1. Muscular System

2. “Anterior muscle attachments & Actions”

3. “Origin and insertion"
Origin – where the fixed (non-moving) end of the muscle attaches to the bone (cartilage or connective tissue)
Insertion – where the movable end of the muscle attaches to another structure

4. Temporalis
Origin: Temporal Bone
Insertion: Mandible
Movement (Action):
Closes Jaw (chew)

5. Orbicularis Oculi Origin: Frontal Bone and Maxilla
Insertion: Tissue around the eye
Movement (Action):
Blinks and Closes Eyes

6. Orbicularis Oris (kissing muscle) Origin: Mandible and Maxilla
Insertion: Skin and muscles around the mouth
Movement (Action):
Closes and protrudes lips
(kissing muscle)

7. Masseter Origin: Zygomatic Bone Insertion: Mandible
Movement/Action: closes jaw

8. zygomaticus Origin: Zygomatic Bone
Insertion: skin and muscle at corner of lips
Movement/Action: Raises corner of the mouth to smile

9. Sternocleidomastoid
Origin: sternum and clavicle
Insertion: mastoid process of temporal bone
Movement/Action: flex and laterally rotates neck

10. Pectoralis major Origin: sternum and clavicle Insertion: humerus
Movement:
flexes shoulder,
medially rotates arm,
adducts arm

11. Pectoralis Minor Origin: 3rd – 5th ribs Insertion: Scapula
Movement/Action: stabilizes the scapula against the thoracic wall

12. Deltoid Origin: clavicle, spine of scapula Insertion: humerus
Posterior View
Anterior View
Origin: clavicle, spine of scapula
Insertion: humerus
Movement/Action:
flexion,
abduction,
extension of shoulder

14. Biceps Brachii Origin: scapula Insertion: radius
Movement: flexes and supinates forearm

15. External oblique
Origin: lower 8 ribs
Insertion: ilium (iliac crest)
Movement: flexion at the hips and spine

16. Insertion: sternum and 5th-7th rib
Rectus Abdominis
Origin: pubis
Insertion: sternum and 5th-7th rib
Movement/Action:
Flexes vertebral column

17. Transverse Abdominis
Origin: Costal Cartilage, ilium
Insertion: Pubic
Movement/Action: helps in expiration