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Brachial Plexus

The Ins and Outs of the Brachial Plexus

AnswerQuestion
Pectoralis Major - origin Origin: anternal medial clavicle, sternum, costal cartilages, aponeurosis of external oblique
P. Major - insertion Insertion: lateral intertubercular sulcus
P, Major - Action Action: adducts, flexes, and medially rotates humerus
P, Major - Innervation lateral and medial pectoral nerves
P. Minor - origin origin - ribs 3-5
P. Minor - insertion coracoid process of scapula
P. Minor - Action stabilizes scapula and draws it forward
P. Minor - Innervation Medial Pectoral Nerve
Subclavius - Origin 1st Rib
Subclavius - Insertion middle of clavicle
Subclavius - Action depresses clavicle
Subclavius - Innervation nerve to subclavius
Latissimus Dorsi - Origin Spines of 6 thoracic vertebrae, thorocolumnar fascia, iliac crest, lower 3 or 4 ribs.
Latissimus Dorsi - Insertion floor of intertubercular sulcus
Latissimus Dorsi - Action adducts, extends and rotates arm medially
Latissimus Dorsi - Innervation Thoracodorsal Nerve
Rhomboid Minor - Origin spinous processes of C7-T1, ligamentum nuchae
Rhomboid Minor - Insertion vertebral border of scapula at root of the spine
Rhomboid Minor - Action retracts and rotates scapula, fixes scapula to thoracic wall
Rhomboid Minor - Innervation dorsal scapular nerve (C4, C5)
Rhomboid Major - Origin spinous process of T2-T5
Rhomboid Major - Insertion vertebral border of scapula below root of spine
Rhomboid Major - Action retracts and rotates scapula, fixes scapula to thoracic wall
Rhomboid Major - Innervation Dorsal Scapular Nerve (C4, C5)
Teres Minor - Origin lower axillary border of scapula
Teres Minor - Insertion lower facet of greater tubercle of humerus
Teres Minor - Action Rotates arm laterally (with infraspinatous)
Teres Minor - Innervation Axillary Nerve
Teres Major - Origin dorsal inferior angle of scapula
Teres Major - Insertion crest of lesser tubercle of humerus
Teres Major - Action extends and rotates arm medially (with latissimus dorsi)
Teres Major - Innervation Lower Subscapular Nerve
Deltoid - Origin inferior surface of lateral 1/3 of clavicle, acromion, inferior margin of spine of scapula
Deltoid - Insertion deltoid tuberousity of humerus
Deltoid - action abducts, extends, and flexes arm; assists in medial and lateral rotation
Deltoid - Innervation axillary nerve
Supraspinatous - Origin supraspinous fossa
Supraspinatous - Insertion upper facet of greater tubercle of humerus
Supraspinatous - Action initiates abduction, stabilizes shoulder joint (with other rotator cuff muscles), "resists" upper pull of deltoid
Supraspinatous - Innervation suprascapular nerve
Infraspinatous - Origin Infraspinous Fossa
Infraspinatous - Insertion middle facet of greater tubercle of humerus
Infraspinatous - Action Rotates arm laterally (with Teres minor)
Infraspinatous - Innervation suprascapular nerve
Trapezius - Origin EOP, superior nuchal line, ligamentum nuchae, spinous processes of C7 and all 12 thoracic spines
Trapezius - Insertion lateral 1/3 of clavicle, spine of scapula, acromion
Trapezius - Action adducts scapula, tilts chin forward, draws acromion backward, rotates scapula.
Trapezius - Innervation Spinal Accessory Nerve (CN XI) and C3 and C4
Levator Scapulae - Origin transverse processes of C1-C4
Levator Scapulae - Insertion vertebral border of scapula above root of spine
Levator Scapulae - Action elevates scapula, if scapula is fixed inclines neck
Levator Scapulae - Innervation Dorsal scapular nerve (mainly) and direct branches of C3 and C4
Biceps Brachii - Origin short head: coracoid process of scapula; long head - supraglenoid tubercle of scapula
Biceps Brachii - Insertion radial tuberosity
biceps brachii - Action powerful flexor of forearm at elbow
biceps brachii - Innervation musculocutaneous nerve (C5 and C6)
Coracobrachialis - Origin coracoid process of scapula
Coracobrachialis - Insertion middle of medial surface and border of humerus
Coracobrachialis - Action flexes and adducts arm at the shoulder
Coracobrachialis - Innervation musculocutaneous nerve (C5 and C6)
Brachialis - Origin distal half of anterior humerus
Brachialis - Insertion tuberosity and anterior surface of coronoid process of ulna
Brachialis - Action powerful flexor of forearm at elbow
Brachialis - Innervation musculocutaneous nerve (C5 and C6); radial nerve sends a minor branch (C7)
Triceps Brachii - Origin long head: infraglenoid tubercle of scapula, lateral head: posterior surface of humerus, medial head: posterior surface of humerus inferior to radial groove
Triceps Brachii - Insertion olecranon process of ulna
Triceps Brachii - Action all 3 heads: extend forearm at elbow: long head extends humerus at shoulder joint
Triceps Brachii - Innervation Radial Nerve (C7, C8)
Created by: igelderloos
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