Masseter Muscle

Origin: 

Insertion:

Action:

Origin: Zygomatic Arch

Insertion: Lateral side of the mandible

Action: Elevates the mandible to close the mouth when chewing

Trapezius

Origin: 

Insertion:

Action:

Origin: Dorsal aspect of the neck & Thorax

Insertion: Spine of scapula

Action: Elevates and abducts the forelimbs

Latissimus Dorsi

Origin: 

Insertion:

Action:

Origin: Spinous process of the lumbar and last seven or eight thoracic vertebrae

Insertion:Teres major tuberosity of the humerus and the teres major tendon

Action: Draws limbs caudally; flexes the shoulder joint.

Biceps Brachii

Origin: 

Insertion:

Action:

Origin: Caudolateral aspect of proximal humerus

Insertion: Ulna & radial tuberosities

Action: Flexes elbow

Triceps Brachii

Origin: 

Insertion:

Action:

Origin: Caudal border of scapula/ proximal border of humerus

Insertion: Olecranon of ulna (elbow)

Action: Extends elbow/ Flexes shoulder

Digital Extensors

Origin: 

Insertion:

Action:

Origin: Lateral Epicondyle of humerus

Insertion: Dorsal surface of distal phalanges of digits 2,3,4, and 5

Action: Extends the carpus and digits 

Digital Flexors

Origin: 

Insertion:

Action:

Origin: Medial epicondyle of the humerus

Insertion:palmar aspect of the middle phalanges of digits 2,3,4, and 5

Action: flexes the carpal and digital joints

Longissimus

Origin: 

Insertion:

Action:

Origin: Sacrum

Insertion: Transverse processes of all throracic vertebrae

Action: Extension of vertebral column

Pectoralis

Origin: 

Insertion:

Action:

Origin: Cranial sternum

Insertion: Greater tubercle of the humerus

Action: adducts the thoracic limb

External Abdominal Oblique

Origin: 

Insertion:

Direction of striations:

Origin: Thoracolumbar fasia and last rib

Insertion: Linea Alba

Direction of Striations: downward like putting hands in pockets (V)

Internal Abdominal Oblique

Origin: 

Insertion:

Direction of striations:

Origin: Thoracolumbar fascia

Insertion: Linea Alba

Direction of striations: Upwards like a pointy party hat (^)

Rectus Abdominus

Origin: 

Insertion:

Direction of Striation:

Origin: Sternum

Insertion: Pubis

Direction of Striation: Vertical line (ll)

Transverse Abdominus

Origin: 

Insertion:

Direction of Striations:

Origin: Medial surface of last four/five ribs and transverse process of lumbar vertebrae

Insertion: Linea Alba

Direction of Striations: Horizontal striations (---)

Biceps Femoris

Origin: 

Insertion:

Action:

Origin: Ischiatic tuberosity of the pelvis

Insertion: Patella, proximal tibia and tubercalcei 

Action: extends the hip joint

(Sciatic nerve is under this)

Quadriceps Femoris

Origin: 

Insertion:

Action:

Origin: rectus femoris on th eilium

Insertion: tibial tuberosity

Action: extends the stifle joint and flexes the hip joint

Gluteals

Origin: 

Insertion:

Action:

Origin: Sacrum and coccygeal vertebrae

Insertion: greater trochanter of femur

Action: abducts the limb and extends hip

Semitendinosus

Origin: 

Insertion:

Action:

Origin: Ischiatic Tuberosity

Insertion: Tibia and tuber calcanei

Action: Extends the hip, flexes the stifle, and extends the tarsal joint.

Semimembranosus

Origin: 

Insertion:

Action:

Origin: Ischiatic tuberosity

Insertion: Femur & Tibia

Action: Extends the hip and flexes the stifle

Sartorius

Origin: 

Insertion:

Action:

(Sara)

Origin:On or near the crest of the ilium 

Insertion: cranial part inserts on the patella, caudal part on the cranial border of the tibia

Action: flexes hip & extends stifle

Gracilis

Origin: 

Insertion:

Action:

(Grace)

Origin: Pelvic symphysis

Insertion: Crainial border of tibia

Action: Adducts the limb, flexes stifle, and extends the hip and hock.

Gastrocnemius

Origin: 

Insertion:

Action:

Origin: Medial and lateral supracondylar turberosities of the femur

Insertion:proximal surface of the tuber calcanei

Action: Extends the tarsus and flexes the stifle

(achillies tendon is located underneith this muscle)