<prompt> Floor of posterior triangle of neck is formed bySemispinalis capitis, elevator scapulae, scalenus anterior, scalenus mediusLevator scapulae, splenius capitis, scalenus medius, scalenus anteriorSemispinalis capitis, scalenus anterior, splenius capitis, sternocleidomastoidLevator scapulae, scalenus posterior, semispinalis capitis,scalenus medius  <response>: Muscles forming floor of posterior triangle of neck : Semispinalis capitis. Splenius capitis. Levator scapulae. Scalenus posterior. Scalenus medius. 