Where does the tubercle of rib 4 articulate?

located on the posterior surface of a rib is the tubercle of the rib; this tubercle articulates with the facet located on the transverse process of the same numbered vertebrae.

What does each rib articulate with?

Each rib articulates posteriorly with two thoracic vertebrae by the costovertebral joint.

What parts of the ribs do facets articulate with?

Thoracic vertebrae have bodies of intermediate size. They are distinguished by their long, slender spines and by the presence of facets on the sides of the bodies articulating with the heads of the ribs and by facets on the transverse processes articulating with the tubercles of ribs.

What are the tubercles of the ribs?

Anatomical Parts On the posterior surface at the junction of the neck and body of the rib, and nearer the lower than the upper border, is an eminence—the tubercle; it consists of an articular and a non-articular portion.

Why are ribs 8/12 considered false ribs?

Ribs 8–12 are called false ribs (vertebrochondral ribs). The costal cartilages from these ribs do not attach directly to the sternum. Thus, the cartilage of rib 10 attaches to the cartilage of rib 9, rib 9 then attaches to rib 8, and rib 8 is attached to rib 7.

Why are ribs 8/12 called false ribs?

Why are there 2 Demifacets on the ribs?

The demifacets are bilaterally paired and located on the superior and inferior posterolateral aspects of the vertebrae. They are positioned so that the superior demifacet of the inferior vertebrae articulates with the head of the same rib that articulates with the inferior demifacet of the superior rib.

Why is it called a false rib?

Ribs 1–7 are classified as true ribs (vertebrosternal ribs). The costal cartilage from each of these ribs attaches directly to the sternum. Ribs 8–12 are called false ribs (vertebrochondral ribs). The costal cartilages from these ribs do not attach directly to the sternum.

What is a false rib?

False rib: One of the last five pairs of ribs. A rib is said to be false if it does not attach to the sternum (the breastbone). The upper three false ribs connect to the costal cartilages of the ribs just above them.

How many ribs do humans have in total?

The vast majority of people are born with 12 pairs of ribs, for a total of 24, no matter their sex. The exception to this anatomy rule are people born with specific genetic anomalies. These can take the form of too many ribs (supernumerary ribs) or too few (agenesis of ribs).

Where are the articulations of the ribs located?

The majority of the ribs have an anterior and posterior articulation. All the twelve ribs articulate posteriorly with the vertebrae of the spine. Each rib forms two joints: Costotransverse joint – Between the tubercle of the rib, and the transverse costal facet of the corresponding vertebrae.

What is a tubercle near the head of a rib?

a : a protuberance near the head of a rib that articulates with the transverse process of a vertebra.

Where are the ribs located in the thoracic cage?

Ribs are flattened, curved bones and are numbered 1–12. Posteriorly, the head of the rib articulates with the costal facets located on the bodies of thoracic vertebrae and the rib tubercle articulates with the facet located on the vertebral transverse process.

Which is costal facet articulates with the rib cage?

The upper region articulates with the inferior costal facet on the vertebra above, and the larger region articulates with the superior costal facet on the vertebra with the same number. The transverse process of a thoracic vertebra also articulates at the transverse costal facet with the tubercle of the rib of the same number.