Anatomy: Thorax & Chest Wall

Which ribs are classified as 'true ribs' (vertebrosternal ribs)?

Ribs 1 through 7.

What defines a 'floating rib' and which specific pairs fall into this category?

Floating ribs (11-12) have no anterior attachment; they end in the posterior abdominal musculature.

In the intercostal space, what is the superior-to-inferior order of the neurovascular bundle?

Vein, Artery, Nerve (VAN).

Between which two specific layers of intercostal muscle does the neurovascular bundle travel?

The internal intercostal and the innermost intercostal muscles.

What anatomical feature on the body of a thoracic vertebra articulates with the head of a rib?

Costal facets (or demifacets).

At which vertebral level is the sternal angle (Angle of Louis) located?

The T4-T5 intervertebral disc level.

Which rib articulates with the sternum at the level of the sternal angle?

The 2nd rib.

What is the superior boundary of the superior mediastinum?

The superior thoracic aperture (thoracic inlet).

Which major structure is the primary occupant of the middle mediastinum?

The heart (and the pericardium).

List three major longitudinal structures found in the posterior mediastinum.

Esophagus, thoracic aorta, and azygos vein (or thoracic duct).