Anatomy, keeping it simple...
The pelvic floor muscles are like a basket of muscles 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 - 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.
The pelvic floor is made up of several muscles that form a basket-like structure, higher at the back than the front.
The pelvic floor muscles are the coccygeus and the levator ani muscle group with includes the iliococcygeus, pubococcygeus and puborectalis.
Left and right sides are a mirror image.
The anus lies midline between the pelvic floor muscles.
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, providing the solid foundation necessary for pain-free movement.
Finding your body's Base-Line and working with your 'core pillar of strength' is the starting step to better physical health.
Picture your pelvic floor muscles in your mind.
Imagine them contracting and feel for them working.
It will take time to learn to fully activate your pelvic floor muscles if you are not used to using them.
Keep looking at the anatomy pictures and read up about Kegel exercises to get you started. Use several sources to find the info that works for you!
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 to improve your posture.
As well as the pelvic floor muscles there are other muscles and many connective tissue structures (fascia, tendons, ligaments etc) within the pelvis.
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 so much pain for so many people.