appendicular muscles O/I/A

deltoid - origin

lateral third of clavicle, acromion, and spine of scapula

deltoid - insertion

deltoid tuberosity of humerus

deltoid - primary action

abduction of the arm

biceps brachii - origin (long head)

supraglenoid tubercle of scapula

biceps brachii - origin (short head)

coracoid process of scapula

biceps brachii - insertion

radial tuberosity of the radius

biceps brachii - primary action

flexion of the elbow

gluteus maximus - origin

ilium, sacrum, and coccyx

gluteus maximus - insertion

gluteal tuberosity of femur

gluteus maximus - primary action

extension of the hip

satorius - origin

anterior superior iliac spine

satorius - insertion

medial surface of proximal tibia

satorius - primary action

flexes, abducts, and laterally rotates hip; flexes knee

rectus femoris - origin

anterior inferior iliac spine

rectus femoris - insertion

tibial tuberosity of the tibia (via patellar ligament)

rectus femoris - primary action

extension of the knee and flexion of the hip

gastrocnemius - origin

medial and lateral condyles of femur

gastrocnemius - insertion

calcaneus (via calcaneal tendon)

gastrocnemius - primary action

plantarflexion of the foot and flexion of knee