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Lab 4 – 3.2: Shoulder
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Deltoid Origin: spine of scapula, acromion, anterior lateral 1/3 clavicle Insertion: Deltoid tuberosity (humerus) Innervation: Axillary Nerve (C5,C6) Function: abduction of arm
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Deltoid (cont) Note: posterior humeral circumflex artery supplies deltoid
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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
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Supraspinatus (cut) Note: Superior transverse scapular ligament
Suprascapular Nerve (inferior to ligament) Suprascapular artery (superior to ligament)
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Suprascapular Artery Right Subclavian artery thyrocervical trunk suprascapular artery Supplies suprascapular muscle and glenohumeral joint Greater tubercle
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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
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Circumflex scapular Artery
Branch from suprascapular artery – supplies infraspinatus muscle and glenohumeral joint Greater tubercle
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Suprascapular Vein Drains posterior scapular region Greater tubercle
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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 Gray’s anatomy for students (GS): pg. 656
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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 GS: pg. 679
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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
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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 GS: pg. 689
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Pectoralis Major *active during forced inspiration Origin:
medial clavicle sternum, costal cartilages 1-7, aponeurosis of external abdominal oblique muscle Insertion: intertubercular sulcus of humerus (lateral lip) Innervation: Lateral pectoral nerve (C5-7) Medial pectoral nerve (C8-T1) Function: Adduction, medial rotation, and flexion of humerus (shoulder joint) *active during forced inspiration
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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
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Deltopectoral Triangle
Also known as “clavipectoral” triangle Bordered by pectoralis major muscle, deltoid muscle, and clavicle Passageway for cephalic vein Greater tubercle
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Axillary Vein Drainage: Pectoral, shoulder, and scapular regions
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Axillary Nerve Motor Innervates the deltoid muscle
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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)
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Latissimus Dorsi Function: Extends, adducts, and medially rotates humerus
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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
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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
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Deltoid
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Axillary Nerve
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Supraspinatus
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Infraspinatus
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Teres Minor Muscle Gray’s anatomy for students (GS): pg. 656
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Teres Major Muscle GS: pg. 679
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Long head of the triceps brachii
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Serratus anterior GS: pg. 689
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Pectoralis Major
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Pectoralis Minor
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Latissimus Dorsi
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Arteries and Nerves 2 1 3 4
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