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

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

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

4. 5. Zygomaticus Major/Minor A: Retracts & elevates corners of mouth A: Retracts & elevates corners of mouth smiling smiling O: zygomatic bone O: zygomatic bone I: corner of mouth/upper lip I: corner of mouth/upper lip 6. Buccinator- “kissing muscle” A: compresses cheeks A: compresses cheeks Sucking, whistling, blowing Sucking, whistling, blowing O: mandible & maxillary bones O: mandible & maxillary bones I: orbicularis oris 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 A: elevates the mandible Closes mouth Closes mouth O: zygomatic arch O: zygomatic arch I: mandibular ramus I: mandibular ramus 2. Temporalis A: elevates mandible A: elevates mandible O: temporal bone O: temporal bone I: coronoid process of mandible I: coronoid process of mandible

8. Muscles of Mastication

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

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

11. Muscles of the Neck

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

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

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

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

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

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

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

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