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Anatomy of Atypical Ribs: 10th, 11th, and 12th Ribs

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Anatomy of Atypical Ribs: 10th, 11th, and 12th Ribs

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Questions and Answers

What is the primary function of the crest on the head of the rib?

To provide attachment for ligaments

To allow rotation of the rib during respiration

To facilitate the articulation with the vertebral column

To separate the superior and inferior articular surfaces (correct)

Which of the following is NOT a characteristic of the posterior end of the rib?

Presents two articular surfaces

Consists of a head, neck, and tubercle

Continuous with its costal cartilage (correct)

Articulates with the vertebral column

What is the primary function of the tubercle on the posterior end of the rib?

To facilitate the articulation with the vertebral column

To separate the superior and inferior articular facets

To allow for the movement of the rib during respiration

To provide attachment for the costotransverse ligament (correct)

Which of the following is the LARGEST articular surface on the rib head?

The inferior articular surface Signup and view all the answers

What is the primary purpose of the articular facets on the rib head?

To facilitate the articulation between the rib and vertebral column Signup and view all the answers

Which of the following is NOT a characteristic of the anterior end of the rib?

Presents two articular surfaces Signup and view all the answers

What is the primary function of the neck of the rib?

To separate the head and tubercle of the rib Signup and view all the answers

Which of the following is the SMALLEST articular surface on the rib head?

The superior articular surface Signup and view all the answers

What is the primary function of the curved shaft of the rib?

To provide attachment points for the intercostal muscles Signup and view all the answers

Which of the following is NOT a characteristic of the rib?

Presents two articular surfaces on the head Signup and view all the answers

Study Notes

Ribs

There are 12 pairs of ribs, each terminating anteriorly in a costal cartilage
Classification of ribs according to their attachments to the sternum:
- True ribs: Upper 7 ribs (directly attached to the sternum)
- False ribs: Lower 5 ribs (indirectly attached to the sternum)

Atypical Ribs

1st, 2nd, 10th, 11th, and 12th ribs are atypical
10th rib: Single articular facet on the head
11th and 12th ribs:
- Articulate only with the bodies of their own vertebrae
- No tubercles or necks
- Short, little curved, and pointed anteriorly
2nd rib:
- Head has 2 facets
- Surfaces go between typical thoracic vertebrae

Typical Ribs

Consist of a curved shaft with anterior and posterior ends
Anterior end is continuous with its costal cartilage
Posterior end articulates with the vertebral column and has:
- Head: Presents 2 articular surfaces separated by a crest
- Neck
- Tubercle

Thoracic Vertebrae

Body: Heart-shaped and carries 2 demi-facets at its side
Transverse process: Has a facet for rib tubercle of the same number
Spine: Long, pointed, and directed downward and backward
Vertebral foramen: Small and circular
Superior articular processes: Flat, with articular surfaces facing posteriorly
Inferior articular processes: Face anteriorly

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Description

Learn about the unique characteristics of atypical ribs, such as the presence of a single articular facet on the head of the 10th rib and the lack of tubercles or necks in the 11th and 12th ribs. Explore how these ribs differ in size, curvature, and anterior pointing.