How to make an articulated hand {with cool movable fingers}

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Jewel's articulated hand with fingers that bend

Jewel and I made this cool articulated hand! But before I show you how to make one for yourself, let me tell you a little story explaining why.

A few months ago, Jewel fell over awkwardly and cut her little finger. It was a small cut, but something about it felt wrong. It just looked… strange. So after some deliberation, we decided to take Jewel to the hospital. It was evening by then, and the emergency department was busy with broken limbs, head injuries, suspected heart attacks, and goodness knows what else. So I felt about the size of an ant when I presented my 5.5 year old daughter with a tiny cut on her pinky finger.

The nurses ummed and ahhed. The doctors ummed and ahhed. The hand surgeons ummed and ahhed. The cut was in a tricky spot. No one wanted to send us home, just in case.

Jewel went into surgery the next day. As it turned out, Jewel had somehow managed to sever two tendons, a nerve and an artery, all in that tiny, not-even-1cm cut on her pinky finger. And that is the story behind why Jewel is interested in hand anatomy just now, and why we decided to make an articulated model of a human hand.

Jewel made this first (above) hand model, with a little help from me. It helps demonstrate how tendons work inside your hand, and how severing tendons could affect more than just that one joint.

I made a second hand, with a few minor modifications and the fingers now bend really well.

How to make an articulated model of a hand by Go Science Kids

Suitable for

This craft is a tad fiddly. 5-6 year olds, like Jewel here, will likely need some help. Older kids might be able to do it by themselves.

* Affiliate links are included to similar products as those used.

How to make an articulated hand

We used:

Step 1: Trace your hand on craft foam, and cut it out.

Trace and cut out your hand

Step 2: Cut paper straws into small pieces, and stick them on the hand and fingers to represent the bones and the tendon sheaths that are attached to them. (Leave gaps between each piece, as this will allow the fingers to bend later.)

Feel your hand and see if you can work out where the major bones are. We discovered there should be three small bones for each finger, and only two for the thumbs. Each set of finger and thumb bones connect up to corresponding longer bones in main part of the hand.

Jewel chose to attach her straws with small pieces of sticky tape. You could also use glue if you prefer.

Making an articulated hand model

Hint: when I re-did this step for our second hand, I discovered it is better if you leave a larger gap between the straws (as you can see below). This made a huge difference in how well the fingers bent later on.

Making a second articulated hand model

Step 3: Tie beads to five long pieces of twine. Thread each piece of twine through the straws on the finger and thumb, into the corresponding straws in the hand.

We used pony beads, but any beads would work, as long as they are large enough to not fit through the straw openings.

Make sure your twine is long enough so that you can easily pull on the other ends at the wrist. If in doubt, make them longer. You can always shorten them later on.

Adding string to represent tendons

Step 4: Tie a further five beads to the other ends of the twine. This stops you needing to worry about the twine falling out later on.

Creating an articulated hand model with craft foam, paper straws, string and beads

Step 6. Turn your hand over, and paint fingernails.

Painting the fingernails

Step 7: Tape a chopstick to the palm to act as a handle.

This makes it much easier to be able to hold and manipulate the hand.

Making articulated hand models

And now, have fun playing with your new hand! How many fingers am I holding up?

how to make a model articulated hand - fun biology science for kids

Hand Anatomy

There are 3 bones in each of your fingers, and 2 in your thumb. These bones are called phalanges. The phalanges connect to 5 bones in the main part of your hand, called metacarpals. (There are also 8 bones in your wrist called carpals, which aren’t featured in our craft.)

The muscles that move your fingers and thumb are in your forearm. Long flexor tendons extend from these forearm muscles through your wrist and palm to your fingers and thumb. The tendons slide though a snug tunnel, called the tendon sheath, which is attached to the little bones in your fingers and thumb and keep the tendons in place. When the muscles in the forearm contract, they pull on these tendons to move the bones.

The straws in our craft represent these tendon sheaths, and the twine represents the tendons. Because the tendons are connected from forearm to fingertip, if you sever a tendon at a lower joint, like Jewel did, it breaks the connection to the upper part of the finger as well.

Also in your hand are arteries and veins that transport blood to and from your fingertips. And there are nerves that allow you to feel what your hands and fingers are touching. Hands are such wonderful things!

how to make a model articulated human hand - fun biology science for kids

If you’d like to see the difference that the extra gaps between the straws makes, have a look at these two shots below – the top one is Jewel’s original hand, and the second one is the one I made with larger gaps, which can bend much further.

Bending a finger on Jewel's articulated hand

Bending the finger on the second articulated hand model - and noticing the difference the extra gaps make

Afterwards, Jewel took full advantage of the free access she had to the usually off-limits nail polish, and added crazy designs to her model hand. Fun! I love her artistic mind. 🙂

Jewel adding crazy nailpolish designs to her hand model

(In case you’re wondering, the main nailpolish we used is Covergirl Outlast Stay Brilliant Nail Gloss in Grapevine – not that we’re #fashionbloggers, lol).

* This post contains affiliate link(s). An affiliate link means I may earn referral / advertising fees if you make a purchase through my link, without any extra cost to you. It helps to keep this little project afloat. Thank you for your support.

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12 Comments

  1. Erin @Nourishing My Scholar

    Wow! This is so cool! I can’t wait to make a movable hand with my 8 year old!!!

    Reply
  2. Brenda

    I work with second, third, and fourth graders After School Tutoring. And on Thursday we have Stem classes. I can’t wait to do this one with them. They are going to love it.

    Reply
  3. Patricia Villamil

    Amazing! I’m trying this very soon!

    Reply
  4. Rebecca Smith

    This is so cool! I’m using this for our human body unit this month. My girls are going to love this, especially the painting the fingernails part. Thank you for the detailed instructions.

    Reply
  5. Natalie

    Hi. His looks super fun. Are paper straws absolutely necessary?

    Reply
  6. Kim

    I love this idea. I am volunteering at my daughters school Halloween party this year. I’m going to use this as one of the crafts. I will use black form paper and white straws to look like skeleton bones. Can’t wait! Thanks for the idea!!

    Reply

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