Pectoralis Major

Action: Flexes upper arm at the shoulder, adducts and medially rotates shoulder

Origin: Clavicle, Sternum and Ribs

Insertion: Intertubercular groove of humerus

Sternocleidomastiod

Action: Flexes neck

Origin: Manubrium of sternum and Clavicle

Insertion: Mastiod process of the temporal bone

Sternohyoid

Action: Depresses hyoid

Origin: Manubrium of sternum

Insertion: Hyoid bone

Diagastric

Action: Elevates hyoid bone

 Platysma

Action: Depresses mandible

Deltoid

Action: Abducts humerus at shoulder

Origin: Clacivle and Spine of scapula

Insertion: Deltoid tuberosity of humerus

Trapezius

Action: Extends head, rotates and retracts scapula

Origin: Occipital bone and Vertebrae

Insertion: Acromion and spine of scapula, and Clavicle

Levator Scapulae

Action: Elevates and adducts scapula

Supraspinatus

Action: Abduction of the arm at the shoulder

Origin: Supraspinous fossa

Insertion: Greater tubercle of the humerus

Infraspinatus

Action: Lateral rotation of the arm at the shoulder

Origin: Infraspinous fossa

Insertion: Greater tubercle of the humerus

Teres Minor

Action: Lateral rotation of the arm at the shoulder

Origin: Lateral margin of scapula

Insertion: Greater tubercle of the humerus

Subscapularis

Action: Medial rotation of the arm at the shoulder

Origin: Subscapular fossa

Insertion: Lesser tubercle of the humerus

Teres Major

Action: Extends, Medially rotates and adducts humerus

Mylohyoid

Action: Elevates hyoid

Origin: Mandible

Insertion: Hyoid bone

Pectoralis Minor

Action: Draws scapula forward

Origin: Ribs

Insertion: Coracoid process of scapula

Triceps brachii

Action: Extends forearm at elbow

Insertion: Olecranon process of the ulna

Brachialis

Action: Flexes forearm at the elbow

Origin: Humerus

Insertion: Coroniod process of ulna

Brachioradialis

Action: Flexes forearm at elbow

Origin: Humerus

Insertion: Styloid process of radius

Extensors

Action: Extends hand at the wrist

Biceps brachii

Action: Flexes forearm at the elbow, supinates forearm at the elbow

Origin: Coracoid process of scapula

Insertion: Radial tuberosity

Flexors

Action: Flexes hand at wrist

Transverse abdominus

Action: Compresses abdominal contends

Internal obliques

Action: Flexes and laterally rotates vertebral column

External Obliques

Action: Flexes and laterally rotates vertebral column

Rectus abdominus

Action: Flexes and rotates vertebral column

Origin: Pubic crest and symphysis

Insertion: Xiphoid process of sternum

External intercostals

Action: Elevates ribcage

Serratus Anterior

Action: Rotates scapula, abducts upper arm

Latissimus dorsi

Action: Extends arm at the shoulder, adducts and medially rotates arm

Rhomboid muscles

Action: Retracts scapula

Extensor digitorum longus

Action: Dorsiflexes foot

Tibialis anterior

Action: Dorsiflexes the foot

Biceps femoris

Action: Extends thigh at hip and flexes lower leg at knee

Origin: Ischial tuberosity

Insertion: Tibia

Gluteus medius

Action: Abducts and medially rotates thigh at hip

Gluteus maximus

Action: Extends thigh at hip

Semimembranosus

Action: Extends leg at thigh, flexes lower leg at knee

Origin: Ischial tuberosity

Insertion: Medial condyle of the tibia and lateral condyle of the femur

Semitendinosus

Action: Extends leg at thigh, flexes lower leg at knee

Origin: Ischial tuberosity

Insertion: Tibia

Rectus femoris

Action: Extends lower leg at knee

Origin: Anterior superior iliac spine

Insertion: Tibial tuberosity

Vastus medialis

Action: Extends lower leg at the knee

Origin: Linea aspera of femur

Insertion: Tibial tuberosity

Vastus Lateralis

Action: Extends lower leg at knee

Origin: Greater trochanter of femur

Insertion: Tibial tuberosity

Adductor longus and femoris

Action: Adducts thigh at hip

Pectineus

Action: Adducts thigh at the hip

Tensor fascia latae

Action: Flex, abduct and medially rotate thigh

Gracilis

Action: Adducts thigh at hip

Origin: Pubis

Insertion:  Medial condyle of tibia

Sartorius

Action: Flexes, abducts and laterally rotates thigh (crosses legs)

Origin: Anterior superior iliac spine

Insertion: Tibia

Peroneus

Action: Plantar flexes foot

Gastrocnemius

Action: Plantar flexes foot

Soleus

Action: Plantar flexes foot

Mentalis

Action: Wrinkles chin

Depressor labii inferioris

Action: Draws lips inferiorly

Orbicularis oris

Action: Puckers lips

Risorius

Action: Draws lips laterally (tenses lips)

Zygomaticus

Action: Smiling

Buccinator

Action: Compresses cheek (whistling)

Frontalis

Action: Raises eyebrows

Levator labii superioris

Action: Raises upper lip

Orbicularis oculi

Action: Blinking and Squinting

Masseter

Action: Elevates mandible (closes jaw)

Temporalis

Action: Elevates and retracts mandible (closes jaw)