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Skeletal Muscle Skeletal Muscle GroupsGroups
Ready or not, here we Ready or not, here we go!go!
A. Muscles of Facial A. Muscles of Facial ExpressionExpression
1. Frontalis1. Frontalis A: elevates eyebrowsA: elevates eyebrows O: occipital boneO: occipital bone I: skin of eyebrowI: skin of eyebrow
2. Occipitalis2. Occipitalis A: pulls scalp posteriorA: pulls scalp posterior O: mastoid process of occipital boneO: mastoid process of occipital bone I: galea aponeuroticaI: galea aponeurotica
3. Orbicularis oculi3. Orbicularis oculi A: closes eyelidA: closes eyelid O: frontal & maxillary bonesO: frontal & maxillary bones I: skin around eyelidI: skin around eyelid
4. Orbicularis oris4. Orbicularis oris A: closes lips A: closes lips
Kissing, speakingKissing, speaking O: facia surrounding lipsO: facia surrounding lips I: corners of mouthI: corners of mouth
5. Zygomaticus Major/Minor5. Zygomaticus Major/Minor A: Retracts & elevates corners of mouthA: Retracts & elevates corners of mouth
smilingsmiling O: zygomatic bone O: zygomatic bone I: corner of mouth/upper lipI: corner of mouth/upper lip
6. Buccinator- “kissing muscle”6. Buccinator- “kissing muscle” A: compresses cheeksA: compresses cheeks
Sucking, whistling, blowing Sucking, whistling, blowing O: mandible & maxillary bonesO: mandible & maxillary bones I: orbicularis orisI: orbicularis oris
7. Depressor anguli oris A: Depresses corner of mouth O: Anterolateral surface of mandibular
body I: Skin at corner of mouth
Muscles of Facial Muscles of Facial ExpressionExpression
B. Muscles of B. Muscles of MasticationMastication
1. Masseter- strongest jaw muscle1. Masseter- strongest jaw muscle A: elevates the mandibleA: elevates the mandible
Closes mouthCloses mouth O: zygomatic archO: zygomatic arch I: mandibular ramusI: mandibular ramus
2. Temporalis2. Temporalis A: elevates mandibleA: elevates mandible O: temporal bone O: temporal bone I: coronoid process of mandibleI: coronoid process of mandible
Muscles of MasticationMuscles of Mastication
C. Muscles of the NeckC. Muscles of the Neck1. Platysma1. Platysma
A. Depresses mandible, tenses neckA. Depresses mandible, tenses neck O: Upper thorax between cartilage of 2O: Upper thorax between cartilage of 2ndnd rib rib
& acromion process& acromion process I: Mandible & skin of cheekI: Mandible & skin of cheek
2. Sternocleidomastoid2. Sternocleidomastoid A: flexes head, turns head side to sideA: flexes head, turns head side to side O: clavicle & manubrium O: clavicle & manubrium I: mastoid process of temporal boneI: mastoid process of temporal bone
3. Omohyoid3. Omohyoid A. Depresses hyoid & larynxA. Depresses hyoid & larynx O: Central tendon attaches to clavicle & 1O: Central tendon attaches to clavicle & 1stst rib rib I: 2 bellies:I: 2 bellies:
Superior- hyoid boneSuperior- hyoid bone Inferior- superior margin of scapulaInferior- superior margin of scapula
4. Sternohyoid4. Sternohyoid A: Depresses hyoid & larynxA: Depresses hyoid & larynx O: Clavicle & manubriumO: Clavicle & manubrium I: Hyoid boneI: Hyoid bone
Muscles of the NeckMuscles of the Neck
Quiz Tomorrow!Quiz Tomorrow!
Head & Neck MusclesHead & Neck Muscles
D. Muscles of the Pectoral D. Muscles of the Pectoral GirdleGirdle
1. Trapezius1. Trapezius A: extends head & elevates scapulaA: extends head & elevates scapula
Look up & shrugs shouldersLook up & shrugs shoulders O: occipital bone & thoracic & cervical O: occipital bone & thoracic & cervical
vertebraevertebrae I: clavicle & scapulaI: clavicle & scapula
2. Serratus Anterior2. Serratus Anterior A: Abduction, upward rotation, protracts A: Abduction, upward rotation, protracts
shouldershoulder O: Anterior & superior margins of ribs 1-9O: Anterior & superior margins of ribs 1-9 I: Anterior surface of medial border of scapulaI: Anterior surface of medial border of scapula
3. Rhomboid Major/Minor3. Rhomboid Major/Minor A: Adduction, downward rotationA: Adduction, downward rotation O: O:
Major: Spinus processes of upper thoracic Major: Spinus processes of upper thoracic vertebravertebra
Minor: Spinus processes of cervical vertebraeMinor: Spinus processes of cervical vertebrae I: Vertebral border of scapulaI: Vertebral border of scapula
4. Pectoralis Minor4. Pectoralis Minor A: elevates ribs (breathing) & depresses A: elevates ribs (breathing) & depresses
shouldersshoulders O: ribs 3-5O: ribs 3-5 I: coracoid process of scapulaI: coracoid process of scapula
E. Muscles of the E. Muscles of the Shoulder & Upper ArmsShoulder & Upper Arms
1. Pectoralis Major1. Pectoralis Major A: adducts & flexes humerus, rotates A: adducts & flexes humerus, rotates
arms mediallyarms medially O: clavicle, sternum, & costal cartilageO: clavicle, sternum, & costal cartilage I: greater tubercle of humerusI: greater tubercle of humerus
2. Deltoid2. Deltoid A: abducts humerusA: abducts humerus O: clavicle & scapulaO: clavicle & scapula I: deltoid tuberosity of humerusI: deltoid tuberosity of humerus
(Rotator Cuff Muscles)(Rotator Cuff Muscles)
3. Supraspinatus3. Supraspinatus A: Abduction, stabilizationA: Abduction, stabilization O: Supraspinous fossa of scapulaO: Supraspinous fossa of scapula I: Greater tubercle of humerusI: Greater tubercle of humerus
4. Infraspinatus 4. Infraspinatus A: Adduction, outward rotationA: Adduction, outward rotation O: Infraspinous fossa of scapulaO: Infraspinous fossa of scapula I: Greater tubercle of humerusI: Greater tubercle of humerus
(Rotator Cuff Muscles)(Rotator Cuff Muscles)
5. Teres Minor5. Teres Minor A: Adduction, outward rotationA: Adduction, outward rotation O: Inferior angle of scapulaO: Inferior angle of scapula I: Medial lip of intertubercular groove of I: Medial lip of intertubercular groove of
humerushumerus
6. Subscapularis 6. Subscapularis A: Adduction, inward rotationA: Adduction, inward rotation O: Subscapular fossa of scapulaO: Subscapular fossa of scapula I: Lesser tubercle of humerusI: Lesser tubercle of humerus
7. Teres Major7. Teres Major A: Adduct, inward rotation, extensionA: Adduct, inward rotation, extension O: Inferior angle of scapulaO: Inferior angle of scapula I: Medial lip of intertubercular groove of I: Medial lip of intertubercular groove of
humerushumerus
8. Latissimus Dorsi8. Latissimus Dorsi A: extends, adducts, & rotates arms A: extends, adducts, & rotates arms
mediallymedially O: spines of T7-sacrum, iliac crest, & ribs O: spines of T7-sacrum, iliac crest, & ribs
9-129-12 I: intertubercular groove of humerusI: intertubercular groove of humerus
9. Biceps Brachii- “two heads”9. Biceps Brachii- “two heads” A: flexes arm @ elbow, supinates forearmA: flexes arm @ elbow, supinates forearm O: scapulaO: scapula I: radial tuberosityI: radial tuberosity
10. Triceps Brachii- “three heads”10. Triceps Brachii- “three heads” A: extends arm (antagonist to biceps A: extends arm (antagonist to biceps
brachii)brachii) O: scapula & humerusO: scapula & humerus I: olecranon process of ulnaI: olecranon process of ulna
11. Coracobrachialis11. Coracobrachialis A: Adduction, flexionA: Adduction, flexion O: Coracoid processO: Coracoid process I: Medial margin of shaft of humerusI: Medial margin of shaft of humerus
F. Muscles of the F. Muscles of the ForearmForearm
1. Brachioradialis1. Brachioradialis A: flexes arm @ elbow, supinates forearmA: flexes arm @ elbow, supinates forearm O: lateral epicondyle of humerusO: lateral epicondyle of humerus I: styloid process of radiusI: styloid process of radius
2. Brachialis2. Brachialis A: FlexionA: Flexion O: Anterior distal surface of the humerusO: Anterior distal surface of the humerus I: Tuberosity of ulnaI: Tuberosity of ulna
(mentioned previously)(mentioned previously)
3. Biceps Brachii3. Biceps Brachii A: Flexion, supinationA: Flexion, supination O: scapulaO: scapula I: radial tuberosityI: radial tuberosity
4. Triceps Brachii4. Triceps Brachii A: extends armA: extends arm O: scapula & humerusO: scapula & humerus I: olecranon process of ulnaI: olecranon process of ulna
G. Muscles of the Hand & G. Muscles of the Hand & WristWrist
1. Flexor Carpi Radialis1. Flexor Carpi Radialis A: Flexion & abducts wrist & handA: Flexion & abducts wrist & hand O: Medial epicondyle of humerusO: Medial epicondyle of humerus I: Base of 2I: Base of 2ndnd & 3 & 3rdrd metacarpals metacarpals
2. Palmaris Longus2. Palmaris Longus A: Flexion of the wrist and handA: Flexion of the wrist and hand O: Medial epicondyle of humerusO: Medial epicondyle of humerus I: Palmar aponerosis & flexor I: Palmar aponerosis & flexor
retinaculumretinaculum
3. Flexor Carpi Ulnaris3. Flexor Carpi Ulnaris A: Flexion & adduction of wrist & handA: Flexion & adduction of wrist & hand O: Medial epicondlye of humerus, medial O: Medial epicondlye of humerus, medial
surface of olecranon, anteromedial part of surface of olecranon, anteromedial part of ulnaulna
I: Pisiform & hamate bones & 5I: Pisiform & hamate bones & 5thth metacarpal metacarpal
4. Extensor Carpi Radialis Longus4. Extensor Carpi Radialis Longus A: Extension & abduction of wrist & handA: Extension & abduction of wrist & hand O: Lateral supracondylar ridge of humerusO: Lateral supracondylar ridge of humerus I: 2I: 2ndnd metacarpal metacarpal
5. Extensor Digitorum5. Extensor Digitorum A: Extension of the fingers & handA: Extension of the fingers & hand O: Lateral epicondyle of humerusO: Lateral epicondyle of humerus I: Posterior surfaces of phalanges 2-5I: Posterior surfaces of phalanges 2-5
6. Extensor Carpi Ulnaris6. Extensor Carpi Ulnaris A: Extension & adduction of wrist & handA: Extension & adduction of wrist & hand O: Lateral epicondyle of humerus, dorsal O: Lateral epicondyle of humerus, dorsal
surface of ulnasurface of ulna I: Base of 5I: Base of 5thth metacarpal metacarpal
Flexors
ExtensorsExtensors
Quiz TomorrowQuiz Tomorrow
Shoulder, Arm, Forearm, Shoulder, Arm, Forearm, Wrist & Hand MusclesWrist & Hand Muscles