NUMBERS - Osteogenesis 6 weeks gestation Buccopharyngeal...

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Osteogenesis 6 weeks gestation Buccopharyngeal membrane seperates 21 weeks gestation Odontogenesis 6 th week gestation 9 weeks tooth bud forms Deciduous Permanent Mo.s 7 9 11 14 17 24 Teeth I 1 I 2 1 I 2 M 1 1 C M 2 2 Yrs 6 7 8 9 10 11 12 17-25 Teeth M1 I1 I2 PM1 PM2 C M2 M3
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FONTANELLE Posterior fontanelle 6 months Sphenoid/ Pterion fontanelle 6 months Anterior fontanelle 1 to 2 yrs Mastoid/ Asterion fontanelle 2 yrs Metopic/ frontal suture 2-4 yrs
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SYNOSTOSIS Occipital synostosis: lateral to squama 1 to 3 yrs Base to lateral 5 to 7 yrs Sphenoid occipital synochrondrosis: 17 to 25 yrs Sphenoid synostosis 1 yr of age
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TEMPORAL BONE Has 3 parts: Petros to squamous 1 yr of age Tympanic plate 5 yrs *when tympanic plate does not ossify foramen of Huschke (rare)
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MANDIBLE : fuses at 1 year of age SHOULDER, WRIST AND KNEE 17- 2O yrs (appear early, fuse late) ELBOW, HIP AND ANKLE 14-18 yrs (appear late, fuse early)
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