which is the longest muscle in human body
Sartorius muscle The sartorius muscle (/sɑːrˈtɔːri.əs/) is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment.[2]
Psoas major muscle The psoas major (/ˈsoʊ.əs/ or /ˈsoʊ.æs/) (from Greek: ψόας - psóās : 'of the loins', genitive singular form of ψόα - psóa 'the loins') is a long fusiform muscle located on the side of the lumbar region of the vertebral column and brim of the lesser pelvis. It joins the iliacus muscle to form the iliopsoas.