Floor of posterior triangle of neck is formed by
Semispinalis capitis, elevator scapulae, scalenus anterior, scalenus medius Levator scapulae, splenius capitis, scalenus medius, scalenus anterior Semispinalis capitis, scalenus anterior, splenius capitis, sternocleidomastoid Levator scapulae, scalenus posterior, semispinalis capitis,scalenus medius