Muscle Pennix

Sartorius

Action: flexion, abduction, and laterally rotates thigh

Vastus Lateralis (under sartorius)

Extension of leg and stabilize knee

Rectus Femoris(Middle under sartorius)

Action: extension of leg and flexion of thigh at hip

Orgin: anterior inferior iliac spine and superior margin of acetabulum (rim of hip socket)

Insertion: Tibial tuberosity through patellar ligament

Vastus Medialis (Close to inside theigh)

Extension of leg

Adductor Longus (space with nerves)

Action: adducts, flexes, and medially rotates thigh

Adductor Femoris (section split into two)

Action: Adduction of thigh

Semitendinosus(bottom of theigh)

Action: extends thigh and flexes knee , medially rotates tibia when knee is flexed

Semimembraneous (under Adductor Femoris)

Action: extends thigh and flexes knee

Gracilis(Bottom flap of leg)

Action: adducts thigh , flexes, and medially rotates leg

Rhomboideus Capitis (Head)

Action- stabilizes scapula

-draws scapula cranially(towards head) and dorsally (midline)

Orgin: spinous processes C7-T1 and T2-T5

Insertion: medial border of scapula

Latissimus dorsi(giant v shape muscle side of back)

Action: arm extension, arm adductor, medially rotates arm

Supraspinatus (part under flap near shoulder on back)

Action: abduction of arm

Acromiodeltoid(directly on shoulder)

Action: Abduction of humerus

Orgin: acromion and spine of scapula

Insertion: Deltoid tuberosity of humerus

Spinodeltoid(little section under armpit area)

Action: elevates, extends, and rotates the humerus

Spinotrapezius(triangle on back)

Action- stabilizes, depress scapula, adducts (retracts), and rotates scapula.

Lateral Tricep Brachii head

Action: extension forearm against resistance

Orgin: posterior shaft of humerus

Insertion: olecranon of ulna

Tibialis Anterior (front of leg)

Action: dorsiflexion

Orgin: lateral condyle of tibia and upper 2/3 of tibial shaft and interosseous membrane

Insertion: inferior surface of medial cuneiform and first metatarsal bone

Gastrocnemius(calf or under portion of leg)

Action: plantar flexes foot

Orgin: two heads from lateral and medial condyles of femur

Insertion: posterior calcaneus

Brachioradialis (under palmaris Longus)

Action-synergist of flexion of forearm

Orgin-lateral suprachondular of distal end humerus

Insertion-radial styloid process

Extensor digitorum Lateralis (under brachioradialis)

Action: extend lateral four digits and dorsiflex ankle

Bicep Femoris (back of theigh)

Action: extension of thigh , flexion of knee, laterally rotates leg when knee is flexed

Orgin: long head: ischial tuberosity of pelvis short head: linea aspera and lateral suprachondular line of femur

Insertion: head of fibula and lateral condyle of tibia

Gluteus maximus(next to top of tail)

Action: major extensor of thigh

external oblique (flap on side )

Action- Flex vertebral column and compress abdominal wall when contracted

-aid in trunk rotation and lateral flexion

Rectus Abdominis (down side of middle)

Action- Flex and rotate lumbar region of vertebral column

Bicep Brachii

Action: Flexion and supination of arm

Orgin: Short head: coracoid process of scapula , long head: supraglenoid tubercle and lip of glenoid cavity of scapula and into intertubercular sulcus of humerus

Insertion: radial tuberosity

Pectoantebrachialis(across middle of chest)

Action= pull humerus toward chest or adduction

Pectoralis Major

Action-adduction

Origin: sternal end of clavicle, sternum, and cartilage of ribs 1-6

Insertion- humerus

Pectoralis Minor

Action- Adduction

Xiphihumeralis (under pectoralis minor)

Action= adduction of the forelimb Orgin=xiphoid process of sternum Insertion=humerus

Sternocleidomastoid (lump)

Action-flex and laterally rotate head

Orgin-manubrium of sternum and medial portion of clavicle

Insertion - mastoid process of temporal bone and superior nuchal line of occipital

Sternohyoid (under blue line/vein)

Action- depresses larynx/hyoid bone for speaking and swallowing

Digastric (connects to bottom of chin)

Opens mouth by depresses mandible and elevate hyoid bone for swallowing/speech

Epitrochlearis (circle flap under arm near armpit )

Action- elbow extension and forearm supination (twisting/rotate)

Tricep Brachii long head (back of arm)

Action- extension of forearm

Orgin- Infraglenoid tubercle of scapula

Insertion- olecranon process of ulna

Palmaris Longus

Action-flexion of wrist and tension of skin

Origin-medial epicondyle humerus

Insertion- palmar aponeurosis