Anatomy - Lab I - Extrinsic Muscles Of Scapula And Brachius

Front 1

Superficial pectoral origin

Back 1

Cranial sternum

Front 2

Superficial pectoral insertion

Back 2

Crest of the Greater tubercle

Cranial border of humerus

Front 3

Superficial pectoral action

Back 3

Adduct limb when not bearing weight

Prevent limb from being abducted when bearing weight

Front 4

Superficial pectoral innervation

Back 4

Cranial pectoral muscles (C7, C8)

Front 5

Deep pectoral origin

Back 5

sternum

Front 6

Deep pectoral insertion

Back 6

Greater and lesser tubercles

Front 7

Deep pectoral action

Back 7

When limb is advanced and fixed, pulls trunk cranially

When limb is not supporting weight, adducts the limb

Front 8

Deep pectoral innervation

Back 8

Caudal pectoral nerves (C8, T1)

Front 9

Brachiocephalicus origin

Back 9

Clavicular intersection

Front 10

Brachiocephalicus insertion

Back 10

Cleidobrachialis:
Dog: Distal cranial humerus
Cat: Proximal ulna


Cleidocephalicus
Mastoid: Mastoid process of temporal bone
Cervical: Dorsal neck (Car)

Front 11

Brachiocephalicus action

Back 11

Pull thoracic limb cranially

Draw head from side to side and/or depress head

Front 12

Brachiocephalicus innervation

Back 12

Accessory nerve and ventral branches of cervical spinal nerves

Front 13

Sternocephalicus attachments

Back 13

Cranial attachment:
Mastoid part: Mastoid process of temporal bone
Occipital part: Occipital bone

Caudal attachment:
Cranial sternum

Front 15

Sternocephalicus action

Back 15

Draw head and neck to side

Depress head and neck

Front 16

Sternocephalicus innervation

Back 16

Accessory nerve and ventral branches of cervical spinal nerves

Front 17

Sternohyoideus origin

Back 17

Cranial sternum

Front 18

Sternohyoideus insertion

Back 18

Basihyoid bone (located in the base of the tongue)

Front 19

Sternohyoideus action

Back 19

Pull tongue and larynx caudally

Front 20

Sternohyoideus innervation

Back 20

Ventral branches of cervical spinal nerves

Front 21

Sternothyroideus origin

Back 21

Cranial sternum

Front 22

Sternothyroideus insertion

Back 22

thyroid cartilage of the larynx

Front 23

Sternothyroideus action

Back 23

Draws larynx and tongue caudally

Front 24

Sternothyroideus innervation

Back 24

Ventral branches of cervical spinal nerves

Front 25

Omotransversarius origin

Back 25

Wing of the atlas

Front 26

Omotransversarius insertion

Back 26

Distal spine of the scapula

Front 27

Omotransversarius action

Back 27

Pull thoracic limb cranially when not bearing weight

Depress and pull head and neck to the side

Front 28

Omotransversarius innervation

Back 28

Accessory nerve

Front 29

Trapezius origin

Back 29

Cervical part: Dorsal neck
Thoracic part: Dorsal thorax

Front 30

Trapezius insertion

Back 30

Spine of scapula

Front 31

Trapezius action

Back 31

Elevate thoracic limb

Front 32

Trapezius innervation

Back 32

Accessory nerve

Front 33

Rhomboideus origin

Back 33

Capital part (Car): occipital bone

Cervical part: dorsal neck
Thoracic part: dorsal thorax

Front 34

Rhomboideus insertion

Back 34

Dorsal border of scapula

Front 35

Rhomboideus action

Back 35

Elevate thoracic limb

Depress scapula to the trunk

Front 36

Rhomboideus innervation

Back 36

Ventral branches of cervical and thoracic spinal nerves

Front 37

Serratus ventralis origin

Back 37

Cervical part: cervical vertebrae

Thoracic part: thoracic wall (ribs)

Front 38

Serratus ventralis insertion

Back 38

Serrated face of scapula

Front 39

Serratus ventralis action

Back 39

Support/elevate the trunk

Front 40

Serratus ventralis innervation

Back 40

Ventral branches of cervical spinal nerves and the long thoracic nerve (C7)

Front 41

Latissimus dorsi origin

Back 41

Thoracolumbar fascia

Front 42

Latissimus dorsi insertion

Back 42

Teres major tuberosity

Front 43

Latissimus dorsi action

Back 43

Draw thoracic limb caudally

Non-weight bearing: flex humeral joint

Weight bearing: extend humeral joint

Front 44

Latissimus dorsi innervation

Back 44

Thoracodorsal nerve (C7, C8, T1)

Front 45

Coracobrachialis origin

Back 45

Coracoid process of scapula

Front 46

Coracobrachialis insertion

Back 46

Crest of lesser tubercle

Front 47

Coracobrachialis action

Back 47

Adduct limb at humeral joint

Serve as a medial collateral ligament of the humeral joint

Front 48

Coracobrachialis innervation

Back 48

Musculocutaneous nerve

Front 49

Biceps brachii origin

Back 49

Supraglenoid tubercle of the scapula

Front 50

Biceps brachii insertion

Back 50

Porximal and medial aspects of radius and ulna

Front 51

Biceps brachii action

Back 51

Flex cubital joint

Extend humeral joint

Front 52

Biceps brachii innervation

Back 52

Musculocutaneous nerve

Front 53

Brachialis origin

Back 53

Proximal part of lateral humerus

Front 54

Brachialis insertion

Back 54

Proximal and medial aspects of radius and ulna

Front 55

Brachialis action

Back 55

Flex cubital joint

Front 56

Brachialis innervation

Back 56

Musculocutaneous nerve

Front 57

Triceps brachii origin

Back 57

Long head: Caudal border of scapula

Other heads: proximal humerus

Front 58

Triceps brachii insertion

Back 58

Tuber olecrani

Front 59

Triceps brachii action

Back 59

All heads: Extend cubital joint

Long head: Flex humeral joint

Front 60

Triceps brachii innervation

Back 60

Radial nerve

Front 61

Tensor fasciae antebrachii origin

Back 61

Latissimus dorsi and fascia on caudal border of scapula

Front 62

Tensor fasciae antebrachii insertion

Back 62

Tuber olecrani

Front 63

Tensor fasciae antebrachii action

Back 63

Extend cubital joint

Front 64

Tensor fasciae antebrachii innervation

Back 64

Radial nerve

Front 65

Anconeus origin

Back 65

Caudal aspect of distal humerus

Front 66

Anconeus insertion

Back 66

Tuber olecrani

Front 67

Anconeus action

Back 67

Extend cubital joint

Front 68

Anconeus innervation

Back 68

Radial nerve