Understanding the Anatomy of a Crochet Stitch

Your confidence-building guide to mastering the basics!

If you’re new to crochet, you might be puzzled by terms like “insert your hook” or “yarn over.” Don’t worry, I’ve got you! Learning to crochet is a journey, and one of the very first steps toward feeling confident is understanding the anatomy of a crochet stitch.

Knowing the parts of a stitch is just as important as getting familiar with your yarn and crochet hook. Once you understand how a stitch is built, reading patterns becomes easier, your tension improves, and suddenly the whole craft feels a lot less mysterious.

In this guide, we’ll gently walk through the anatomy of a single crochet stitch – the foundation of amigurumi and one of the most essential stitches you’ll ever learn.

The Basics: What Is a Crochet Stitch?

A crochet stitch is created by forming and interlocking loops of yarn using a crochet hook. There are many different stitch types in crochet, but the single crochet (called a double crochet in UK terminology) is one of the most fundamental.

Single crochet stitches are used everywhere – from blankets and garments to amigurumi, the adorable crocheted toys and characters loved by crafters worldwide.

A single crochet stitch has these main parts:

• Front loop
• Back loop
• Post
• Back bump / back bar
• Base (the stitch you worked into)

When viewed from above, the two top loops form a little “V” – a key visual marker you’ll soon be able to identify instantly.

The Parts of a Single Crochet Stitch

Let’s take a closer look at each part and what it means for your crochet.

FRONT LOOP (FL):
This is the top loop of the stitch closest to you as you hold your work. Patterns may say FLO (front loop only), meaning insert your hook under this loop alone. Working through the front loop creates a subtle ridge on the back (wrong side) of your work.

BACK BUMP (BACK BAR):
The back bump is located directly behind the back loop. When you work into the back bump of foundation chains, it creates a clean, tidy edge with a row of “V” shapes along the bottom of your fabric.
This method is widely used for producing a more polished, professional look.

Right Side vs Wrong Side in Amigurumi 

Amigurumi is typically crocheted in continuous spirals, which naturally creates two distinct sides of the fabric:

Right Side (Front Side)

• Smoother
• More consistent texture
• The preferred outward-facing side for amigurumi
• Makes invisible decreases blend seamlessly

Wrong Side (Back Side)

• Slightly bumpier
• Shows the back bumps of the stitches
• Appears “inside out” compared to the right side

I almost always turn my amigurumi pieces so the right side faces outward – this gives the finished toy a clean, polished look and helps maintain uniform shaping. Occasionally, if I’m aiming for a unique texture, I’ll intentionally use the wrong side facing out instead.

In the following photos, you can see the “right” and “wrong” sides of single crochet stitches worked in rounds. I have demonstrated both the “V” single crochet (yarn over) and “X” single crochet (yarn under) techniques.

If you are not familiar with the “X” single crochet technique or would like more information on this topic, check out my Two Ways to Single Crochet tutorial.

Inserting Your Crochet Hook

Unless otherwise stated, inserting your hook means:

Insert under both top loops (front and back loop). This produces a standard, sturdy, traditional single crochet.

But you can change textures by inserting your hook differently:

• Front Loop Only (FLO): creates a flexible, rib-like effect.
• Back Loop Only (BLO): forms distinct ridges and improves flexibility.
• Back Bump: used mainly when working into foundation chains for stunningly clean edges.

Yarning Over (YO)

The yarn over is another fundamental part of creating a stitch. It involves wrapping the yarn over your hook from back to front. This action is essential for forming new loops on your hook, which will then be pulled through existing loops to create stitches.

Yarning Under (YU)

Yarning under means wrapping your yarn from front to back under the hook. This motion slightly twists the loop as it forms, resulting in a tighter, denser stitch. It’s the key technique behind the “X” single crochet that many amigurumi makers love for its firm, pixel-like texture – perfect for creating well-shaped, sturdy crochet toys. Read more about the “X” single crochet HERE.

How to Complete a Single Crochet Stitch

To complete a single crochet stitch, follow these steps:

1. Insert your hook into the stitch (typically under both top loops).
2. Yarn over and pull through the stitch. You now have 2 loops on your hook.
3. Yarn over again and pull through both loops on your hook. You’ve now completed one single crochet stitch.

Practice Makes Perfect

Understanding the anatomy of a crochet stitch can make a significant difference in your crochet journey. Take time to practice identifying and working with each part of the stitch. As you become more comfortable, you’ll find that your speed and confidence in crocheting will grow.