Fontanelle of skull,special bones,ossification centres

Anterior Fontanelle of skull

• Also known as foramen bregma
• Between coronal and sagittal suture
• Closes by 18 months post birth

Posterior fontanelle of skull

• Between sagittal and lambdoid suture
• Closes by 4-5 months post birth

Overall there are 6 fontanelles in skull

Sesamoid bones

• Patella
• Fabella
• Pisiform

Pneumatic bones

• It is to reduce weight of bone
• Seen in most skull bones like 

Ethmoid,

Maxilla,

Sphenoid,

Frontal,

Mastoid

Dermal/membranous bones

• Facial bones
• Skull vault

Mandible has 6 ossification centres

Appearance of ossification centers :

• 7th week - femur
• 8th week - tibia,humerus,radius
• 2,3,4 months - illium , ischium , pubis