Muscle Origin, Insertion, Action

Here’s a quick breakdown of the origin (O), insertion (I), and action (A) of the muscles you’ve mentioned:

1. Frontalis

   • O: Epicranial aponeurosis

   • I: Underneath skin of forehead

   • A: Raises eyebrows

2. Occipitalis

   • O: Occipital bone

   • I: Epicranial aponeurosis

   • A: Retracts scalp

3. Orbicularis Oculi

   • O: Frontal bone

   • I: Skin around eyes

   • A: Blinking

4. Orbicularis Oris

   • O: Tissue surrounding lips (maxilla)

   • I: Skin at corners of mouth

   • A: Puckers lips

5. Zygomaticus Major

   • O: Zygomatic bone

   • I: Skin at corners of mouth

   • A: Smiling

6. Temporalis

   • O: Temporal bone

   • I: Mandible

   • A: Closes mouth

7. Sternocleidomastoid

   • O: Sternum and clavicle

   • I: Mastoid process

   • A: Tilts head to the side

8. Trapezius

   • O: Occipital bone

   • I: Clavicle

   • A: Elevates shoulder

9. Latissimus Dorsi

   • O: Thoracic vertebrae

   • I: Humerus

   • A: Extends humerus

10. Pectoralis Major

    • O: Clavicle

    • I: Greater tubercle of humerus

    • A: Brings elbows together

11. Pectoralis Minor

    • O: Ribs

    • I: Scapula

    • A: Rotates shoulder anteriorly

12. Deltoid

    • O: Clavicle

    • I: Deltoid tuberosity of humerus

    • A: Lifts arm at shoulder

13. Biceps Brachii

    • O: Coracoid process

    • I: Radial tuberosity

    • A: Flexes elbow

14. Brachialis

    • O: Anterior surface of humerus

    • I: Coracoid process of ulna

    • A: Flexes elbow

15. Triceps Brachii

    • O: Scapula

    • I: Ulna

    • A: Extends forearm

16. Rhomboid Major

    • O: Thoracic vertebrae

    • I: Scapula

    • A: Stabilizes scapula

17. Rhomboid Minor

    • O: Cervical and thoracic vertebrae

    • I: Scapula

    • A: Stabilizes scapula

18. Gracilis

    • O: Inferior ramus

    • I: Tibia

    • A: Adducts thigh

19. Gluteus Maximus

    • O: Coxal bone

    • I: Femur

    • A: Extends hip

20. Rectus Femoris

    • O: Anterior inferior iliac spine

    • I: Tibial tuberosity

    • A: Extends knee

21. Vastus Lateralis

    • O: Greater trochanter

    • I: Tibial tuberosity

    • A: Extends knee

22. Vastus Medialis

    • O: Linea aspera

    • I: Tibial tuberosity

    • A: Kicking

23. Vastus Intermedius

    • O: Femur

    • I: Tibial tuberosity

    • A: Kicking

24. Tensor Fasciae Latae

    • O: Anterior superior iliac spine

    • I: Iliotibial tract

    • A: Opens thighs

25. Sartorius

    • O: Coxal bone

    • I: Knee joint

    • A: Allows crossing of leg

26. Biceps Femoris

    • O: Linea aspera of femur

    • I: Head of fibula

    • A: Flexes knee

27. Gastrocnemius

    • O: Femur

    • I: Posterior calcaneus

    • A: Plantar flexes foot

28. Soleus

    • O: Tibia

    • I: Posterior calcaneus

    • A: Plantar flexes foot

29. Diaphragm

    • O: Sternum

    • I: Central tendon

    • A: Inhalation and exhalation

30. Rectus Abdominis

    • O: Pubis

    • I: Sternum

    • A: Sitting up

31. Abdominal Obliques

    • O: Ribs

    • I: Linea alba

    • A: Twists waist

32. Transverse Abdominis

    • O: Ilium

    • I: Sternum

    • A: Squeezes abdomen