Origins and Insertions Flashcards
What are origins and insertions?
Points of muscle attachments on a bone
Define origin
The bone where the muscle anchors to
Define insertion
the bone the muscle is going to move
What happens during contraction?
Muscles pull
What do insertions do?
Insertions move towards origin
Pectoralis Major origin, insertion, and body part moved
Origin: sternum
Insertion: Tubercle of humerus
Body part moved: Arm
Deltoid origin, insertion, and body part moved
Origin: pectoral girdle
Insertion: Deltoid tuberosity of humerus
body part moved: Arm
Tricep Brachii origin, insertion, and body part moved
Origin: Posterior humerus
Insertion: Olecranon of Ulna
Body part moved: forearm
Gluteus maximus origin, insertion, and body part moved
Origin: illium
Insertion: gluteal tuberosity of femur
body part moved: thigh
Rectus abdominis origin, insertion, and body part moved
Origin: pubis
Insertion: Lower ribs (xiphoid process of sternum)
Body part moved: torso and spine