Embryology: Sternum and Ribs

Question 1

How many primary centers of ossification appear in the manubrium?

Answer 1

1-3 centers have been identified

Question 2

How many primary centers of ossification appear in the corpus sterni?

Answer 2

typically 6

Question 3

In what part of the sternum will a secondary center of ossification appear?

Answer 3

the xiphoid process

Question 4

In what part of the rib will promary centers of ossification appear?

Answer 4

the body (corpus, shaft)

Question 5

In what parts of the rib will secondary centers of ossification appear?

Answer 5

the head, articular surface of the tubercle and the non-articular surface of the tubercle

Question 6

Which ribs will demonstrate secondary centers of ossification?

Answer 6

ribs 1-10

Question 7

Which ribs lack secondary centers of ossification?

Answer 7

ribs 11 and 12

Question 8

Which ribs demonstrate three secondary centers of ossification?

Answer 8

ribs 2-9

Question 9

Which ribs have only two secondary centers of ossification?

Answer 9

ribs 1 and 10