Human Osteology and Dental Development

Flashcards based on key concepts from human osteology and dental development. These cover skull dimensions, fontanelle closure times, dental eruption schedules, and age estimation through bone and teeth analysis.

What is the circumference of the skull in full-term infants?

13 inches.

At what age does the anterior fontanelle typically close?

18 months after birth.

What is the typical number of primary (milk) teeth in children?

20 teeth.

At what age do the first permanent molars erupt?

At 6 years of age.

What is the primary characteristic of milk teeth?

They are small, narrow, delicate, and white with serrated edges.

What suture closes at 40 years of age?

Coronal suture.

At what age does the epiphysis of the humerus unite with its shaft?

20 years.

How many permanent teeth do adults usually have?

32 teeth.

What is one method used to estimate age from teeth?

Attrition (eating up of the grinding surface).

What is the name of the suture that closes at puberty?

Y-shaped suture at the acetabulum.

At what age do the upper ends of the ulna and radius unite with their shafts?

21 years.

What happens to the mental foramen position from infancy to old age?

It moves from near the lower margin in infants to near the alveolar margin in old age.

What is the age of complete closure of all sutures in the skull, except for one?

At 70 years.

What tooth typically erupts first in infants?

Lower central incisors.

What is the order of appearance for permanent molars?

First molars at 6 years, second molars at 12 years, third molars at 18-25 years.

At what month does the calcaneus ossific center appear during intrauterine life?

5th month.

What are the signs of secondary dentin deposition related to age estimation?

Changes in the dental structure indicating aging.

What is the name of the lower end of the femur ossific center that reaches 5 mm by 9 months?

Lower end of femur.

At what age does the iliac crest unite with the iliac bone?

23 years.