Quiz 5 - Ossification Centers Flashcards
calcaneus: primary oss
3rd month in utero
calcaneus: secondary oss
Posterior part - 6-8 years
calcaneus: fusion
14-17 years
talus: primary oss
6th month in utero
can talus have multiple oss centers?
lateral tubercle (often) and medial tubercle (sometimes) have separate oss centers
navicular: primary oss
3 y/o
what is the LAST tarsal bone to begin ossification?
navicular
cuboid: primary oss
birth - 6 months
medial cuneiform: primary oss
2 y/o
which cuneiform can have multiple primary oss centers?
medial cuneiform (may have 2 centers- 1 dorsal and 1 plantar)
intermediate cuneiform: primary oss
3 y/o
lateral cuneiform: primary oss
1 y/o
order of cuneiform ossification
Look mom, upside down I! (lateral, medial, intermediate)
1st metatarsal: primary oss
10 wk in utero
1st MT: secondary oss
Base, 3 y/o
1st MT: fusion
17-20 y/o
Which MT can have a separate oss center for the head?
1st MT
2nd MT, 3rd MT, 4th MT: primary oss
9 wk in utero
2nd MT, 3rd MT, 4th MT: secondary oss
head, 3-4 y/o
2nd MT, 3rd MT, 4th MT: fusion
17-20 y/o (same as MT1, MT5)
5th MT: primary oss
10 wk in utero
5th MT: secondary oss
head, 3-4 y/o
5th MT: fusion
17-20 y/o
fusion of all MTs?
17-20 y/o
which MTs have secondary ossification center of the head at 3-4 y/o?
MT 2, 3, 4, & 5
*MT 1’s BASE develops in 3rd year
Where can 5th MT have separate oss center?
tuberosity
Proximal phalanges: primary oss
11-15 weeks in utero
proximal/ middle/ distal phalanges: secondary oss
base, 2-8 years
proximal/middle/ distal phalanges: fusion
15-18 y/o
middle phalanges: primary oss
variable, but after 15th week in utero
distal phalanges: primary oss
9-12 weeks in utero
order of primary oss centers of phalanges?
DPM
distal: 9-12 wks, proximal: 11-15, middle: 15+ weeks
sesamoids in flexor hallucis brevis: primary oss center
10-12 years old
how many oss centers are in sesamoids?
either medial or lateral sesamoid can have 2 centers; but they are more common in the MEDIAL sesamoid
