adductor magnus action

origin/insertion: sternoidocleidmastoid
location: frontalis
size: gluteus maximus
shape: deltoid
number of origins: biceps femoris

apologies for the confusion, but it seems like the information provided is not accurate. The adductor magnus is a large muscle located in the inner thigh. Its main actions are to adduct the thigh (bringing it towards the midline) and to help with hip extension. Its origin is on the ischial tuberosity of the pelvis and it inserts onto the femur. It is not related to the sternocleidomastoid muscle, frontalis, gluteus maximus, deltoid, or biceps femoris muscles.