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Lab 4 – 3.2: Shoulder Deltoid • Origin: spine of scapula, acromion, anterior lateral 1/3 clavicle • Insertion: Deltoid tuberosity (humerus) • Innervation: Axillary Nerve (C5,C6) • Function: abduction of arm Deltoid (cont) • Note: posterior humeral circumflex artery supplies deltoid Supraspinatus • Origin: supraspinous fossa • Insertion: Greater tubercle of the humerus (superior surface) • Innervation: Suprascapular nerve (C5,C6) • Function: abduction of arm at glenohumeral joint Greater tubercle Supraspinatus (cut) • Note: – Superior transverse scapular ligament – Suprascapular Nerve (inferior to ligament) – Suprascapular artery (superior to ligament) Suprascapular Artery • Right Subclavian artery thyrocervical trunk suprascapular artery • Supplies suprascapular muscle and glenohumeral joint Greater tubercle Infraspinatus • Origin: medial 2/3 of intraspinous fossa • Insertion: Greater tubercle of the humerus (middle posterior surface) • Innervation: Suprascapular nerve (C5,C6) • Function: lateral rotation of arm at glenohumeral joint Greater tubercle Circumflex scapular Artery • Branch from suprascapular artery – supplies infraspinatus muscle and glenohumeral joint Greater tubercle Suprascapular Vein • Drains posterior scapular region Greater tubercle Teres Minor Muscle •Origin: lateral border of the scapula •Insertion: greater tubercle of the humerus •Innervation: Axillary nerve •Function: Rotator Cuff Muscle lateral rotation of the arm at the glenohumeral joint Teres Major Muscle Origin: Scapula (inferior angle and lateral border) Insertion: humerus (medial lip of the intertubercular sulcus) Innervation: lower subscapular nerve Function: • medial rotation of arm • extension of the arm • Adduction of the arm Long head of the triceps brachii Origin: scapula (infraglenoid tubercle) Insertion: olecranon of ulna Innervation: Radial nerve Function: • extension of the forearm • Accessory adductor/extensor of the arm Serratus anterior Origin: lateral surface of ribs 1-9 Insertion: scapula (medial border) Innervation: long thoracic nerve Function: • Abduction of the scapula • Medial rotation of scapula • Keeps medial border and inferior angle of scapula opposed to thoracic wall Pectoralis Major • Origin: – medial clavicle – sternum, costal cartilages 17, – aponeurosis of external abdominal oblique muscle • Insertion: intertubercular sulcus of humerus (lateral lip) • Innervation: – Lateral pectoral nerve (C5-7) – Medial pectoral nerve (C8T1) • Function: Adduction, medial rotation, and flexion of humerus (shoulder joint) *active during forced inspiration Pectoralis Minor Origin: ribs 3-5 Insertion: Coracoid process of scapula Innervation: Medial pectoral nerves Function: Depresses tip of shoulder; protracts scapula Active during forced inspiration Deltopectoral Triangle • Also known as “clavipectoral” triangle • Bordered by pectoralis major muscle, deltoid muscle, and clavicle • Passageway for cephalic vein Greater tubercle Axillary Vein Drainage: Pectoral, shoulder, and scapular regions Axillary Nerve • Motor • Innervates the deltoid muscle Latissimus Dorsi • Origin: Spinous processes of TVII through LV and sacrum, iliac crest, ribs X–XII • Insertion: Humerus (floor of intertubercular sulcus) • Innervation: Thoracodorsal nerve (C6–C8) Latissimus Dorsi • Function: Extends, adducts, and medially rotates humerus Quadrangular Space Location: Shoulder (posterior scapular region) Boundaries: • Superior boundary: Inferior margin of teres minor • Lateral boundary: Surgical neck of the humerus • Inferior boundary: Superior margin of teres major • Medial boundary: Lateral margin of the long head of the triceps brachii Function: • Passageway for posterior circumflex humeral artery and vein and axillary nerve Quadrangular space Triangular Space Location: shoulder (posterior) Boundaries: • Superior boundary: inferior teres minor muscle • Inferior boundary: superior teres major muscle • Lateral boundary: medial long head of triceps brachii muscle Function: • Passageway for circumflex scapular artery and vein Deltoid Axillary Nerve Supraspinatus Infraspinatus Teres Minor Muscle Teres Major Muscle Long head of the triceps brachii Serratus anterior Pectoralis Major Pectoralis Minor Latissimus Dorsi Arteries and Nerves 2 1 3 4