1, 2, 3, 4 Muscle Packet

Psoas Major - Proximal Attachment

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

Psoas Major - Distal Attachment

Lesser trochanter of femur

Psoas Major - Innervation

Anterior Rami L1, L2

Psoas Major - Action

Hip Flexion

Rectus Femoris - Proximal Attachment

AIIS and ilium superior to acetabulum

Rectus Femoris - Distal Attachment

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Rectus Femoris - Innervation

Femoral L3, L4

Rectus Femoris - Action

Hip Flexion, knee extension

Vastus Lateralis - Proximal Attachment

Linea aspera (lateral lip), greater trochanter

Vastus Lateralis - Distal Attachment

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Lateralis - Innervation

Femoral L3, L4

Vastus Lateralis - Action

Knee extension

Vastus Medialis - Proximal Attachment

Linea aspera (medial lip), intertrochanteric line

Vastus Medialis - Distal Attachment

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Medialis - Innervation

Femoral L3, L4

Vastus Medialis - Action

Knee extension

Vastus Intermedius - Proximal Attachment

Anterior and lateral shaft of femur

Vastus Intermedius - Distal Attachment

Quadriceps tendon; Patella, tibial tubercle via patellar ligament

Vastus Intermedius - Innervation

Femoral L3, L4

Vastus Intermedius - Action

Knee Extension

Tibialis Anterior - Proximal Attachment

Lateral condyle and superior lateral tibia, and interosseous membrane

Tibialis Anterior - Distal Attachment

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 - Proximal Attachment

Middle surface of anterior fibula, and interosseous membrane

Extensor Hallucis Longus - Distal Attachment

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 - Proximal Attachment

Head and superior lateral surface of fibula

Fibularis Longus - Distal Attachment

Base of 1st metatarsal, medial cuneiform

Fibularis Longus - Innervation

Superficial fibular L5, S1

Fibularis Longus - Action

Foot eversion, ankle plantarflexion (weak)

Fibularis Brevis - Proximal Attachment

Inferior lateral surface of fibula

Fibularis Brevis - Distal Attachment

Tuberosity of base of 5th metatarsal

Fibularis Brevis - Innervation

Superficial fibular L5, S1

Fibularis Brevis - Action

Foot eversion, ankle plantarflexion (weak)

Gastrocnemius Medial head - Proximal Attachment

popliteal surface of femur superior to medial condyle

Gastrocnemius Lateral Head - Proximal Attachment

lateral femoral condyle

Gastrocnemius - Distal Attachment

Calcaneus via calcaneal tendon

Gastrocnemius - Innervation

Tibial S1, S2

Gastrocnemius - Action

Ankle plantarflexion, knee flexion

Soleus - Proximal Attachment

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

Soleus - Distal Attachment

Calcaneus via calcaneal tendon

Soleus - Innervation

Tibial S1, S2

Soleus - Action

Ankle plantarflexion

Anterior Deltoid - Proximal Attachment

Lateral third of clavicle

Anterior Deltoid - Distal Attachment

Deltoid tuberosity of humerus

Anterior Deltoid - Innervation

Axillary C5

Anterior Deltoid - Action

Shoulder Flexion, Humoral Internal Rotation

Middle Deltoid - Proximal Attachment

Acromion

Middle Deltoid - Distal Attachment

Deltoid tuberosity of humerus

Middle Deltoid - Innervation

Axillary C5

Middle Deltoid - Action

Shoulder Abduction

Posterior Deltoid - Proximal Attachment

Spine of scapula

Posterior Deltoid - Distal Attachment

Deltoid tuberosity of humerus

Posterior Deltoid - Innervation

Axillary C5

Posterior Deltoid - Action

Shoulder Extension, Humoral External Rotation

Biceps Brachii Short head - Proximal Attachment

coracoid process

Biceps Brachii Long head - Proximal Attachment

supraglenoid tubercle and superior labrum

Biceps Brachii - Distal Attachment

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 - Proximal Attachment

infraglenoid tubercle

Triceps Brachii Lateral Head - Proximal Attachment

posterior surface of the humerus superior to radial (spiral) groove

Triceps Brachii Medial Head - Proximal Attachment

posterior surface of the humerus inferior to radial (spiral) groove

Triceps Brachii - Distal Attachment

Olecranon process and fascia of forearm

Triceps Brachii - Innervation

Radial C7

Triceps Brachii - Action

Elbow extension

Brachioradialis - Proximal Attachment

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

Brachioradialis - Distal Attachment

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 - Proximal Attachment

Lateral supra-epicondylar ridge of humerus

Extensor Carpi Radialis Longus - Distal Attachment

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 - Proximal Attachment

Lateral epicondyle of humerus

Extensor Carpi Radialis Brevis - Distal Attachment

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 - Proximal Attachment

Medial epicondyle

Flexor Carpi Radialis - Distal Attachment

Base of 2nd metacarpal

Flexor Carpi Radialis - Innervation

Median C7

Flexor Carpi Radialis - Action

Wrist flexion, radial deviation

Abductor Pollicis Brevis - Proximal Attachment

Flexor retinaculum and tubercles of scaphoid and trapezium

Abductor Pollicis Brevis - Distal Attachment

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) - Proximal Attachment

Adjacent sides of 2 metacarpals

Dorsal Interossei (1-4) - Distal Attachment

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 - Proximal Attachment

Mastoid process and lateral half of superior nuchal line

Sternocleidomastoid Sternal head - Distal Attachment

Anterior surface of manubrium of sternum

Sternocleidomastoid Clavicular head - Distal Attachment

Superior surface of medial third of clavicle

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 - Proximal Attachment

medial epicondyle of humerus

Flexor Carpi Ulnaris Ulnar head - Proximal Attachment

olecranon and posterior border of ulna (via aponeurosis)

Flexor Carpi Ulnaris - Distal Attachment

Pisiform, hook of hamate, 5th metacarpal