EMBRYOLOGY OF THE ANTERIOR THORAX

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

What are the locations of the primary centers of ossification in the corpus sterni?

Answer 3

one in each of the first two sternabrae and bilateral centers in the last two sternabrae

Question 4

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

Answer 4

the xiphoid process

Question 5

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

Answer 5

the body

Question 6

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

Answer 6

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

Question 7

Which ribs will demonstrate primary centers of ossification for the body?

Answer 7

all ribs; ribs 1-12

Question 8

Which ribs will demonstrate secondary centers of ossification?

Answer 8

ribs 1-10

Question 9

How does rib 1 differ in ossification centers from typical ribs

Answer 9

rib 1 has two secondary centers of ossification: one for the head and one for the tubercle; typical ribs have three secondary centers of ossification

Question 10

How do ribs 11 and 12 differ in ossification centers from typical ribs?

Answer 10

ribs 11 and 12 do not have secondary centers of ossification