Developmental Changes

Question 1

Agenesis

Answer 1

Absence of an organ (usually paired organ)

Eg Renal, Testicular, Odontoid genesis

Question 2

Aplasia

Answer 2

Small remnants of the organ present (lack of development )

Eg posterior arch of atlas - severe lack of development

Question 3

Hypoplasia

Answer 3

Organ smaller than normal and USUALLY defective