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Skeleton Fusion Times
Fusion Times in the skeleton
113
Anthropology
Graduate
10/30/2014

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Cards

Term
Occipital- Median sagittal suture and remains of sutura mendosa close
Definition
During year 1
Term
Occipital- Jugular process develops on pars lateralis
Definition
During year 1
Term
Fusion of pars lateralis to squama
Definition
1-3 years
Term
Occipital- Hypoglossal canal complete excluding pars basilaries
Definition
2-4 years
Term
Occipital- fusion of pars basilaris and pars lateralis
Definition
5-7 years
Term
Occipital- Fusion of spheno-occipital synchondrosis in females
Definition
11-16 years
Term
Occipital- Fusion of spheno-occipital synchondrosis in males
Definition
13-18 years
Term
Occipital- Closure of jugular growth plate
Definition
22-34 years
Term
Temporal- Petrous and Squamous portions parts fuse
Definition
During year 1
Term
Temporal- Growth of tympanic plate and formation of foramen of Huschke
Definition
1-5 years
Term
Mastoid process forming
Definition
1-5 years
Term
Sphenoid- lesser wings usually fused to body
Definition
Prenatal- month 5
Term
Sphenoid- Pterygoid plates fused to greater wings
Definition
Prenatal- Month 8
Term
Sphenoid- pre and postsphenoid parts of body usually fused together
Definition
Prenatal- month 8
Term
Sphenoid- greater wings fuse to body
Definition
during year 1
Term
Sphenoid- foramen ovale is completed
Definition
during year 1
Term
Sphenoid- Foramen spinosoum is completed
Definition
by year 2
Term
Sphenoid- Dorsum sellae ossified
Definition
by year 5
Term
Sphenoid- sphenoidadl conchae fuse to ethmoid
Definition
year 4-puberty
Term
Parietal- sagittal fontanelle usually is obliterated
Definition
Birth
Term
Parietal- takes on apperance of adult bone as eminence becomes less obvious
Definition
Childhood
Term
Frontal- Anterior Fontanelle closed
Definition
1-2 years
Term
Frontal- metopic suture normally closed
Definition
2-4 years
Term
Nasals- Adopts adult morphology and size
Definition
Puberty
Term
Nasals- superior border becomes serrated
Definition
about year 3
Term
Ethmoid- cribiform plate and crista galli ossify and fuse with labyrinths
Definition
1-2 years
Term
Ethmoid- ossified perpendicular plate reaches vomer and sphenoidal tail usually visible posteriorly
Definition
3-10 years
Term
Ethmoid- progressive expansion of ossification into nasal septum
Definition
10 years - Puberty
Term
Ethmoid- Ethmoid and Vomer fuse
Definition
20-30 years
Term
Inferior Nasal Concha- adult morphology except more wrinkled and processes are less developed
Definition
Birth
Term
Lacrimal- adult morphology
Definition
Birth
Term
Vomer- changes from u-shaped to y-shaped base
Definition
Prenatal - months 3-5
Term
Vomer- ossification of perpendicular plate of ethmoid toward vomer
Definition
3-10 years
Term
Vomer- edges of vomerine groove fuse to form canal
Definition
10 years- puberty
Term
Vomer normally fuses with perpendicular plate of ethmoid
Definition
20-30 years
Term
Zygomatic- adopts adult proportions with serrated frontal and temporal processes
Definition
2-3 years
Term
Zygomatic- marginal tubercle are palpable
Definition
2-3 years
Term
Maxilla- all permanent teeth emerged except third molar
Definition
by 12-14 years
Term
Maxilla- gradual increase in size of body of bone, increase in size of sinus, eruption and replacement of deciduous teeth
Definition
Infancy and Childhood
Term
Maxilla-  body and four processes identifiable
Definition
Prenatal-week 8
Term
Maxilla- maxillary sinus starts to develop
Definition
Prenatal- 10-12 weeks
Term
Palatine- orbital process starts to develop
Definition
Prenatal- week 10
Term
Palatine- adult morphology
Definition
Puberty
Term
Palatine- perpendicular plate starts to increase in height
Definition
From year 3
Term
Mandible- cornoid fuses with main mass
Definition
Prenatal week 8
Term
Mandible consists of separate right and left halves
Definition
Birth
Term
Mandible- fusion at symphysis
Definition
during year 1
Term
Mandible- increase in size and shape of bone and eruption and replacement of teeth
Definition
Infancy and Childhood
Term
Mandible- all permanent teeth emerged except third molar
Definition
by 12-14 years
Term
Mandible- Condylar and coronoid processes recognizable
Definition
Prenatal- about week 10
Term
Hyoid- body usually completely ossified
Definition
by year 2
Term
Hyoid- body and most of greater horns ossified
Definition
Puberty
Term
Ulna- distal epiphysis fuses in males
Definition
17-20 years
Term
Ulna- distal epiphysis fuses in females
Definition
15- 19 years
Term
Ulna- proximal epiphysis fuses in males
Definition
14-18 years
Term
Ulna- proximal epiphysis fuses in females
Definition
12-15 years
Term
Ulna- styloid process forms on distal epiphysis
Definition
8-10 years
Term
Ulna- secondary centers for olecranon appears
Definition
8-10 years
Term
Radius- distal epiphysis fuses in males
Definition
16-20 years
Term
Radius- distal epiphysis fuses in females
Definition
14-19 years
Term
Radius- flake for tuberosity may form as separate center
Definition
Puberty
Term
Radius- proximal epiphysis fuses in males
Definition
14-18 years
Term
Radius- distal epiphysis fuses in females
Definition
12-16 years
Term
Radius- proximal epiphysis shows foveal indentation
Definition
10-11 years
Term
Radius- styloid process forms on distal epiphysis
Definition
by year 8
Term
Radius- secondary center for head appears
Definition
year 5
Term
Radius- secondary center for distal epiphysis appears
Definition
1-2 years
Term
Humerus- secondary center for head appears
Definition
2-6 months
Term
Humerus- secondary center for capitulum usually appears
Definition
by year 1
Term
Humerus- secondary center for greater tubercle appears
Definition
6 months -2 years
Term
Humerus- secondary center medial epicondyle appears
Definition
4+ years
Term
Humerus- secondary center for lesser tubercle appears
Definition
4+ years
Term
Humerus- distal epiphysis fuses in males
Definition
16-21 years
Term
Humerus- distal epiphysis fuses in females
Definition
14-19 years
Term
Humerus- medial epicondyle fuses to shaft in males
Definition
16-18 years
Term
Humerus- medial epicondyle fuses to shaft in females
Definition
13-15 years
Term
Humerus- distal composite epiphysis joins shaft in males
Definition
14-18 years
Term
Humerus- distal composite epiphysis joins shaft in females
Definition
11-15 years
Term
Humerus- Secondary center for lateral epicondyle appears
Definition
year 10
Term
Humerus- secondary center for trochlea appears
Definition
by year 8
Term
Humerus- centers for head, greater and lesser tubercles fuse to form composite epiphysis
Definition
2-6 years
Term
Clavicle- becomes S-shaped
Definition
Prenatal 8-9 weeks
Term
Clavicle adopts adult morphology
Definition
Prenatal- Week 11
Term
Clavicle- fusion of flake commences at medial extremity
Definition
17-23 years
Term
Clavicle- medial epiphyseal flake forms
Definition
12-14 years
Term
Clavicle- lateral epiphysis may form and fuse
Definition
19-20 years
Term
Fusion of medial epiphysis will be complete in all individuals
Definition
29+ years
Term
Cervical Vertebrae- development of the anterior arch of the atlas
Definition
Year 2
Term
Cervical Vertebrae- ossification commences in ossiculum terminale
Definition
Year 2
Term
Cervical Vertebrae- Fusion of posterior synchondrosis in C3-7
Definition
Year 2
Term
Cervical Vertebrae- Foramen transverse complete
Definition
3-4 years
Term
Cervical Vertebrae- midline sulcus on posterior surface of dens in process of filling in
Definition
3-4 years
Term
Cervical Vertebrae- Fusion of posterior synchondrosis of axis and dentoneural synchondrosis
Definition
3-4 years
Term
Cervical Vertebrae- neurocentral fusion in C3-7
Definition
3-4 years
Term
Cervical Vertebrae- Posterior fusion of atlas
Definition
5-6 years
Term
Cervical Vertebrae- axis complete, apart from fusion of ossiculum terminale
Definition
5-6 years
Term
Cervical Vertebrae- anterior arch of atlas fuses
Definition
5-6 years
Term
Cervical Vertebrae- Dens complete following fusion of ossiculum terminale
Definition
By year 12
Term
Vertebral column complete
Definition
25+ years
Term
Heads of metacarpals 2-5 fuse in males and females
Definition

14.5-15 years - females

16.5 - males

Term
Base of metacarpal 1 fuses in males and females
Definition

14-14.5 - females

16.5 - males

Term
Proximal and middle phalangeal epiphysis fuse in females and males
Definition

14-14.5 - female

16.5 - males

Term
Distal phalangeal epiphysis fuse in males and females
Definition

13.5 years - females

16 years- males

Term
Carpals- Pisiform can be recognized in a dry bone state
Definition
12 years
Term
Carpals- hook of hamate appears and fuses to body
Definition
10-12 years
Term
Scaphoid can be recognized in a dry bone state
Definition
9.5-11 years
Term
Trapezium, trapezoid, and lunate can be recognized in a dry bone state
Definition
9-10 years
Term
Triquetral can be recognized in a dry bone state in males and females
Definition

8 years- female

10 years- males

Term
Carpals- Hamate can be recognized in a dry bone state in males and females
Definition

4 years- females

5 years - males

Term
Carpals- Capitate can be recognized in dry bone state in males and females
Definition

3 years- female

4 years- male

Term
Scapula- fusion complete at both inferior angle and along medial border; all scapular epiphyses fused
Definition
by 23 years
Term
Scapula- fusion of acrominal epiphyses complete in males and females
Definition

15-17 females

17-20 males

Term
Scapula- fusion complete between coracoid, subcoracoid, body of scapula and glenoid
Definition
15-18 years
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