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Shoulder Girdle KIN 245. Bones of the Shoulder Girdle Scapula (shoulder) Clavicle (small key) Link to Axial skeleton via sternoclavicular joint (an anterior.

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Presentation on theme: "Shoulder Girdle KIN 245. Bones of the Shoulder Girdle Scapula (shoulder) Clavicle (small key) Link to Axial skeleton via sternoclavicular joint (an anterior."— Presentation transcript:

1 Shoulder Girdle KIN 245

2 Bones of the Shoulder Girdle Scapula (shoulder) Clavicle (small key) Link to Axial skeleton via sternoclavicular joint (an anterior joint) Lack of posterior attachment to the axial skeleton allows for a wide ROM Functions to allow attachment areas for numerous muscles that move the shoulder and elbow

3 Landmarks Borders  superior, medial, lateral Angles  inferior, superior Acromion process Spine of scapula Glenoid fossa Coracoid process (like a crow’s beak) Supraspinatus, Infraspinatus, Subscapular fossa

4 Joints of the Shoulder Girdle Sternoclavicular  sternum (manibrum) and clavicle  arthrodial (gliding) joint  ligaments anterior sternoclavicular ligament posterior sternoclavicular ligament costoclavicular ligament interclavicular ligament

5 Joints of the Shoulder Girdle Acromioclavicular  Acromion Process of scapula and clavicle  arthrodial (gliding) joint  ligaments coracoclavicular ligaments  trapezoid ligament  conoid ligament superior & inferior acromioclavicular ligaments

6 Joints of the Shoulder Girdle Scapulothoracic Joint  Scapula and thoracic region  not really synovial joint  supported by muscles, not ligaments

7 Movements allowed by the Shoulder Girdle Abduction (Protraction) Adduction (Retraction) Inward (downward) rotation: inferior angle moves medially Outward (upward) rotation Depression: inferior movement Elevation: superior movement

8 Muscles of the Shoulder Girdle Posterior  trapezius  levator scapula  rhomboids (major and minor) Anterior  pectoralis minor  seratus anterior  subclavius

9 Trapezius (p134) Origin: Superior nuchal line Occipital protuberance Ligamentum nuchae C7 and T12 vetebrae

10 Trapezius Insertion  Lateral 1/3 of clavicle  Acromion process of scapula  Spine of scapula

11 Trapezius Action  Scapula adduction elevation depression outward rotation  Head extension / hyperextension rotation lateral flexion

12 Levator Scapulae (p129) Origin  Transverse processes of the 1st four cervical vertebrae Insertion  Vertebral (medial) border of the scapula above base of scapular spine Action  Scapula elevation, inward rotation, adduction

13 Rhomboid Muscles (p131) Origin  Lower part of ligamentum nuchae  Spinous process of the 7th cervical and 1st five thoracic vert. Insertion  Vertebral border of the scapula

14 Rhomboid Muscles Action  Scapular adduction inward rotation elevation

15 Serratus Anterior (p132) Origin  lateral, anterior surface of the upper 8/9 ribs Insertion  Anterior aspect of the vertebral border of the scapula

16 Serratus Anterior Action  Scapular abduction outward rotation depression

17 Pectoralis Minor (p130) Origin  Anterior surfaces of the 3rd - 5th ribs Insertion  Coracoid process of scapula Action  Rib elevation  Scapular depression

18 Subclavius (p133) Origin  Superior aspect of 1st rib (around costal cartilage) Insertion  Inferior groove mid-portion of clavicle Action  scapular depression  stabilization of sternoclavicular jt.

19 Summary Shoulder Girdle  bones: clavicle, scapula  joints: sternoclavicular acromioclavicular scapulothoracic  muscles anterior: pectoralis minor, serratus anterior, subclavius posterior: levator scapulae, rhomboids, trapezius

20 Shoulder Girdle The arm travels through a wide range of movements, the scapula cooperates by placing the glenoid fossa in the most favorable position for the head of the humerus (scapulohumeral rhythm)

21 Movements of the Shoulder Girdle Clavicle  elevation, depression  protraction, retraction (or forward and backward horizontal movements) Scapula  elevation, depression  abduction, adduction  inward and outward rotation

22 Muscle Analysis Chart Identify muscles that move the scapula  abduction  adduction  elevation  depression  upward rotation  downward rotation

23 Muscles that move the scapula abduction  serratus anterior  pectoralis minor adduction  trapezius (middle and lower fibers)  rhomboids

24 Muscles that move the scapula elevation  trapezius (upper & middle fibers)  levator scapulae  rhomboids (slight) depression  trapezius (lower fibers)  pectoralis minor  subclavius (clavicle depression)

25 Muscles that move the scapula outward rotation  trapezius (middle and lower fibers)  serratus anterior inward rotation  rhomboids  Levator scapulae


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