2 Muscle Packet

Pectoralis Major (Clavicular Head) - Proximal Attachment

Anterior surface of medial half of clavicle

Pectoralis Major (Sternocostal Head) - Proximal Attachment

Anterior surface of sternum, superior 6 costal cartilages, and aponeurosis of external oblique muscle

Pectoralis Major - Distal Attachment

Lateral lip of intertubercular groove of humerus

Pectoralis Major (Clavicular Head) - Innervation

Lateral and medial pectoral nerves C6

Pectoralis Major (Sternocostal Head) - Innervation

Lateral and medial pectoral nerves C7, C8

Pectoralis Major (Clavicular Head) - Action

Flexes, adducts, and internally rotates humerus

Pectoralis Major (Sternocostal Head) - Action

Extends from a flexed position, adducts, and internally rotates humerus

Pectoralis Minor - Proximal Attachment

3rd to 5th ribs near their costal cartilages

Pectoralis Minor - Distal Attachment

Coracoid process of scapula

Pectoralis Minor - Innervation

Medial pectoral n. (C8, T1)

Pectoralis Minor - Action

Stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall

Trapezius - Proximal Attachment

Medial third of superior nuchal line, external occipital protuberance, nuchal ligament, SP C7 - T12

Trapezius - Innervation

Motor: Spinal accessory nerve (CN XI), Pain and proprioception: AR C3, C4

Upper Trapezius - Distal Attachment

Lateral third of clavicle and acromion

Upper Trapezius - Action

Elevates, adducts, and upwardly rotates scapula

Middle Trapezius - Distal Attachment

Medial margin of acromion and superior lip of spine of scapula

Middle Trapezius - Action

Adducts the scapula

Lower Trapezius - Distal Attachment

Spine of scapula

Lower Trapezius - Action

Depresses, adducts, upwardly rotates scapula

Serratus Anterior - Proximal Attachment

External surfaces of lateral parts of 1st to 8th ribs

Serratus Anterior - Distal Attachment

Anterior surface of medial border of scapula

Serratus Anterior - Innervation

Long thoracic nerve (C5, C6, C7)

Serratus Anterior - Action

Abducts and upwardly rotates scapula; stabilizes the medial border of the scapula against thoracic wall

Rhomboid Major - Proximal Attachment

SP T2-5

Rhomboid Minor - Proximal Attachment

Nuchal ligament and SP C7, T1

Rhomboid Major - Distal Attachment

Medial border of scapula from level of spine to inferior angle

Rhomboid Minor - Distal Attachment

Medial border at root of spine of scapula

Rhomboid Major and Minor - Innervation

Dorsal scapular n. (C4, C5)

Rhomboid Major and Minor - Action

Adducts and downwardly rotates scapula

Latissimus Dorsi - Proximal Attachment

SP T7-T12, thoracolumbar fascia, iliac crest, and inferior 4 ribs

Latissimus Dorsi - Distal Attachment

Floor of intertubercular groove of humerus. Posterior surface of inferior angle of scapula

Latissimus Dorsi - Innervation

Thoracodorsal n. (C6, C7, C8)

Latissimus Dorsi - Action

Extends, adducts, and internally rotates humerus

Coracobrachialis - Proximal Attachment

Tip of coracoid process of scapula

Coracobrachialis - Distal Attachment

Middle 1/3 of medial surface of the humerus

Coracobrachialis - Action

Shoulder flexion and adduction

Coracobrachialis - Innervation

Musculocutaneous (C5, C6, C7)

Teres Major - Proximal Attachment

Posterior surface of inferior angle of scapula

Teres Major - Distal Attachment

Medial lip of intertubercular groove of humerus

Teres Major - Innervation

Lower Subscapular n. (C5, C6)

Teres Major - Action

Extends, adducts, and internally rotates humerus

Supraspinatus - Proximal Attachment

Supraspinous fossa of scapula

Supraspinatus - Distal Attachment

Superior facet of greater tubercle of humerus

Supraspinatus - Innervation

Suprascapular n. (C4, C5, C6)

Supraspinatus - Action

Initiates abduction, abducts humerus; depresses and compresses humeral head in glenoid

Infraspinatus - Proximal Attachment

Infraspinous fossa of scapula

Infraspinatus - Distal Attachment

Middle facet of greater tubercle of humerus

Infraspinatus - Innervation

Suprascapular n. (C5, C6).

Infraspinatus - Action

Externally rotates humerus; depresses and compresses humeral head in glenoid

Teres Minor - Proximal Attachment

Middle part of lateral border of scapula

Teres Minor - Distal Attachment

Inferior facet of greater tubercle of humerus

Teres Minor - Innervation

Axillary n. (C5, C6)

Teres Minor - Action

Externally rotates humerus; depresses and compresses humeral head in glenoid

Subscapularis - Proximal Attachment

Subscapular fossa

Subscapularis - Distal Attachment

Lesser tubercle of humerus

Subscapularis - Innervation

Upper and Lower subscapular n.'s (C5, C6, C7)

Subscapularis - Action

Internally rotates humerus; depresses and compresses humeral head in glenoid

Supinator - Proximal Attachment

Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa, crest of ulna

Supinator - Distal Attachment

Lateral, posterior, and anterior surfaces of the proximal 1/3rd of radius

Supinator - Action

Forearm supination

Supinator - Innervation

Radial (deep branch) (C7, C8)

Pronator Teres (Ulnar Head) - Proximal Attachment

coronoid process of ulna

Pronator Teres (Humeral Head) - Proximal Attachment

medial epicondyle of humerus (common flexor origin)

Pronator Teres - Distal Attachment

Lateral mid shaft of the radius

Pronator Teres - Action

Forearm pronation, elbow flexion

Pronator Teres - Innervation

Median (C6, C7)

Pronator quadratus - Proximal Attachment

Distal 1/4 of anterior surface of ulna

Pronator quadratus - Distal Attachment

Distal 1/4 of anterior surface of radius

Pronator quadratus - Action

Forearm pronation. Deep fibers bind radius and ulna together

Pronator quadratus - Innervation

Median (anterior interosseous) (C8, T1)

Tensor Fascia Lata - Proximal Attachment

ASIS and anterior part of iliac crest

Tensor Fascia Lata - Distal Attachment

Iliotibial band (ITB), which inserts on Gerdy's tubercle on the lateral tibial condyle

Tensor Fascia Lata - Innervation

Superior gluteal n. (L5, S1)

Tensor Fascia Lata - Action

Abducts, internally rotates, and flexes hip. Can assist with knee flexion/extension (via its insertion into ITB)

Sartorius - Proximal Attachment

ASIS and superior part of notch inferior to it

Sartorius - Distal Attachment

Superior surface of medial tibia (pes anserine)

Sartorius - Action

Hip flexion, abduction, and external rotation, knee flexion, and tibial internal rotation

Sartorius - Innervation

Femoral (L2, L3)

Gluteus Medius - Proximal Attachment

External surface of ilium between anterior and posterior gluteal lines

Gluteus Medius - Distal Attachment

Lateral surface of greater trochanter of femur

Gluteus Medius - Innervation

Superior gluteal n. (L5, S1)

Gluteus Medius - Action

Keeps pelvis level when ipsilateral limb is WBing and contralateral limb is NWBing. Anterior fibers: abduct, flex, and internally rotate the hip. Posterior fibers: abduct, extend, and externally rotate the hip

Gluteus Minimus - Proximal Attachment

External surface of ilium between anterior and inferior gluteal lines

Gluteus Minimus - Distal Attachment

Anterior surface of greater trochanter of femur

Gluteus Minimus - Innervation

Superior gluteal n. (L5, S1)

Gluteus Minimus - Action

Abducts and internally rotates hip