Muscles Acting On The Axial Skeleton - Origin, Insertion, And Innervation

Front 1

Origin of Trapezius

Back 1

External occipital crest |

ligamentum nuchae |

spinous processes of all thoracic vertebrae

Front 2

Insertion of Trapezius

Back 2

Lateral, posterior clavicle |

Acromion Process of Scapula |

Scapular spine

Front 3

Innervation of Trapezius

Back 3

Accessory Nerve

Front 4

Actions of upper fibres of Trapezius

Back 4

Scapular elevation |

Unilateral side flexion |

Bilateral neck extension

Front 5

Actions of middle fibres of Trapezius

Back 5

Scapular retraction

Front 6

Actions of lower fibres of Trapezius

Back 6

Pull medial end of scapular spine inferiorly

(rotate glenoid fossa superiorly) |

Depress Scapula

Front 7

Origin of the Levator Scapulae

Back 7

Transverse processes of the cervical vertebrae (C1 - C4)

Front 8

Insertion of Levator scapulae

Back 8

Superior Angle of Scapula

Front 9

Action of Levator Scapulae

Back 9

Scapular Elevation

Front 10

Innervation of Levator Scapulae

Back 10

Dorsal Scapular Nerve

Front 11

Origin of Rhomboid Major

Back 11

Spinous Processes of Thoracic Vertebrae

(T2 - T5)

Front 12

Insertion of Rhomboid Major

Back 12

Medial (vertebral) border of scapula

Front 13

Innervation of Rhomboid Major

Back 13

Dorsal Scapular Nerve

Front 14

Action of Rhomboid Major

Back 14

Retraction of Scapula

Front 15

Origin of Rhomboid Minor

Back 15

Spinous Processes C7 and T1

Front 16

Insertion of Rhomboid Minor

Back 16

Superior Medial (Vertebral) Border of Scapula

Front 17

Innervation of Rhomboid Minor

Back 17

Dorsal Scapular Nerve

Front 18

Action of Rhomboid Minor

Back 18

Retraction of Scapula

Front 19

Origin of Serratus Anterior

Back 19

Anterior surfaces of first 8 ribs

Front 20

Insertion of Serratus Anterior

Back 20

Medial (vertebral) border of scapula

Front 21

Action of Serratus Anterior

Back 21

Protraction of Scapula

Front 22

Innervation of Serratus Anterior

Back 22

Long Thoracic Nerve

Front 23

Origin of Pectoralis Minor

Back 23

Ribs 3, 4, and 5

(Lateral to costal cartilages)

Front 24

Insertion of Pectoralis Minor

Back 24

Coracoid Process of the Scapula

Front 25

Action of Pectoralis Minor

Back 25

Protraction of Scapula

Front 26

Innervation of Pectoralis Minor

Back 26

Medial Pectoral Nerve

Front 27

Origin of Subclavius

Back 27

First Rib

Front 28

Insertion of Subclavius

Back 28

Inferior surface of Clavicle

Front 29

Innervation of Subclavius

Back 29

Nerve to Subclavius

Front 30

Action of Subclavius

Back 30

Clavicular Depression |

Elevation of First Rib

Front 31

Origin of Clavicular Head ofPectoralis Major

Back 31

Anterior Clavicle

Front 32

Origin of Sternal Head ofPectoralis Major

Back 32

Sternum and Costal Cartilages of Ribs 1-6

Front 33

Innervation ofPectoralis Major

Back 33

Pectoral Nerves

Front 34

Insertion ofPectoralis Major

Back 34

Lateral lip of bicipital (intertubercular) groove

Front 35

Action of Clavicular head of Pectoralis Major

Back 35

Flexion of the Humerus

Front 36

Action of Sternal head ofPectoralis Major

Back 36

Extension of the Humerus

Front 37

Action of Pectoralis Major

(both heads)

Back 37

Medial rotation of Humerus |

Adduction of Humerus

Front 38

Origin of Latissimus Dorsi

Back 38

Lower 6 thoracic vertebrae |

All lumbar and sacral vertebrae |

Posterior Iliac Crest |

Lower 3 or 4 Ribs

Front 39

Insertion ofLatissimus Dorsi

Back 39

Floor of biceptial groove

Front 40

Innervation ofLatissimus Dorsi

Back 40

Thoracodorsal Nerve

Front 41

Action ofLatissimus Dorsi

Back 41

Glenohumeral Extension |

Medial Rotation of arm

Front 42

Origin ofTeres Major

Back 42

Inferior Angle of Scapula

Front 43

Insertion ofTeres Major

Back 43

Bicipital Groove

Front 44

Action ofTeres Major

Back 44

Glenohumeral Extension |

Medial Rotation of arm

Front 45

Innervation ofTeres Major

Back 45

Lower Subscapular Nerve

Front 46

Action of the Anterior Rotator Cuff Muscle

Back 46

Medial rotation of Glenohumeral Joint

Front 47

Action of the Posterior Rotator Cuff Muscles

Back 47

Lateral rotation of Glenohumeral Joint

Front 48

The Only Anterior Rotator Cuff Muscle

Back 48

Subscapularis

Front 49

The Most Superior Posterior Rotator Cuff Muscle

Back 49

Supraspinatus

Front 50

The Largest Posterior Rotator Cuff Muscle

Back 50

Infraspinatus

Front 51

The Most Inferior Posterior Rotator Cuff Muscle

Back 51

Teres Minor

Front 52

Origin of Subscapularus

Back 52

Subscapular Fossa

Front 53

Insertion ofSubscapularus

Back 53

Lesser Tuberosity of the Humerus

Front 54

Innervation ofSubscapularus

Back 54

Subscapular Nerves

Front 55

Action ofSubscapularus

Back 55

Medial Rotation of Humerus

Front 56

Origin ofSupraspinatus

Back 56

Supraspinous Fossa of Scapula

Front 57

Innervation of Supraspinatus

Back 57

Suprascapular Nerve

Front 58

Insertion ofSupraspinatus

Back 58

Greater Tuberosity of Humerus

Front 59

Action of Supraspinatus

Back 59

Initiates first 15 degrees of glenohumeral abduction

Front 60

Origin of Infraspinatus

Back 60

Infraspinous Fossa of Scapula

Front 61

Insertion ofInfraspinatus

Back 61

Greater Tuberosity of Humerus

Front 62

Innervation ofInfraspinatus

Back 62

Suprascapular Nerve

Front 63

Action ofInfraspinatus

Back 63

Glenohumeral Adduction |

Lateral Rotation of Glenohumeral Joint

Front 64

Origin of Teres Minor

Back 64

Inferior angle of scapula

Front 65

Insertion ofTeres Minor

Back 65

Greater Tuberosity of the Humerus

Front 66

Action ofTeres Minor

Back 66

Lateral rotation of the glenohumeral joint |

Glenohumeral adduction |

Glenohumeral extension

Front 67

Innervation ofTeres Minor

Back 67

Axillary Nerve

Front 68

Origin ofDeltoid

Back 68

Lateral Clavicle |

Lateral Acromion process of scapula |

Posterior Scapular Spine

Front 69

Insertion ofDeltoid

Back 69

Deltoid Tuberosity of Humerus

Front 70

Innervation of Deltoid

Back 70

Axillary Nerve

Front 71

Action ofDeltoid

Back 71

Glenohumeral Abduction (doesn't initiate) |

Anterior Head: Glenohumeral Flexion |

Posterior Head: Glenohumeral Extension

Front 72

Origin of Coracobrachialis

Back 72

Coracoid Process of Scapula

Front 73

Insertion ofCoracobrachialis

Back 73

Medial Shaft of Humerus

Front 74

Action ofCoracobrachialis

Back 74

Glenohumeral Flexion |

Glenohumeral Adduction against resistance

(lifting a tankard, for example)

Front 75

Innervation ofCoracobrachialis

Back 75

Musculocutaneus Nerve