1. Head and Neck Muscles
Figure 6.15

2. Head and Neck Muscles Facial muscles Frontalis—raises eyebrows
Orbicularis oculi—closes eyes, squints, blinks, winks
Orbicularis oris—closes mouth and protrudes the lips
Buccinator—flattens the cheek, chews
Zygomaticus—raises corners of the mouth
Chewing muscles
Masseter—closes the jaw and elevates mandible
Temporalis—synergist of the masseter, closes jaw

3. Head and Neck Muscles Neck muscles
Platysma—pulls the corners of the mouth inferiorly
Sternocleidomastoid—flexes the neck, rotates the head

4. Head and Neck Muscles
Figure 6.15

5. Anterior Muscles of Trunk, Shoulder, Arm
Figure 6.16a

6. Muscles of Trunk, Shoulder, Arm
Anterior muscles
Pectoralis major—adducts and flexes the humerus
Intercostal muscles
External intercostals—raise rib cage during inhalation
Internal intercostals—depress the rib cage to move air out of the lungs when you exhale forcibly

7. Anterior Muscles of Trunk, Shoulder, Arm
Figure 6.16a

8. Anterior Muscles of Trunk, Shoulder, Arm
Figure 6.16b

9. Muscles of Trunk, Shoulder, Arm
Muscles of the abdominal girdle
Rectus abdominis—flexes vertebral column and compresses abdominal contents (defecation, childbirth, forced breathing)
External and internal obliques—flex vertebral column; rotate trunk and bend it laterally
Transversus abdominis—compresses abdominal contents

10. Anterior Muscles of Trunk, Shoulder, Arm
Figure 6.16b

11. Muscles of Trunk, Shoulder, Arm
Posterior muscles
Trapezius—elevates, depresses, adducts, and stabilizes the scapula
Latissimus dorsi—extends and adducts the humerus
Erector spinae—back extension
Quadratus lumborum—flexes the spine laterally
Deltoid—arm abduction

12. Muscles of Posterior Neck, Trunk, Arm
Figure 6.17a

13. Muscles of Posterior Neck, Trunk, Arm
Figure 6.17b

14. Muscles of the Upper Limb
Biceps brachii—supinates forearm, flexes elbow
Brachialis—elbow flexion
Brachioradialis—weak muscle
Triceps brachii—elbow extension (antagonist to biceps brachii)

15. Anterior Muscles of Trunk, Shoulder, Arm
Figure 6.16a

16. Muscles of Posterior Neck, Trunk, Arm
Figure 6.17a

17. Muscles of the Lower Limb
Gluteus maximus—hip extension
Gluteus medius—hip abduction, steadies pelvis when walking
Iliopsoas—hip flexion, keeps the upper body from falling backward when standing erect
Adductor muscles—adduct the thighs

18. Muscles of the Pelvis, Hip, Thigh
Figure 6.19a

19. Muscles of the Pelvis, Hip, Thigh
Figure 6.19c

20. Muscles of the Lower Limb
Muscles causing movement at the knee joint
Hamstring group—thigh extension and knee flexion
Biceps femoris
Semimembranosus
Semitendinosus

21. Muscles of the Pelvis, Hip, Thigh
Figure 6.19a

22. Muscles of the Lower Limb
Muscles causing movement at the knee joint
Sartorius—flexes the thigh
Quadriceps group—extends the knee
Rectus femoris
Vastus muscles (three)

23. Muscles of the Pelvis, Hip, Thigh
Figure 6.19c

24. Muscles of the Lower Limb
Muscles causing movement at ankle and foot
Tibialis anterior—dorsiflexion and foot inversion
Extensor digitorum longus—toe extension and dorsiflexion of the foot
Fibularis muscles—plantar flexion, everts the foot
Soleus—plantar flexion

25. Muscles of the Lower Leg
Figure 6.20a

26. Muscles of the Lower Leg
Figure 6.20b

27. Superficial Muscles: Anterior
Figure 6.21

28. Superficial Muscles: Posterior
Figure 6.22

29. Superficial Anterior Muscles of the Body
Table 6.3 (1 of 3)

30. Superficial Anterior Muscles of the Body
Table 6.3 (2 of 3)

31. Superficial Anterior Muscles of the Body
Table 6.3 (3 of 3)

32. Superficial Posterior Muscles of the Body
Table 6.4 (1 of 3)

33. Superficial Posterior Muscles of the Body
Table 6.4 (2 of 3)

34. Superficial Posterior Muscles of the Body
Table 6.4 (3 of 3)

35. Intramuscular Injection Sites
Figure 6.18, 6.19b, d