(a) What are visceral bones ? Give atleast two examples.
(b) What are membrane bones ? Give two examples.

Explanation

(a) Visceral bones are formed in the soft organs. Examples : os cordis in the heart of ruminants, os penis in the penis of most bats.
(b) Membrane bones are formed by ossification in the dermis of skin as thin plates, which sink to get attached over the original cartilaginous endoskeleton which gets covered. Examples : Parietals and frontals of the skull.