A 1-Month-Old Infant Has a Head Measurement of 34 Cm

question 24

Multiple Choice

A 1-month-old infant has a head measurement of 34 cm and has a chest circumference of 32 cm.The nurse would:

• A)refer the infant to a physician for further evaluation.
• B)consider this a normal finding for a 1-month-old infant.
• C)expect the chest circumference to be greater than the head circumference.
• D)ask the parent to return in 2 weeks to re-evaluate the head and chest circumferences.

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Definitions:

Myelin Layers

Myelin layers are protective coverings made of fatty substances that surround the axons of some neurons, facilitating the rapid transmission of electrical impulses along nerve cells.

Propagation Speed

The rate at which a wave, including sound, light, or electromagnetic waves, travels through a medium.

Action Potential

A brief change in the electrical charge of a neuronal membrane; the physical basis of the signal that travels the length of the neuron.

Excitation Threshold

The voltage difference between a neuron’s interior and exterior that, if exceeded, causes the neuron to fire.