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During heart formation, septation of the ventricles requires fusion of the mitral and tricuspid valves with the septum primum.

Fingers and toes are formed when cell death in apical ectodermal ridge occurs.

Achondroplasia, the most common cause of dwarfism, results from a mutation in the Wnt7 receptor.

Skeletal muscle is derived from splanchnic mesoderm which then differentiates into sclerotomes.

What part of the developing tooth is indicated by the tip of the arrow?

Ribs develop from the sclerotome portion of paraxial mesoderm.

In long bone development, a thin layer called periosteum covers early bone formation.

Muscles develop by the process of membranous ossification.

The cortex of the suprarenal glands arises from mesenchyme while the medulla arises from neural crest.

Which of the following indicates homologous structures (originating from the same embryologic structure) in the male and female external genitalia?