Quiz 5 - Ossification Centers

Question 1

calcaneus: primary oss

Answer 1

3rd month in utero

Question 2

calcaneus: secondary oss

Answer 2

Posterior part - 6-8 years

Question 3

calcaneus: fusion

Answer 3

14-17 years

Question 4

talus: primary oss

Answer 4

6th month in utero

Question 5

can talus have multiple oss centers?

Answer 5

lateral tubercle (often) and medial tubercle (sometimes) have separate oss centers

Question 6

navicular: primary oss

Answer 6

3 y/o

Question 7

what is the LAST tarsal bone to begin ossification?

Answer 7

navicular

Question 8

cuboid: primary oss

Answer 8

birth - 6 months

Question 9

medial cuneiform: primary oss

Answer 9

2 y/o

Question 10

which cuneiform can have multiple primary oss centers?

Answer 10

medial cuneiform (may have 2 centers- 1 dorsal and 1 plantar)

Question 11

intermediate cuneiform: primary oss

Answer 11

3 y/o

Question 12

lateral cuneiform: primary oss

Answer 12

1 y/o

Question 13

order of cuneiform ossification

Answer 13

Look mom, upside down I! (lateral, medial, intermediate)

Question 14

1st metatarsal: primary oss

Answer 14

10 wk in utero

Question 15

1st MT: secondary oss

Answer 15

Base, 3 y/o

Question 16

1st MT: fusion

Answer 16

17-20 y/o

Question 17

Which MT can have a separate oss center for the head?

Answer 17

1st MT

Question 18

2nd MT, 3rd MT, 4th MT: primary oss

Answer 18

9 wk in utero

Question 19

2nd MT, 3rd MT, 4th MT: secondary oss

Answer 19

head, 3-4 y/o

Question 20

2nd MT, 3rd MT, 4th MT: fusion

Answer 20

17-20 y/o (same as MT1, MT5)

Question 21

5th MT: primary oss

Answer 21

10 wk in utero

Question 22

5th MT: secondary oss

Answer 22

head, 3-4 y/o

Question 23

5th MT: fusion

Answer 23

17-20 y/o

Question 24

fusion of all MTs?

Answer 24

17-20 y/o

Question 25

which MTs have secondary ossification center of the head at 3-4 y/o?

Answer 25

MT 2, 3, 4, & 5

*MT 1’s BASE develops in 3rd year

Question 26

Where can 5th MT have separate oss center?

Answer 26

tuberosity

Question 27

Proximal phalanges: primary oss

Answer 27

11-15 weeks in utero

Question 28

proximal/ middle/ distal phalanges: secondary oss

Answer 28

base, 2-8 years

Question 29

proximal/middle/ distal phalanges: fusion

Answer 29

15-18 y/o

Question 30

middle phalanges: primary oss

Answer 30

variable, but after 15th week in utero

Question 31

distal phalanges: primary oss

Answer 31

9-12 weeks in utero

Question 32

order of primary oss centers of phalanges?

Answer 32

DPM

distal: 9-12 wks, proximal: 11-15, middle: 15+ weeks

Question 33

sesamoids in flexor hallucis brevis: primary oss center

Answer 33

10-12 years old

Question 34

how many oss centers are in sesamoids?

Answer 34

either medial or lateral sesamoid can have 2 centers; but they are more common in the MEDIAL sesamoid