1. How Muscles are NAMED
3 Major Naming Criteria

2. 1. Direction of Muscle Fibers
Note a muscle FIBER is a muscle CELL. Skeletal muscle fibers are long and skinny like sticks.

3. 1. Direction of Muscle Fibers
Orbicularis: circular
Rectus: straight
Oblique: slanted

4. 2. Size or Shape of Muscle Deltoid: triangular
Trapezius: pair of triangles (like a diamond)

5. 2. Size or Shape of Muscle Major: larger Minor: smaller
Pectoralis Major
Pectoralis Minor

6. 2. Size or Shape of Muscle Maximus: large Longus: Long Brevis: Short
Gluteus Maximus
Fibularis
LONGUS
Fibularis
BREVIS

7. 3. Location of the Muscle Region of the human body:
Biceps brachii – located in ARM
Biceps femoris – located in THIGH
Rectus abdominis = located in ABDOMEN  

8. 3. Location of the Muscle Anterior vs. Posterior:
Tibialis ANTERIOR – located on FRONT of Tibia
Latissimus DORSI – located on BACK

9. 3. Location of the Muscle Medial vs. Lateral:
Vastus MEDIALIS: located on INNER side of thigh
Vastus LATERALIS: located on OUTER side of thigh

10. Facial, Trunk and Back Muscles
Facial & Trunk Muscles
Facial, Trunk and Back Muscles

11. Facial Expression Muscles
Epicranius – frontal belly
Orbicularis oculi
Orbicularis oris

12. Facial Expression Muscles
Epicranius - occipital belly
Zygomaticus
Risorius

13. Mastication & Neck Muscles
Temporalis
Masseter
Sternocleidomastoid

14. Torso Muscles – Study on the following 2 models
Shows SUPERFICIAL muscles only!!!
Shows SUPERFICIAL muscles on RIGHT and DEEP muscle on LEFT!!!

15. Deltoid Pectoralis major Serratus Anterior
TORSO MUSCLES – SUPERFICIAL ONLY!!!
Deltoid
Pectoralis major
Serratus Anterior

16. TORSO MUSCLES – SUPERFICIAL ONLY!!!
Rectus abdominis
External oblique

17. BACK MUSCLES – SUPERFICIAL ONLY!!!
Deltoid
Trapezius
Latissimus dorsi

18. Infraspinatus Teres Minor Teres Major
BACK MUSCLES – SUPERFICIAL ONLY!!!
Teres Minor
Teres Major

19. TORSO MUSCLES – SUPERFICIAL & DEEP!!!
External
intercostals (no #)

20. TORSO MUSCLES – SUPERFICIAL & DEEP!!!
Internal
intercostals (#26)

21. Pectoralis major (#28 and 29)
TORSO MUSCLES – SUPERFICIAL & DEEP!!!
Deltoid (#5)
Pectoralis major (#28 and 29)
Pectoralis minor (#27)
Serratus anterior (#24)

22. Rectus abdominis (#78 & 80) External oblique (#77)
TORSO MUSCLES – SUPERFICIAL & DEEP!!!
Rectus abdominis (#78 & 80)
External oblique (#77)
Internal oblique (#76)

23. Deltoid (#5) Trapezius (#23) Latissimus dorsi (#13)
BACK MUSCLES – SUPERFICIAL & DEEP!!!
Deltoid (#5)
Trapezius (#23)
Latissimus dorsi (#13)

24. Supraspinatus (#6) Infraspinatus (#10) Teres Minor (#11)
BACK MUSCLES – SUPERFICIAL & DEEP!!!
Supraspinatus (#6)
Infraspinatus (#10)
Teres Minor (#11)
Teres Major (#12)

25. BACK MUSCLES – SUPERFICIAL & DEEP!!!
Infraspinatus (#10)
Teres Minor (#11)
Teres Major (#12)

26. Rhomboid Minor (#20) Rhomboid Major (#18) BACK MUSCLES – SUPERFICIAL &
DEEP!!!
Rhomboid Minor (#20)
Rhomboid Major (#18)