Anatomy, keeping it simple...
The pelvic floor muscles are like a basket of muscle contained within the bones of the pelvis.
The bones of the pelvis and sacrum (the bottom of the spinal column) form a ring of bone. The hole in the middle is known as the pelvic canal.
The pelvic floor muscles span the pelvic canal, like a sling / hammock at the base of the torso.
At the front of the pelvis, the left and right pubic bones are joined by the pubic symphysis which is one of our 5 midline markers for alignment.
The shape of the pelvis and the pelvic canal differs between male and female.
The difference in shape of the pelvic canal means the size and shape of the pelvic floor muscles also differs between male and female.
For practical purposes, these differences do not matter. What matters is having sufficient activation your pelvic floor muscles, balanced between left and right sides.
The pelvic floor is made up of several muscles that form a basket-like structure, higher at the back than the front.
Left and right sides are a mirror image.
The anus lies midline, between the pelvic floor muscles.
The pelvic floor muscles consist of the coccygeus muscles and the levator ani muscle group (the iliococcygeus, pubococcygeus and puborectalis).
Correct usage of the pelvic floor muscles is central to a healthy, balanced body.
The pelvic floor muscles are the Base of your Base-Line muscles, your 'core pillar of strength'.
You pelvic floor provides the solid foundation necessary for pain-free movement.
Finding your body's Base-Line is the starting step to better physical health.
Keep looking at the anatomy pictures, and read up about Kegel exercises to get you started. Use several sources to find the information that clicks with you!
It will take time to learn to fully activate your pelvic floor muscles if you are not used to using them. Every time you try will make a positive difference, building the connection between body and mind.
Strive for a feeling of balance between left and right sides.
It should be possible to feel the activation of the pelvic floor muscles in all positions.
It will become easier the more you practice - so keep working at it.
As you focus on activating your pelvic floor muscles you will become more aware of the sensory feedback that they provide. This feedback is important for our sense of positioning and movement known as proprioception, and for feeling how to move in order to improve your posture.
As well as the pelvic floor muscles, there are other muscles and a lot of connective tissue structures (fascia, tendons, ligaments etc) in the pelvic region.
Knowing the anatomical details isn't important, but it's good to appreciate the complexity of the pelvic region to help understand why it is the source of pain for so many people.