(1.20)

Now we’re almost ready to move on, to Section Two of this tape. Before we do that, let’s briefly review what we’ve seen of the muscles of the back, and the contents of the vertebral canal.

Here are the short rotators, the long rotators, and the multifidus. Here’s the erector spinae: spinalis, longissimus thoracis, and iliocostalis lumborum.

Now the features of the vertebral canal: here’s the spinal cord, the dura, the arachnoid, the pia, the sub-arachnoid space, the epidural space. Here are the dorsal filaments, the dorsal root; the ventral filaments, and the ventral root.

Here’s the dorsal root ganglion, here's the spinal nerve, the anterior primary ramus, and the posterior primary ramus. Lastly, here’s the cauda equina.