BONES OF THE UPPER LIMBS Flashcards
OSSIFICATION OF CLAVICLE
1ST BONE TO OSSIFY in the body except for medial end (ossifies in
membrane)
2 PRIMARY centre AND 1 SECONDARY centre
PRIMARY OSSIFICATION centre OF CLAVICLE
Appear at 5th to 6th weeks intrauterine AND Fuse at about 45th day
SECONDARY OSSIFICATION centre OF CLAVICLE
Appear at 15 to 17 years AND Fuse with shaft at 21-22 years
Female clavicle
shorter, lighter, thinner and smoother and less curved.
* Lateral end is a little below the medial end
OSSIFICATION OF SCAPULA
Ossifies from one primary centre and seven secondary centres
PRIMARY centre OF SCAPULA
Appear near glenoid cavity at 8th intrauterine
SECONDARY centre OF SCAPULA
1st: Appear during first year (middle of coracoid process)
2nd: Appears during 10th year (at root of coracoid)
3-7: Appear at puberty
1st: fuses by 15th year
2nd: fuses by 16-18 years
3 to 7: fuses by 25th yeaR
OSSIFICATION OF HUMERUS
Ossifies from one primary centre and seven secondary centres
primary centre OSSIFICATION OF HUMERUS
Appear near middle of diaphysis at 8th intrauterine
SECONDARY centre OSSIFICATION OF HUMERUS
1st (for head): Appears at first year
2nd (for greater tubercle): Appears at second year
3rd (for lesser tubercle): Appear at fifth year
Fuse at 6th year to form epiphysis of humerus which fuses with shaft at 20th year
1st (for capitulum and lateral flange of trochlea): Appears at first year
2nd (for medial flange of trochlea): Appears at 9th year
3rd (for lateral epicondyle): Appear at 12th year
Fuse at 14th year to form epiphysis of humerus which fuses with shaft at 16
th year
Centre for medial epicondyle: appears during 4-6 years
Forms separate epiphysis which fuse with shaft at 20th year
OSSIFICATION OF RADIUS
Ossifies from one primary centre and two secondary centres
primary centre OSSIFICATION OF RADIUS
Appear near middle of diaphysis at 8th intrauterine
SECONDARY centre OSSIFICATION OF
