What are typical atypical ribs?

Most of the ribs are typical ribs ie they have all these features. The atypical ribs which do not have all these features are: First rib (wide and short, has two costal grooves, and one articular facet)

What are typical atypical ribs?

Most of the ribs are typical ribs ie they have all these features. The atypical ribs which do not have all these features are: First rib (wide and short, has two costal grooves, and one articular facet)

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.

How does the 1st rib differ from other true ribs?

The first rib is unique and easier to distinguish than other ribs. It is a short, flat, C-shaped bone, and attaches to the manubrium. The vertebral attachment can be found just below the neck at the first thoracic vertebra, and the majority of this bone can be found above the level of the clavicle.

What is the difference between typical and atypical vertebrae?

The main difference between typical and atypical vertebrae is that typical vertebrae consist of a body, vertebral arch, and transverse processes, whereas atypical vertebrae contain deviated structures based on their functional requirements.

What is the 1st rib?

The first rib (top most) is the most curved and usually the shortest of all the ribs and begins from thoracic vertebrae 1 (T1). It articulates with the sternum jut below where the collarbone meets the sternum. It has muscular attachments from the serratus anterior and the anterior scalene.

Why is the first rib special?

The first rib is the most superior of the twelve ribs. It is an atypical rib and is an important anatomical landmark. It is one of the borders of the superior thoracic aperture. The ribs form the main structure of the thoracic cage that protects the thoracic organs.

What is first rib syndrome?

Thoracic outlet syndrome (TOS) is a group of disorders that occur when blood vessels or nerves in the space between your collarbone and your first rib (thoracic outlet) are compressed. This can cause shoulder and neck pain and numbness in your fingers.

Why is the first rib atypical?

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.

Why is the first rib not palpable?

The first rib is difficult to palpate. That’s because it lies both below and behind the clavicle, and also because there’s a thick layer of muscle in front of it. The lateral end of the clavicle articulates with this projection on the scapula, the acromion, forming the acromio-clavicular joint.

What makes C1 atypical?

C1 and C2 are considered atypical vertebrae because they have some distinguishing features compared to the rest of the cervical spine. C1 Vertebra (the atlas). The top vertebra, called the atlas, is the only cervical vertebra without a vertebral body. Instead, it is shaped more like a ring.

What causes T1 atypical?

The 1st thoracic vertebra is considered an “atypical” because of the complete costal facet for the head of the 1st rib.

What are typical and atypical ribs?

There are two classifications of ribs – atypical and typical. The typical ribs have a generalised structure, while the atypical ribs have variations on this structure. The typical rib consists of a head, neck and body: The head is wedge shaped, and has two articular facets separated by a wedge of bone.

What are the characteristics of a typical rib?

Typical Ribs. The typical rib consists of a head, neck and body: The head is wedge shaped, and has two articular facets separated by a wedge of bone. One facet articulates with the numerically corresponding vertebrae, and the other articulates with the vertebrae above. The neck contains no bony prominences,…

What is the shape of the first rib?

First Rib. The first rib is the widest, shortest and has the sharpest curve of all the ribs. The head only articulates with the body of the T1 vertebra and therefore only one articulatory surface is present. As in the typical ribs, the tubercle has a facet for articulation with the transverse process of vertebrae.

What are the two types of ribs?

There are two classifications of ribs – atypical and typical. The typical ribs have a generalised structure, while the atypical ribs have variations on this structure. Typical Ribs. The typical rib consists of a head, neck and body: The head is wedge shaped, and has two articular facets separated by a wedge of bone.