Most Major Structural Birth Defects Are Due to Problems That

question 125

Multiple Choice

Most major structural birth defects are due to problems that occur:

• A)during the germinal stage of prenatal development
• B)during the fetal stage of prenatal development
• C)once the fetus has reached the age of viability
• D)during the embryonic stage of prenatal development

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Definitions:

Merkel Disks

Specialized skin cells that function as mechanoreceptors to sense touch and texture.

Pacinian Corpuscles

Specialized nerve endings in the skin and visceral organs sensitive to pressure and vibration.

Meissner Corpuscles

Specialized nerve endings found in the skin that are responsible for sensitivity to light touch.

Ruffini End Organs

Sensory receptors in the skin and fascia that detect stretch and twists, contributing to the kinesthetic sense and control of finger position and movement.