These are muscles of the loins that aid in flexing and rotating the thigh
Psoas Minor (smallest) – only present in about half of the population. Not discussed further in this article.
Psoas Major (largest)
NB. Iliopsoas muscle – the Psoas Major and Iliacus are often combined and referred to as such. Their ends merge together and attach to the same place.
Psoas Major – Bottom of the spinal vertebrae attachment through finger-like projections of the muscle. It then goes down the spine, over the pubic bone and attaches to the lesser trochanter of the femur.
Iliacus – Broad attachments on the inside of the pelvic bowl. The fibres of the muscle then weave with the Psoas Major and attach in the same spot on the femur as the Psoas Major.
Important for posture
Effects how you move
Iliopsoas muscle – as these muscles share the same attachment it allows for the same movement (flexion and external rotation) when the muscles contract and shorten.
Breath & Energy
Powerful hip flexor
Lateral rotation and abduction of the hip
The Uddiyana bandha is located on the psoas.
Extended hand to big toe pose (Utthita Hasta Padangusthasana) – raising the leg to grab the toe requires the psoas to be engaged.
Boat pose (Navasana) – Psoas are engaged to keep the hips raised
The Psoas are one of the muscle groups around the hip. Read more about the Hip Joint in a separate article.
You can also read separate articles on other muscles around the hip joint:
The Deep Six Lateral Rotators
The Psoas (this article is one of the topics in the series)