The Thorax (Axial Skeletal) (Lab Practical)

Question 1

Ribs

Answer 1

• 24 bones
• Head: the thickened posterior end that articulates with the costal facets of the thoracic vertebra bodies
• Tubercle: a small projection near the head that articulates with the transverse costal facet of a transverse process of a thoracic vertebra

Question 2

Sternum

Answer 2

• 1 bone
• manubrium: the superior part, which articulates with the two clavicles and the first rib pair
• jugular notch (suprasternal notch): concave surface at the superior border
• body: main part of the sternum, articulates with rib pairs #2 through #7
  -sternal angle: transverse ridge between the manubriumand body which is an important clinical landmark for counting ribs to locate the second intercostal space when evaluating the heart
• Xiphoid process: the inferior part of the sternum, located at the fifth intercostal space