1. Skeletal Muscle Groups
Ready or not, here we go!

2. A. Muscles of Facial Expression
1. Frontalis
A: elevates eyebrows
O: occipital bone
I: skin of eyebrow
2. Occipitalis
A: pulls scalp posterior
O: mastoid process of occipital bone
I: galea aponeurotica

3. 3. Orbicularis oculi 4. Orbicularis oris A: closes eyelid
O: frontal & maxillary bones
I: skin around eyelid
4. Orbicularis oris
A: closes lips
Kissing, speaking
O: facia surrounding lips
I: corners of mouth

4. 5. Zygomaticus Major/Minor
A: Retracts & elevates corners of mouth
smiling
O: zygomatic bone
I: corner of mouth/upper lip
6. Buccinator- “kissing muscle”
A: compresses cheeks
Sucking, whistling, blowing
O: mandible & maxillary bones
I: orbicularis oris

5. 7. Depressor anguli oris A: Depresses corner of mouth
O: Anterolateral surface of mandibular body
I: Skin at corner of mouth

6. Muscles of Facial Expression

7. B. Muscles of Mastication
1. Masseter- strongest jaw muscle
A: elevates the mandible
Closes mouth
O: zygomatic arch
I: mandibular ramus
2. Temporalis
A: elevates mandible
O: temporal bone
I: coronoid process of mandible

8. Muscles of Mastication

9. C. Muscles of the Neck 1. Platysma 2. Sternocleidomastoid
A. Depresses mandible, tenses neck
O: Upper thorax between cartilage of 2nd rib & acromion process
I: Mandible & skin of cheek
2. Sternocleidomastoid
A: flexes head, turns head side to side
O: clavicle & manubrium
I: mastoid process of temporal bone

10. 3. Omohyoid 4. Sternohyoid A. Depresses hyoid & larynx
O: Central tendon attaches to clavicle & 1st rib
I: 2 bellies:
Superior- hyoid bone
Inferior- superior margin of scapula
4. Sternohyoid
A: Depresses hyoid & larynx
O: Clavicle & manubrium
I: Hyoid bone

11. Muscles of the Neck

13. Quiz Tomorrow!
Head & Neck Muscles

14. D. Muscles of the Pectoral Girdle
1. Trapezius
A: extends head & elevates scapula
Look up & shrugs shoulders
O: occipital bone & thoracic & cervical vertebrae
I: clavicle & scapula
2. Serratus Anterior
A: Abduction, upward rotation, protracts shoulder
O: Anterior & superior margins of ribs 1-9
I: Anterior surface of medial border of scapula

15. 3. Rhomboid Major/Minor 4. Pectoralis Minor
A: Adduction, downward rotation O:
Major: Spinus processes of upper thoracic vertebra
Minor: Spinus processes of cervical vertebrae
I: Vertebral border of scapula
4. Pectoralis Minor
A: elevates ribs (breathing) & depresses shoulders
O: ribs 3-5
I: coracoid process of scapula

17. E. Muscles of the Shoulder & Upper Arms
1. Pectoralis Major
A: adducts & flexes humerus, rotates arms medially
O: clavicle, sternum, & costal cartilage
I: greater tubercle of humerus
2. Deltoid
A: abducts humerus
O: clavicle & scapula
I: deltoid tuberosity of humerus

18. (Rotator Cuff Muscles)
3. Supraspinatus
A: Abduction, stabilization
O: Supraspinous fossa of scapula
I: Greater tubercle of humerus
4. Infraspinatus
A: Adduction, outward rotation
O: Infraspinous fossa of scapula

19. (Rotator Cuff Muscles)
5. Teres Minor
A: Adduction, outward rotation
O: Inferior angle of scapula
I: Medial lip of intertubercular groove of humerus
6. Subscapularis
A: Adduction, inward rotation
O: Subscapular fossa of scapula
I: Lesser tubercle of humerus

21. 7. Teres Major 8. Latissimus Dorsi
A: Adduct, inward rotation, extension
O: Inferior angle of scapula
I: Medial lip of intertubercular groove of humerus
8. Latissimus Dorsi
A: extends, adducts, & rotates arms medially
O: spines of T7-sacrum, iliac crest, & ribs 9-12
I: intertubercular groove of humerus

22. 9. Biceps Brachii- “two heads”
A: flexes elbow, supinates forearm
O: scapula
I: radial tuberosity
10. Triceps Brachii- “three heads”
A: extends arm (antagonist to biceps brachii)
O: scapula & humerus
I: olecranon process of ulna

23. 11. Coracobrachialis A: Adduction, flexion O: Coracoid process
I: Medial margin of shaft of humerus

26. F. Muscles of the Forearm
1. Brachioradialis
A: flexes elbow, supinates forearm
O: lateral epicondyle of humerus
I: styloid process of radius
2. Brachialis
A: Flexion
O: Anterior distal surface of the humerus
I: Tuberosity of ulna

27. (mentioned previously)
3. Biceps Brachii
A: Flexion, supination
O: scapula
I: radial tuberosity
4. Triceps Brachii
A: extends arm
O: scapula & humerus
I: olecranon process of ulna

29. G. Muscles of the Hand & Wrist
1. Flexor Carpi Radialis
A: Flexion & abducts wrist & hand
O: Medial epicondyle of humerus
I: Base of 2nd & 3rd metacarpals
2. Palmaris Longus
A: Flexion of the wrist and hand
I: Palmar aponerosis & flexor retinaculum

30. 4. Extensor Carpi Radialis Longus
3. Flexor Carpi Ulnaris
A: Flexion & adduction of wrist & hand
O: Medial epicondlye of humerus, medial surface of olecranon, anteromedial part of ulna
I: Pisiform & hamate bones & 5th metacarpal
4. Extensor Carpi Radialis Longus
A: Extension & abduction of wrist & hand
O: Lateral supracondylar ridge of humerus
I: 2nd metacarpal

31. 6. Extensor Carpi Ulnaris
5. Extensor Digitorum
A: Extension of the fingers & hand
O: Lateral epicondyle of humerus
I: Posterior surfaces of phalanges 2-5
6. Extensor Carpi Ulnaris
A: Extension & adduction of wrist & hand
O: Lateral epicondyle of humerus, dorsal surface of ulna
I: Base of 5th metacarpal

32. Flexors

33. Extensors

34. Shoulder, Arm, Forearm, Wrist & Hand Muscles
Quiz Tomorrow
Shoulder, Arm, Forearm, Wrist & Hand Muscles