1 / 16

Anatomy of Shoulder Part 2

Anatomy of Shoulder Part 2. Ligaments. Sternoclavicular Joint Ligaments Extremely weak because of boney arrangement Anterior sternoclavicular Prevents upward displacement of clavicle Posterior sternoclavicular Prevents upward displacement of clavicle Interclavicular

rayya
Download Presentation

Anatomy of Shoulder Part 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Anatomy of Shoulder Part 2

  2. Ligaments • Sternoclavicular Joint Ligaments • Extremely weak because of boney arrangement • Anterior sternoclavicular • Prevents upward displacement of clavicle • Posterior sternoclavicular • Prevents upward displacement of clavicle • Interclavicular • Prevents lateral displacement of clavicle • Costoclavicular • Prevents lateral and upward displacement of clavicle

  3. Ligaments • Consists of Anterior, posterior, superior, and inferior portions • Coracoclavicular ligaments joins the coracoid process and clavicle helps maintain the position of the clavicle relative to the acromion • Coracoclavicular • Divided into • Coniod and trapezoid ligaments • Coracoacromial ligament • Connects the coracoid to the acromion

  4. Ligaments • Glenohumeral Joint Ligaments • Superior Ligament • Middle Ligament • Inferior Ligament • Produce major restraint in shoulder flexion, extension and rotation

  5. Ligaments • Glenohumeral Joint Ligaments • Anterior • Tense in extension, abduction or external rotation • Posterior • Tension is in extension with external rotation • Middle • Tension in flexion and external rotation • Inferior • Tense in abduction, extended or externally rotated

  6. Ligaments • Glenohumeral Ligaments • Inferior GH Ligament • Primarily a check against both anterior and posterior dislocation of humeral head • Transverse ligament • Retains the long biceps tendon within the bicipital groove

  7. Muscles • Dynamic motion • Establish stability to compensate for a great deal of mobility • Flexion, extension, abduction, adduction, horizontal adduction/abduction, internal/external rotation and circumduction

  8. Muscles • 1st group • Originate on axial skeleton • Attach to humerus • Latissiumus dorsi • Pectoralis major • 2nd group • Originates on scapula • Attach to humerus • Deltoid • Teres major • coracobrachialis • Rotator cuff muscles • Subscapularis, supraspinatus, infraspinatus and teres minor • Tendons adhere to the articular capsule and serve as reinforcing structures • Biceps and triceps • Attach on the glenoid and effect elbow motion

  9. Muscles • Scapular Muscles • 3rd group • Levator scapulae • Trapezius • Rhomboids • Serratus anterior • Important in providing dynamic stability to the shoulder complex

  10. Bursae • Most important Subacromial Bursa • Between coracoacromial arch and glenohumeral capsule • Reinforced by the supraspinatus tendon • Subacromial bursa • Easily subjected to trauma in overhead position • Compressed under coracoacromial arch

  11. Nerve Supply • Spinal nerve roots • 5th cervical vertebra through 1st Thoracic vertebra • Create the brachial plexus • Innervate muscles of upper extremity • Axillary (C5-C6) • Musculocutaneous (C5-C7) • Subscapular (C5-C6) • Suprascapular (C5-C6) • Dorsal scapular (C5) • Pectoral (C5-T1) • Radial (C5-T1)

  12. Functional Anatomy • Rotator Cuff Muscles • Subscapularis, infraspinaturs, supraspinatus and teres minor (along with long head of biceps) • Provide dynamic stability • Control position • Prevent excessive displacement of the humeral head • Supraspinatus • Compresses humeral head • Infraspinatus, teres minor and subscapularis • Depress the humeral head during overhead movements

  13. Functional Anatomy • Glenohumeral joint capsule • As muscle contracts they dynamically tighten the joint capsule • Which helps center the humeral head to the glenoid • Dynamic movement and stabilization of shoulder • Also needs scapulothoracic, acromioclavicular and sternocalvicular joint to move as well

  14. Functional Anatomy • Muscles that produce movement of the scapula on the thorax help maintain the position of the glenoid relative to the moving humerus • Levator scapula and upper trapezius (elevate scapula) • Middle trapezius and rhomboids (adduct scapula) • Lower trapezius (adducts and depresses scapula) • Serratus anterior (abducts and upwardly rotates the scapula)

  15. Scapulohumeral Rhythm • Describes the movement of the scapula relative to the movement of the humerus throughout a full range of abduction • Humerus elevates to 30 degrees: no movement of scapula • Setting phase • 30 to 90 degrees: scapula abducts and upwardly rotates • 90 degrees to full abduction: scapula abducts and upwardly rotates 1 degree for each 1 degree of humeral elevation • Clavicular movement must occur at both the SC and AC joints • Clavicle must elevate 40 degrees and rotate in a poster superior direction at least 10 degrees

More Related