Muscles of Pectoral Girdle

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Physical Education and Sport
Gail Amort- Larson

Muscles of the Pectoral Girdle and Upper Limbs •Four groups: muscles that position pectoral girdle, muscles that move the arm, muscles that move the forearm and hand, muscles that move the hand and fingers •Any muscle that attaches to ribs can be an accessory muscle of respiration Pectoral girdle •Made of clavicle and scapula •Clavicle: Holds shoulder in place, increases range of motion, only bone with bony attachment in axial skeleton -Smooth superior surface, rough inferior surface -Medial end/Sternal end(rounder,smaller) connects clavicle to sternum at sternoclavicular joint -Lateral end/acromial(broader/flatter) end connects clavicle at acromioclavicular joint with scapula -Conoid tubercle is on the inferior surface at acromial end -Costal tuberosity is at sternal end Sternum: -Manubrium (where clavicle connects, called sternoclavicular joint) -Xiphoid process(usually cartilage) •Scapula: -Usually sits over ribs 2-7 -triangular in shape -Superior border, lateral border(axillary border), medial border(vertebral border) -There are 3 projections: 1. Scapular spine comes across posterior side,divides dorsal body of scapula in two parts 2. Acromion: flat enlargement on posterior lateral end 3. Coracoid process: is small anterior projection Scapula Bone Markings -Suprascapular notch: indentation medial to the base of the coracoid process -Supraspinous fossa: Area superior to the scapular spine -Infraspinous fossa: Area inferior to the scapular spine -Glenoid cavity: proximal end of humerus sits here -Subscapular fossa:forms most of the anterior side of scapula -Supraglenoid tubercle: Marks origin of biceps brachii long head -Infraglenoid tubercle: Marks origin of triceps brachii long head -Glenohumeral joint: shoulder joint Sternoclavicular Joint •synovial joint between medial end of clavicle and manubrium of sternum •serves to anchor scapula to axial skeleton, considered part of shoulder joint •divided into two synovial cavities by an articular disc •articular capsule is tense and dense, provides stability but limiting movement. reinforced by 2 accessory ligaments, anterior sternoclavicular ligament and posterior sternoclavicular ligament Also two extracapsular ligaments: •Interclavicular ligament: interconnects clavicles and reinforces superior portions of adjacent articular capsules, firmly attached to superior border of manubrium, prevents dislocation when shoulder is depressed •Costoclavicular ligament: broad, exte
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