Touching Thumbs

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One reason the thumb is unique among the fingers is the presence of only one joint instead of two.

1. nail field

2. right thumb

3. vein

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.

External Genitalia

The Hands

Touching Thumbs

Three-Month Fetus

Fingertips of Right Hand

Roof of the Mouth

3 months