Here are several arrangements of motor neurons, from a single neuron to a frame and a border 3 neurons wide. The single neuron will fit into a 5x7 hoop;the borders require large or jumbo hoops. Resizing will eliminate details, and probably will not work. Three letter monograms are good in the frame; the borders would be nice down the placket of a blouse or the wide binding of a bathrobe for your favorite neuroscientist.
Can't help myself: a little neurochemistry with your embroidery. Serotonin, also known as 5HT (5-hydroxytryptamine) is a major neurotransmitter involved in mood regulation and sleep. Levels go up at night. Milk and turkey are good sources of the molecules you need to make 5HT, so that night time glass of warm milk is not a bad idea. Here are a single labelled molecule (4x4) and a border (extra large). You can see the border stitched out on the Other page.
Opposed to 5HT, serum cortisol levels go up in the morning. These molecules are not labelled - there are too many rings. You can now make a set of very spiffy bed linens that require footnotes.
DNA/RNA BASES
PHRENOLOGICAL HEAD