1. Muscles of the Head and Neck
The Muscular System

2. General Muscle Terminology
Origin: stationary point of attachment
Insertion: movable point of attachment
Action: Anatomical movement that results from the contraction of the muscle

3. General Info: Facial muscles
Most muscles originate on the surface of the skull and insert into the dermis
Create facial movements and expressions

4. Frontalis
Action: raises eyebrow, wrinkles forehead

5. Occipitalis
Action: tenses and retracts the scalp

6. Masseter
Action: closes mandible
Ex: closes mouth during chewing

7. Temporalis Action: elevates mandible
Ex: clenching your jaw, crushing food

8. Orbicularis oculi
Action: closes eye
Ex: blinking, squinting

9. Nasalis
Action: compresses nostril

10. Zygomaticus
Action: draws corner of mouth upward
Ex: smiling

11. Buccinator
Action: compresses cheeks
Ex: playing a trumpet, whistling

12. Orbicularis oris
Action: compresses, purses lips
Ex: kissing

13. Depressor anguli oris
Action: depresses corner of mouth
Ex: frowning

14. Anatomy - Human frontalis temporalis Orbicularis oculi zygomaticus
masseter
Orbicularis oris
buccinator
Depressor anguli
platysma
sternocleidomastoid

15. Epicranial aponeurosis
frontalis
occipitalis
temporalis
Orbicularis oculi
nasalis
zygomaticus
masseter
buccinator
sternoclediomastoid
Orbicularis oris
platysma

16. General Info: Neck muscles
Involved in
Swallowing and chewing
Moving your head and neck
Supporting your head
Anterior neck muscles work on the hyoid bone
Suprahyoid muscles (above the hyoid) pull hyoid up
Infrahyoid muscles (below the hyoid) pull hyoid down

17. Sternocleidomastoid
Extends from the clavicles and the sternum to the mastoid region of the skull
Actions: flexion of head, lateral flexion, rotation of head side to side

18. Platysma
Action: tenses skin of neck, depresses mandible (opens mouth)

19. Digastric (“two bellies”)
Action: elevates hyoid bone when swallowing; depresses the mandible (opening mouth)

20. Mylohyoid
Broad/flat muscle provides muscular floor to the mouth and helps press tongue to top of mouth

21. Sternohyoid Connects the hyoid bone to the sternum
Action: depresses hyoid bone and larynx

22. Sternothyroid Anchors the larynx to the sternum
Action: depresses hyoid bone and larynx

23. Stylohyoid Connects the hyoid bone to the styloid process of the skull
Action: elevates hyoid

24. digastric
mylohyoid
stylohyoid
thyrohyoid
omohyoid
sternohyoid
sternothyroid

25. Superficial muscles of the neck
Sternomastoid
Cleidomastoid
Sternohyoid
Mylohyoid
Digastric
Masseter
Sternomastoid = #18
Cleidomastoid = #6
Sternohyoid = #17
Mylohyoid = #11
Digastric = #7
Masseter = #10
TOO DEEP TO DISSECT
Stylohyoid Sternothyroid Thyrohyoid

26. Digastric
Mylohyoid
Masseter
Sternohyoid
sternomastoid
cleidomastoid

28. Name the muscle…
Frontalis

29. Buccinator and orbicularis oris
Name the muscle…
Buccinator and orbicularis oris

30. Name the muscle…
Orbicularis oculi

31. Name the muscle…
Platysma

32. Name the muscle…
Orbicularis oris

33. Name the muscle…
Depressor Anguli Oris