together as one solid arch.

What muscle has attached to the upper surface of the first rib?

Attachments. The first rib has several attachments which are listed below; Anterior scalene muscle: scalene tubercle. Middle scalene muscle: between groove for the subclavian artery and transverse tubercle.

Where does 1st rib attach?

The first ribs attach to the manubrium. The elongated, central portion of the sternum is the body. The manubrium and body join together at the sternal angle, so called because the junction between these two components is not flat, but forms a slight bend. The second rib attaches to the sternum at the sternal angle.

In what plane are the surfaces of the first rib?

oblique plane
The first rib (Figure 2) is the shortest, strongest, broadest and most curved rib. It lies in an oblique plane, sloping forwards and downwards and forms the junction between the the roof of the thoracic cavity and the root of the neck.

What are ribs attached to?

sternum
The first seven ribs in the rib cage are attached to the sternum by pliable cartilages called costal cartilages; these ribs are called true ribs. Of the remaining five ribs, which are called false, the first three have their costal cartilages connected to the cartilage above them.

What are the muscles attached to the rib cage known as?

Intercostal muscles are many different groups of muscles that run between the ribs, and help form and move the chest wall. The intercostal muscles are mainly involved in the mechanical aspect of breathing by helping expand and shrink the size of the chest cavity.

What muscles attach to the ribs?

The intercostals are muscles between the ribs that form the chest cavity wall. Lying below the pectoral muscles, the intercostal muscles form the chest wall and play a key role in respiration. All intercostal muscles originate on the lower border of a rib and attach to the upper border of the rib below.

Where do the ribs attach?

True ribs (1–7) attach directly to the sternum via their costal cartilage. The false ribs (8–12) either attach to the sternum indirectly or not at all. Ribs 8–10 have their costal cartilages attached to the cartilage of the next higher rib.

What are the four different places where ribs attach?

Each rib consists of a head, neck, and a shaft. All ribs are attached posteriorly to the thoracic vertebrae. They are numbered to match the vertebrae they attach to – one to twelve, from top (T1) to bottom. The head of the rib is the end part closest to the vertebra with which it articulates.

What are the features of the first rib?

The first rib is the most curved and usually the shortest of all the ribs; it is broad and flat, its surfaces looking upward and downward, and its borders inward and outward. The head is small, rounded, and possesses only a single articular facet, for articulation with the body of the first thoracic vertebra.

What is different about the first rib?

The first rib is atypical because it is wide and short, has two costal grooves, and one articular facet. The second rib is thin, long, and has a tuberosity on its superior surface for the attachment of the serratus anterior muscle. The tenth rib has only one articular facet.

What does sharp rib pain mean?

Rib cage pain can be caused by a variety of things, ranging from pulled muscles to a rib fracture. The pain may occur immediately upon injury or develop slowly over time. It can also be a sign of an underlying medical condition. You should report any instance of unexplainable rib cage pain to your doctor immediately.

Is the first rib superior to the other ribs?

The first rib is the most superior of the twelve ribs. It is an atypical rib and is an important anatomical landmark and is one of the borders of the superior thoracic aperture. Compared to a typical rib , the first rib is short and thick and it has a single articular facet for the costovertebral joint.

What does the first rib look like in gross anatomy?

Gross anatomy. Osteology. Compared to a typical rib, the first rib is short and thick and it has a single articular facet for the costovertebral joint. It is flattened from top to bottom.

What is the shape of the rib cage from the side?

When seen from the side, its upper border lies in a plane that’s about 30° from the horizontal. In addition, when seen from in front its flat upper surface slopes downward, also at about 30°. The costal cartilage of the first rib articulates with the manubrium of the sternum not at the top, but lower down at its broadest part.

What are the attachments of the first rib?

The first rib has several attachments which are listed below; Anterior scalene muscle: scalene tubercle Middle scalene muscle: between groove for the subclavian artery and transverse tubercle Intercostal muscles: from the outer border