Human Heart

Skill level:

Tools and materials:

Size 4.0mm or 4.5mm crochet hook
Worsted weight yarn in two colors
6mm black plastic snap-in eyes
Stuffing
Stitches Used:
Yarn and/or tapestry needle
ch = chain
Scrap yarn for embroidery
sc = single crochet
Stitch marker (I use a small scrap of yarn)
sc dec = single crochet decrease
Black fabric paint
slp st = slip stitch

Other Abbreviations:
2x, 3x, etc = 2 times, 3 times, etc
rep *-* = repeat the instructions
inside of the asterisks the indicated
number of times.
PM = place marker
FO = finish off
sts = stitches
rnd = round

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 DO NOT JOIN ROUNDS WITH A SLIP STITCH OR CH 1 AT BEGINNING OF ROUNDS. USE
A STITCH MARKER TO MARK YOUR PLACE.

Main “Body”
( left / right atriums and ventricles )
With worsted weight yarn, ch 3

1. 2 sc in 2nd ch from hook, 4 sc in last ch, turning your work so you’re working along the
bottom of the chain, 2 sc in same ch as first 2 sc (8)
2. *2 sc, sc in next sc* rep *-* 4x (12)
3. *2 sc, sc in next 2 sc* rep *-* 4x (16)
4. *2 sc, sc in next 3 sc* rep *-* 4x (20)
5. sc in 1st 9 sc, *2 sc, sc in next 4 sc* rep *-* 2x, sc in last sc (22)
6. *2 sc, sc in next 4 sc* rep *-* 4x, sc in last 2 sc (26)
7. sc in 1st 14 sc, *2 sc in next sc, sc in next 3 sc* rep *-* 2x, sc in last 4 sc (28)
8. *2 sc, sc in next 5 sc* rep *-* 4x, 2 sc in next sc, sc in last 3 sc (33)
9. sc in 1st sc, *2 sc, sc in next 6 sc* rep *-* 4x, 2 sc in next sc, sc in last 3 sc (38)
10. sc in 1st 22 sc, *2 sc in next sc, sc in next 4 sc* rep *-* 2x, sc in last 6 sc (40)
11. sc in 1st 3 sc, *2 sc, sc in next 5 sc* rep *-* 2x, sc in last 25 sc (42)
12. sc in 1st 7 sc, 2 sc in next sc, sc in next 15 sc, *2 sc in next sc, sc in next 5 sc* rep *-* 3x,
sc in last sc (46)
13-15. sc in each sc around (46)
16. sc in 1st sc, *sc dec, sc in next 5 sc* rep *-* 3x, sc in last 24 sc (43)
Put the snap-in eyes between rounds 7-8. Your stitch marker is at the back of the heart:
the eyes will go on the front.
17. sc in 1st sc, *sc dec, sc in next 4 sc* rep *-* 2x, sc dec,
sc in next 6 sc, [sc dec, sc in next 5 sc] rep [ - ] 3x, sc in
last sc (37)
18. sc in each sc around (37)
19. *sc dec, sc in next 3 sc* rep *-* 3x, sc in last 22 sc (34)
20. sc in each sc around (34)
21. *sc dec, sc in next 2 sc* rep *-* 8x, sc in last 2 sc (26)
STUFF the heart firmly
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 22. *sc dec, sc in next sc* rep *-* 8x, sc dec (17)
23. sc in 1st sc, *sc dec, sc in next sc* rep *-* 5x, sc in last sc (12)
STUFF the heart again, to fill out the top
24. sc dec around
FO, weave in the ends.

Pulmonary Veins
With main color, ch 24, join with a slip stitch (careful not to twist stitches) to form a ring.

1. sc in each ch around (23)

2. sc in 1st 7 sc, *sc dec, sc in next sc* rep *-* 3x, sc in last 7 sc (20)
3. sc in 1st 6 sc, *sc dec, sc in next sc* rep *-* 3x, sc in
next 3 sc, sc dec (16)
4. sc in 1st sc, sc dec, sc in next 3 sc, *sc dec, sc in next
sc* rep *-* 2x, sc in last 4 sc (13)
5a. sc in 1st 4 sc, ch 2, skip 6 sc, sc in last 3 sc (fig. 1) (7)
Top vein divergence started

6a. sc in 1st 4 sc, sc in each of the 2 ch, sc

in last 3 sc (9)
7a-8a. sc in each sc around (9)
Slp st in next sc, FO. Weave in this end only,
Figure 1 you’ll need the beginning tail for assembly.

Make a slipknot and place it on the hook.

5b. Reattach yarn to next sc of round 4, sc in next 6 sc (see fig. 2), sc in the bottom side of
each of the 2 ch from round 5 (fig. 3), PM (8)
6b-7b. sc in each sc around (8)
Slp st in next sc, FO. Weave both ends from this vein tube only.
2
 Figure 2 Figure 3

Superior Vena Cava

With main color, ch 23, join with a slip stitch
(careful not to twist stitches) to form a ring.

1. sc in each ch around (22)

2. sc in 1st 7 sc, *sc dec, sc in next sc* rep *-* 3x, sc in last
6 sc (19)
3. sc in 1st 6 sc, *sc dec, sc in next sc* rep *-* 3x, sc in next 3 sc, 2 sc in last sc (17)
4. sc in 1st sc, 2 sc in next sc, sc in next 3 sc, *sc dec, sc in next sc* rep *-* 3x, sc in next 2
sc, 2 sc in last sc (15)
5. sc in 1st sc, 2 sc in next sc, sc in last 14 sc (17)
6. sc in 1st sc, 2 sc in next sc, sc in next 3 sc, [sc dec] 4x, sc in last 4 sc (14)
7. sc in 1st 5 sc, [sc dec] 3x, sc in next 2 sc, slp st in last sc (10)
8. slp st in 1st 4 sc, sc in next 6 sc, slp st in last st (10)
Slp st in next sc, FO. Weave in this end only, you’ll need the beginning tail for assembly.

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 Pulmonary Artery
With main color, ch 17, join with a slip stitch
(careful not to twist stitches) to form a ring.

1. sc in each ch around (16)

2. sc dec, sc in last 14 sc (15)
3. sc dec, sc in last 13 sc (14)
4-6. sc in each sc around (14)
7. sc in 1st sc, sc dec, sc in last 11 sc (13)
8. *sc dec, sc in next 2 sc* rep *-* 2x, sc in last 5 sc (11)
9-10. sc in each sc around (11)
11a. sc in 1st 6 sc, ch 4, remove marker, skip 6 sc, sc in next 5 sc, sc in 1st ch, sc dec, sc in
last ch, PM (8)
Vein divergence started

12a. sc in 1st sc, slp st in next 4 sc, sc in

last 4 sc (7)
13a. sc in 1st sc, slp st in next 4 sts, sc in
last 4 sc (9)
14-21. sc in each sc around (9)
22. sc in 1st 4 sc, slp st in next sc, leave
last stitches unworked
FO. Weave in this end only, you’ll need the
beginning tail for assembly.

Make a slipknot and place it on the hook.

11b. Reattach yarn to next sc of round 10, sc in next 6 sc of round 10 (see fig. 4), sc in the
underside of each of the 4 ch from round 11a (fig. 5), PM (12)
12b. sc in 1st sc, slp st in next 4 sc, sc in next sc, [sc dec] 2x (8)
13b. sc in 1st sc, slp st in next 4 sts, sc in last 3 sc (8)
14-17. sc in each sc around (8)
Slp st in next sc, FO. Weave both ends from this vein tube only.

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 Figure 4 Figure 5

Aorta
With second color, ch 13, join with a slip stitch
(careful not to twist stitches) to form a ring.

1. sc in each ch around (12)

2-6. sc in each sc around (12)
7-8. slp st in 1st 6 sc, sc in last 6 sc (12)
9-10. sc in 1st st, slp st in next 6 sts, sc in last 5 sc (12)
11-12. sc in 1st 2 sts, slp st in next 6 sts, sc in last 4 sts (12)
13-15. sc in 1st 3 sts, slp st in next 6 sts, sc in last 3 sts (12)
16-17. sc in 1st 4 sts, slp st in next 6 sts, sc in last 2 sts (12)
18-19. sc in 1st 5 sts, slp st in next 6 sts, sc in last st (12)
20-21. sc in 1st 6 sts, slp st in next 6 sts (12)
22. sc in 1st 7 sts, slp st in next st
FO and weave in this end only. You’ll need the beginning tail for assembly.

5
Aorta Veins (make 3)

With second color, ch 10, join with a slip stitch

(careful not to twist stitches) to form a ring.

1. sc in each ch around (9)

2-3. sc in each sc around (9)
Slp st in next sc, FO. Weave in this end only, you’ll need the beginning tail for assembly.

Assembly
Now that we’ve got all our pieces, grab some pins and let’s start putting them together!

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 TIP:
Use the line formed by the ch 3 of
the main heart body as a centering
line when pinning on the pulmonary
veins and the superior vena cava
(the right and left sides respectively).

Using the pictures below, pin the pieces in place on the main heart body. The slip
stitch curve of the aorta will go over the long arm of the pulmonary artery.
Sew all of the pieces in place, weaving in the ends as you go. Since all of these pieces
are open-ended, we won’t be stuffing them.
Once all of these pieces are sewn on we can add the three aorta vein tubes.

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 When sewing the three little tubes
onto the aorta: before weaving in the
end of the tube closest to the heart
body, use it to tack the curve of the
aorta in place around the long arm
of the pulmonary artery. You can see
my tacking stitch that goes through
the gold aorta, the purple artery arm,
out through the opening of the aorta
and then back through before I wove in the end. You don’t have to pull this tight, this is
just to keep the curve curvy!

FINISHING TOUCHES!
Using a length of the yarn color you used for the aorta, stitch a branching vein from
between the pulmonary veins and the pulmonary artery down towards the eyes. I used
a chain stitch for this.
With fabric paint or a scrap of black yarn, add a little smile between the eyes.

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