Extrinsic Thoracic Muscles (Muscles & Info)

Front 1

Back 1

Descending Superficial Pectoral Muscle

Front 2

Back 2

Transverse Superficial Pectoral Muscle

Front 3

Back 3

Deep Pectoral Muscle (Ascending)

Front 4

Back 4

Descending Superficial Pectoral Muscle

Front 5

Back 5

Transverse Superficial Pectoral Muscle

Front 6

Back 6

Deep Pectoral Muscle (Ascending)

Front 7

Back 7

Superficial Pectoral Muscle

Front 8

Back 8

Deep Pectoral Muscle

Front 9

Back 9

Superficial Pectoral Muscle

Front 10

Back 10

Deep Pectoral Muscle

Front 11

Back 11

Pectoantebrachialis Muscle

Front 12

Back 12

Xiphihumeralis (cats only)

Front 13

Back 13

Cleidocephalicus Muscle

Front 14

Back 14

Cleidobrachialis Muscle

Front 15

Back 15

Clavicular Intersection

Front 16

Back 16

Cleidocervicalis Muscle

Front 17

Back 17

Cleidomastodius Muscle

Front 18

Back 18

Cleidocephalicus Muscle

Front 19

Back 19

Clavicular Intersection

Front 20

Back 20

Cleidobrachialis Muscle

Front 21

Back 21

Cleidocervicalis

Front 22

Back 22

Clavicular Intersection

Front 23

Back 23

Cleidobrachialis Muscle

Front 24

Back 24

Sterno-occipitalis Muscle

Front 25

Back 25

Sternocephalicus Muscle

Front 26

Back 26

Sternocephalicus

Front 27

Back 27

Sternohyoideus Muscle

Front 28

Back 28

Sternohyoideus (sternocephalicus reflected)

Front 29

Back 29

Sternocephalicus Muscle

Front 30

Back 30

Sternohyoideus Muscle

Front 31

Back 31

Sternothyroid Muscle

Front 32

Back 32

Osmotransversarius Muscle

Front 33

Back 33

Osmotransversarius Muscle

Front 34

Back 34

Osmotransversarius Muscle

Front 35

Back 35

Osmotransversarius Muscle

Front 36

Back 36

Osmotransversarius Muscle

Front 37

Back 37

Trapezius Muscle

Front 38

Back 38

Trapezius Muscle

Front 39

Back 39

Trapezius Muscle

Front 40

Back 40

Trapezius Muscle

Front 41

Back 41

Trapezius Muscle

Front 42

Back 42

Rhomboideus Thoracis

Front 43

Back 43

Rhomboideus Cervicis

Front 44

Back 44

Rhomboideus Capitis

Front 45

Back 45

A: Rhomboideus Capitis
B: Rhomboideus Cervicis
C: Rhomboideus Thoracis

Front 46

Back 46

Rhomboideus Muscle (Capitis & Cervicis)

Front 47

Back 47

Rhomboideus Muscle (Thoracis)

Front 48

Back 48

A: Rhomboideus Capitis
B: Rhomboideus Cervicis
C: Rhomboideus Thoracis

Front 49

Back 49

Latissimus Dorsi (cutaneous trunci removed)

Front 50

Back 50

Latissimus Dorsi (cutaneous trunci removed)

Front 51

Back 51

A: Latissimus Dorsi
B: Thoracolumbar fascia

Front 52

Back 52

Latissimus Dorsi

Front 53

Back 53

Serratus Ventralis Muscle

Front 54

Back 54

Serratus Ventralis Muscle

Front 55

Back 55

Serratus Ventralis Cervicis

Front 56

Back 56

Serratus Ventralis Thoracis

Front 57

Back 57

A: Serratus Ventralis Cervicis
B: Serratus Ventralis Thoracis

Front 58

Back 58

Thoracic limb attachment to the trunk
A: Trapezius
B: Rhomboideus
C: Serratus Ventralis
D: Deep Pectoral

Front 59

Brachial

Back 59

Humerus

"Arm"

Front 60

Antebrachial

Back 60

Radius & ulna

"Forearm"

Front 61

Scapular

Back 61

Scapula

"shoulder"

Front 62

Extrinsic Muscles

Back 62

Muscles that attach the limb to the trunk

Front 63

Intrinsic Muscles

Back 63

Muscles located between the bones of the limbs

Front 64

Superficial Pectoral Origin

Back 64

Descending: First sternebra (manubrium)

Transverse: Sternebrae 1-3 and fibrous raphe on the ventral midline

Front 65

Superficial Pectoral Insertion

Back 65

Crest of the greater tubercle of the humerus

Front 66

Superficial Pectoral Innervation

Back 66

Cranial pectoral nn.

Front 67

Superficial Pectoral Actions

Back 67

- When not bearing weight: Adduct the limb

-When bearing weight: Prevent the limb form being abducted

Front 68

Deep Pectoral Origin

Back 68

Sternebrae 1-8 and fibrous raphe on the ventral midline; deep abdominal fascia in the region of the xiphoid cartilage

Front 69

Deep Pectoral Insertion

Back 69

- Lesser tubercle of the humerus
- Greater tubercle and crest of the greater tubercle via a aponeurosis
- Medial brachial fascia

Front 70

Deep Pectoral Muscle Innervation

Back 70

Caudal pectoral nn.

Front 71

Deep Pectoral Actions

Back 71

- When the limb is advanced & fixed: Pull the trunk cranially

- When the limb is not bearing weight: Draw the limb caudally

-Adduct the limb

- Support the trunk

Front 72

Feline Pectoral Muscles

Back 72

It is very difficult to separate the descending and transverse portions of the superficial pectoral muscle

In addition they have a 2 additional pectoral muscles: Pectoantebrachialis and Xiphihumeralis

Front 73

Pectoantebrachialis

Origination, Insertion & Action

Back 73

Origination: Manubrium

Insertion: Superficial fascia of the proximal end of the antebrachium (ulna)

Action: Draws the arm medially (adducts)

Front 74

Xiphihumeralis

Origination, Insertion, & Action

Back 74

Origination: Xiphoid process

Insertion: Proximal end the of humerus, deep to the insertion of the deep pectoral m., via a long, thin tendon

Action: Same as deep pectoral muscle

Front 75

Brachiocephalicus Components

Back 75

Cleidocephalicus

(Cleidocervicalis & Cleidomastoideus)

Cleidobrachialis

Front 76

Brachiocephalicus Attachment

Back 76

Clavicular Intersection

Front 77

Cleidocephalicus Attachment

Back 77

Cleidocervicalis: Cervical raphe

Cleidomastoideus: Mastoid process of the temporal bone

Front 78

Cleidocephalicus Innervation

Back 78

- Accessory n. (cranial nerve XI)

- Ventral brs. of cervical spinal nn.

Front 79

Brachiocephalicus Action

Back 79

- Advance the limb

- Extend the shoulder joint

- Draw the head and neck to the side

Front 80

Cleidobrachialis Attachment

Back 80

Distal end of the cranial border of the humerus (dog) or ulna (cat)

Front 81

Cleidobrachialis Innervation

Back 81

Brachiocephalic nerve (ventral br. of C6 spinal n.)

Front 82

Sternohyoideus Origin

Back 82

- Manubrium

- First costal Cartilage

Front 83

Sternohyoideus Insertion

Back 83

Basihyoid bone

Front 84

Sternohyoideus Innervation

Back 84

Ventral brs. of cervical spine nn.

Front 85

Sternohyoideus Action

Back 85

Draw the tongue and larynx caudally

Front 86

Sternothyroideus Origin

Back 86

First costal cartilage

Front 87

Sternothyroideus Insertion

Back 87

Caudolateral surface of the thyroid cartilage

Front 88

Sternothyroideus Innervation

Back 88

Ventral brs. of cervical spinal nn.

Front 89

Sternothyroideus Action

Back 89

Draw the larynx & tongue caudally

Front 90

Omotransversarius Origin

Back 90

Distal end of the spine of the scapula and acromion

Front 91

Omotransversarius Insertion

Back 91

- Transverse process of the first cervical vertebra (wing of the atlas)

- Basioccipital bone near the tympanic bulla (FELINE)

Front 92

Omotransversarius Innervation

Back 92

Accessory n. (cranial nerve XI)

Front 93

Omotransversarius Action

Back 93

- Advance the limb

- Flex the neck laterally

Front 94

Trapezius Origin

Back 94

- Cervical portion: Median raphe of the neck (C3- C7)
- Thoracic portion: Supraspinous ligament ( T1-T9)

Front 95

Trapezius Insertion

Back 95

Spine of the scapula

Front 96

Trapezius Innervation

Back 96

Accessory n. (cranial nerve XI)

Front 97

Trapezius Action

Back 97

- Cervical portion: Draw the scapula craniodorsally

- Thoracic portion: draw the scapula caudodorsally

- Acting together: Elevate and abduct the thoracic limb

Front 98

Rhomboideus Origin

Back 98

Capitis: Nuchal crest of the occipital bone

Cervicis: Median raphe of the neck

Thoracis: Spinous processes of T1-T7

Front 99

Rhomboideus Insertion

Back 99

Dorsal border and adjacent surfaces of the scapula

Front 100

Rhomboideus Innervation

Back 100

Ventral brs. of cervical and thoracic spinal nn.

Front 101

Rhomboideus Action

Back 101

- Elevate the forelimb (scapula)
- Draw the scapula against the trunk

Front 102

Latissimus Dorsi Origin

Back 102

- Thoracolumbar fascia from the spinous processes of T7 - L7 (dog) ir T4 - T6 (cat)

- Last 2-3 ribs

Front 103

Latissimus Dorsi Insertion

Back 103

- Teres major tuberosity of the humerus
- Teres major tendon

Front 104

Latissimus Dorsi Innervation

Back 104

Thoracodorsal n.

Front 105

Latissimus Dorsi Action

Back 105

- Draw the limb caudally

- Flex the shoulder joint

Front 106

Serratus Ventralis Origin

Back 106

SV Cervicis: Transverse process of C2/C3 - C7

SV Thoracis: First 7-8 ribs (dog) or 9-10 ribs (cat), ventral to middle region

Front 107

Serratus Ventralis Insertion

Back 107

Serrated face of the scapula

Front 108

Serratus Ventralis Action

Back 108

- Support the trunk by slinging the body between the forelimbs (along with deep pectoral muscle)

- Depresses the scapula

Front 109

Synsarcosis

Back 109

Muscular attachments connecting the thoracic limb to the trunk

Front 110

Serratus Ventralis Innervation

Back 110

- Ventral brs. of cervical spine nn.

- Long thoracic n.