slideshow: shoulder region anterior
Post on 08-Jan-2017
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Anterior Shoulder Region
The anterior shoulder or pectoral region is formed by
• Pectoralis Major
• Pectoralis Minor
Pectoralis Major has two heads
Pectoralis Major has two heads
• sternocostal head
Pectoralis Major has two heads
• sternocostal head
• clavicular head
Anterior View
Pectoralis Major attaches to the lateral lip of the bicipital groove of the proximal humerus
Pectoralis Major
Is supplied by the
medial and lateral pectoral nerves
Pectoralis Major
Sternocostal head adducts and medially rotates the arm
clavicular head adducts and flexes the arm
Pectoralis Minor attaches to the coracoid process of the scapula
Pectoralis Minor attaches to the coracoid process of the scapula
Anterior view
Pectoralis Minor
Arises from ribs 3,4,5
It protracts the scapula
Pectoralis Minor
Is supplied by the
Medial pectoral nerves
The anterior fibres of
Deltoid muscle
lie at the lateral aspect of the anterior chest wall
Muscles Summary
Anterior Chest WallPectoralis Major
Origin Clavicular head: anterior surface of medial half of clavicle; Sternocostal head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle
Insertion Lateral lip of intertubercular groove of humerus
Action Adducts and internally rotates humerus; moves scapula anteriorly and inferiorly;
Nerve Supply Lateral and medial pectoral nerves (C5, C6, C7, C8, and T1)
Blood Supply pectoral branch of thoracoacromial trunk
Anterior Chest Wall
Pectoralis MinorOrigin 3rd to 5th ribs near their costal
cartilagesInsertion Medial border and superior
surface of coracoid process of scapula
Action Stabilises scapula, pulls it inferiorly and anteriorly against thoracic wall
Nerve Supply Medial pectoral nerves; (C8 and T1)
Blood Supply Pectoral branch of the thoracoacromial trunk
Anterior Chest Wall
Serratus AnteriorOrigin Superolateral surfaces of
upper 8 or 9 ribs at the side of chest
Insertion Medial border of scapulaAction Pulls scapula forward and
upward; abducts and rotates it; stabilises medial border of scapula
Nerve Supply Long thoracic nerve (C5, C6, C7)
Blood Supply Circumflex scapular artery
DeltoidOrigin Lateral third of clavicle,
acromion, and spine of scapulaInsertion Deltoid tuberosity of humerus
Action Anterior part: flexes and internally rotates arm; Middle part: abducts arm; Posterior part: extends and externally rotates arm
Nerve Supply Axillary nerve (C5 and C6)
Blood Supply Deltoid branch of thoracoacromial artery
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