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Shoulder Girdle KIN 245.

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Presentation on theme: "Shoulder Girdle KIN 245."— 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 Angles Acromion process Spine of scapula
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 Head adduction elevation depression
outward rotation Head extension / hyperextension rotation lateral flexion

12 Levator Scapulae (p129) Origin Insertion Action
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 Insertion
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 Insertion
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

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

18 Subclavius (p133) Origin Insertion Action
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: muscles
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 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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