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Discuss how astronomers know that our galaxy contains spiral arms in its disk.
Nerve Plexus
A network of intersecting nerves providing sensory and motor control to various body parts, such as the brachial plexus which controls the arm.
Phrenic
pertains to the diaphragm, especially in the context of the phrenic nerve, which controls its movements.
Facial
Concerning treatments or care applied to the face, often for cosmetic or health reasons, emphasizing skin health and appearance.
Smile
A facial expression formed by flexing the muscles at the sides of the mouth, often expressing happiness or pleasure.
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