Muscle Packet

Psoas Major - Origin

Sides of bodies of T12-L5 and IV discs, TP of lumbar vertebrae

Psoas Major - Insertion

Lesser trochanter of femur

Psoas Major - Innervation

Anterior Rami L1, L2

Psoas Major - Action

Hip Flexion

Rectus Femoris - Origin

AIIS and ilium superior to acetabulum

Rectus Femoris - Insertion

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Rectus Femoris - Innervation

Femoral L3, L4

Rectus Femoris - Action

Hip Flexion, knee extension

Vastus Lateralis - Origin

Linea aspera (lateral lip), greater trochanter

Vastus Lateralis - Insertion

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Lateralis - Innervation

Femoral L3, L4

Vastus Lateralis - Action

Knee extension

Vastus Medialis - Origin

Linea aspera (medial lip), intertrochanteric line

Vastus Medialis - Insertion

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Medialis - Innervation

Femoral L3, L4

Vastus Medialis - Action

Knee extension

Vastus Intermedius - Origin

Anterior and lateral shaft of femur

Vastus Intermedius - Insertion

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Intermedius - Innervation

Femoral L3, L4

Vastus Intermedius - Action

Knee Extension

Tibialis Anterior - Origin

Lateral condyle and superior lateral tibia, and interosseous membrane

Tibialis Anterior - Insertion

Medial and inferior surfaces of medial cuneiform and base of 1st metatarsal

Tibialis Anterior - Innervation

Deep fibular L4

Tibialis Anterior - Action

Ankle dorsiflexion, foot inversion

Extensor Hallucis Longus - Origin

Middle surface of anterior fibula, and interosseous membrane

Extensor Hallucis Longus - Insertion

Distal phalanx of hallux

Extensor Hallucis Longus - Innervation

Deep fibular L5

Extensor Hallucis Longus - Action

MP and IP extension of hallux, ankle dorsiflexion

Fibularis Longus - Origin

Head and superior lateral surface of fibula

Fibularis Longus - Insertion

Base of 1st metatarsal, medial cuneiform

Fibularis Longus - Innervation

Superficial fibular L5, S1

Fibularis Longus - Action

Foot eversion, ankle plantarflexion (weak)

Fibularis Brevis - Origin

Inferior lateral surface of fibula

Fibularis Brevis - Insertion

Tuberosity of base of 5th metatarsal

Fibularis Brevis - Innervation

Superficial fibular L5, S1

Fibularis Brevis - Action

Foot eversion, ankle plantarflexion (weak)

Gastrocnemius Medial head - Origin

popliteal surface of femur superior to medial condyle.

Gastrocnemius - Insertion

Calcaneus via calcaneal tendon

Gastrocnemius - Innervation

Tibial S1, S2

Gastrocnemius - Action

Ankle plantarflexion, knee flexion

Soleus - Origin

Head and superior surface of posterior fibula, soleal line and medial border of tibia, tendinous arch between bony attachments

Soleus - Insertion

Calcaneus via calcaneal tendon

Soleus - Innervation

Tibial nerve S1, S2

Soleus - Action

Ankle plantarflexion

Anterior Deltoid - Origin

Lateral third of clavicle

Anterior Deltoid - Insertion

Deltoid tuberosity of humerus

Anterior Deltoid - Innervation

Axillary C5

Anterior Deltoid - Action

Shoulder Flexion, Humoral Internal Rotation

Middle Deltoid - Origin

Acromion

Middle Deltoid - Insertion

Deltoid tuberosity of humerus

Middle Deltoid - Innervation

Axillary C5

Middle Deltoid - Action

Shoulder Abduction

Posterior Deltoid - Origin

Spine of scapula

Posterior Deltoid - Insertion

Deltoid tuberosity of humerus

Posterior Deltoid - Innervation

Axillary C5

Posterior Deltoid - Action

Shoulder Extension, Humoral External Rotation

Biceps Brachii Short head - Origin

coracoid process

Biceps Brachii - Insertion

Radial tuberosity and fascia of the forearm via bicipital aponeurosis

Biceps Brachii - Innervation

Musculocutaneous C6

Biceps Brachii - Action

Forearm Supination, elbow flexion, shoulder flexion

Triceps Brachii Long Head - Origin

infraglenoid tubercle

Triceps Brachii - Insertion

Olecranon process and fascia of forearm

Triceps Brachii - Innervation

Radial C7

Triceps Brachii - Action

Elbow extension

Brachioradialis - Origin

Proximal 2/3 of lateral supra-epicondylar ridge of humerus

Brachioradialis - Insertion

Lateral surface of distal end of radius proximal to styloid process

Brachioradialis - Innervation

Radial C6

Brachioradialis - Action

Elbow flexion (maximal in mid-pronated position)

Extensor Carpi Radialis Longus - Origin

Lateral supra-epicondylar ridge of humerus

Extensor Carpi Radialis Longus - Insertion

Dorsal aspect of base of 2nd metacarpal

Extensor Carpi Radialis Longus - Innervation

Radial C6, C7

Extensor Carpi Radialis Longus - Action

Wrist extension, radial deviation

Extensor Carpi Radialis Brevis - Origin

Lateral epicondyle of humerus

Extensor Carpi Radialis Brevis - Insertion

Dorsal aspect of base of 3rd metacarpal

Extensor Carpi Radialis Brevis - Innervation

Radial (deep branch) C7

Extensor Carpi Radialis Brevis - Action

Wrist extension, radial deviation

Flexor Carpi Radialis - Origin

Medial epicondyle (common flexor origin)

Flexor Carpi Radialis - Insertion

Base of 2nd metacarpal

Flexor Carpi Radialis - Innervation

Median C7

Flexor Carpi Radialis - Action

Wrist flexion, radial deviation

Abductor Pollicis Brevis - Origin

Flexor retinaculum and tubercles of scaphoid and trapezium

Abductor Pollicis Brevis - Insertion

Lateral side of base of the proximal phalanx of 1st digit

Abductor Pollicis Brevis - Innervation

Median (recurrent branch) C8

Abductor Pollicis Brevis - Action

CMC abduction and opposition of 1st digit

Dorsal Interossei (1-4) - Origin

Adjacent sides of 2 metacarpals

Dorsal Interossei (1-4) - Insertion

Base of proximal phalanx and extensor expansions of digits 2-4. 1 & 2: radial side of digits 2 & 3. 3 & 4: ulnar side of digits 3 & 4

Dorsal Interossei (1-4) - Innervation

Ulnar (deep branch) T1

Dorsal Interossei (1-4) - Action

Abduction of digits 2,3,4 from axial line and assists lumbricals with MP flexion, PIP, DIP extension.

Sternocleidomastoid - Origin

Mastoid process and lateral half of superior nuchal line

Sternocleidomastoid Sternal head - Insertion

Anterior surface of manubrium of sternum

Sternocleidomastoid - Innervation

Spinal accessory (CN XI, motor); Anterior Rami C3, C4 (pain and proprioception).

Sternocleidomastoid - Action

Bilaterally: Flexes the neck. If cervical vertebrae are fixed, may elevate manubrium and medial clavicles Unilaterally: Ipsilateral lateral neck flexion and contralateral rotation

Flexor Carpi Ulnaris Humeral head - Origin

medial epicondyle of humerus (common flexor origin)

Flexor Carpi Ulnaris - Insertion

Pisiform, hook of hamate, 5th metacarpal

Flexor Carpi Ulnaris - Innervation

Ulnar C8

Flexor Carpi Ulnaris - Action

Wrist flexion, ulnar deviation

Extensor Carpi Ulnaris - Origin

Lateral epicondyle of humerus, posterior border of the ulna via a shared aponeurosis

Extensor Carpi Ulnaris - Insertion

Dorsal aspect of base of 5th metacarpal

Extensor Carpi Ulnaris - Innervation

Radial (posterior interosseous) C7

Extensor Carpi Ulnaris - Action

Wrist extension, ulnar deviation