Presentation on theme: "Shoulder. A.A.A. Contest Answer the Animated AnimaLS Throughout the slide show there will be slides with written questions. When you see a question,"— Presentation transcript:
A.A.A. Contest Answer the Animated AnimaLS Throughout the slide show there will be slides with written questions. When you see a question, think of the answer, don’t answer it out loud --- this way, everyone gets a chance to think. Some slides with a question will have animations of animals cross the screen. When this happens, write down the answer on a post it note and quickly WALK it up to post on the board at the front of the class. The first person to post the correct answer on the board is the winner! You get to put a sticker on the “AAA Contest” board. The contest will continue throughout the quarter… at the end of the quarter, the person with the most stickers wins!
Humerus & The shoulder girdle: Scapula Clavicle Bones of Shoulder
The shoulder girdle attachment of the upper extremity to the trunk It consists of two bones: the scapula (shoulder blade) clavicle (collarbone)
Shoulder Girdle Scapula & Clavicle Link to Axial skeleton via sternoclavicular 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
What is the only true synovial joint where there is an articulation between the humerus and the axial skeleton? Sternoclavicular joint
Landmarks of Scapula Borders –superior, medial (vertebral), lateral (axillary) Angles –inferior, superior Acromion process Spine of scapula Glenoid fossa Coracoid process Supraspinatus fossa, Infraspinatus fossa, Subscapular fossa Supraglenoid tubercle & Infraglenoid Tubercle
Posterior View of Scapula
Anterior View of Shoulder Complex: With Scapula, Humerus and Clavicle
Anterior Posterior Lateral View of Scapula (Sagittal Cross Section)
Learning Activity: 1)Label the landmarks of the scapula 1 st try from memory (in a couple of minutes Zefire will put up a labeled picture so you can double check your answers, make corrections and additions)
Joints of the Shoulder Girdle 1.Sternoclavicular joint 2. Acromioclavicular Joint 3.Glenohumeral Joint (4) Scapulothoracic Joint - NOT really a synovial joint –supported by muscles, not ligaments
Joints of the Shoulder Girdle 1. Sternoclavicular –Sternum and clavicle –gliding joint –ligaments anterior sternoclavicular ligament posterior sternoclavicular ligament costoclavicular ligament interclavicular ligament
2. Acromioclavicular –Acromion Process of scapula and clavicle –gliding joint –ligaments coracoclavicular ligaments –trapezoid ligament –conoid ligament superior & inferior acromioclavicular ligaments Joints of the Shoulder Girdle
The joint is surrounded by a weak capsule that is reinforced by strong inferior and superior * acromioclavicular ligaments. Further strengthening occurs through the coracoclavicular ligament formed of two strong fibre bundles, the lateral trapezoid and medial conoid ligaments. Acromioclavicular Joint
3. Glenohumeral –Glenoid fossa and head of the humerus –Ball and socket Joint that allows most movement of entire body Allows movement in 3 planes Joints of the Shoulder Girdle:
Labrum: a ring of fibrous cartilage surrounding the glenoid stabilizes the joint (makes a deeper socket) Fossa “Shoulder Joint”: Glenohumeral Joint Fossa Process
“Shoulder Joint”: Glenohumeral Joint
What is the bony landmark on the scapula that articulates with the humerus? Glenohumeral Joint: Glenoid Fossa
Movements allowed by the Scapulothoracic “joint” Abduction (Protraction) Adduction (Retraction) Depression: inferior movement Elevation: superior movement Downward (inward) rotation: inferior angle moves medially Upward (outward) rotation
Movements allowed by the Scapulothoracic “joint” Abduction (Protraction) – scapula move away from spine Adduction (Retraction) – scapula move closer to spine
Bring shoulder blades closer together. A widening across front of collarbone will occur. Try to keep space between the hands constant. Reach fingers forward. A widening between shoulder blades will occur. Try to keep space between the hands constant. ProtractionRetraction
Movements allowed by the Scapulothoracic “joint” Depression: inferior movement Elevation: superior movement
Movements allowed by the Scapulothoracic “joint” Downward (inward) rotation: inferior angle moves medially, and acromion moves downward Upward (outward) rotation: inferior angle moves laterally, and acromion moves upward
Elevation Superior movement of the shoulder girdle; moving the scapula up. Scapular Movements in Action What is the movement at the scapula as this man contracts his muscles?
Scapular Movements in Action Downward Rotation Rotary movement of the scapula; Moving inferior angle of scapula medially and downward. Besides some depression of the scapula, what other primary motion is occurring at the scapula during the pull up?
Scapular Movements in Action Upward Rotation Rotary movement of the scapula; Moving inferior angle of scapula laterally and upward.
Abduction (Protraction) Forward movement away the midline of the body; moving the scapula away from the spine. Scapular Movements in Action During the push-up phase of the movement, what is the scapular action?
Adduction (Retraction) Backward movement toward the midline of the body; moving the scapula back toward the spine. Scapular Movements in Action What scapular movement is occurring during contraction?
The scapula moves normally on the thorax only if the two joints by which it attaches to the axial skeleton are also free to move: Sternoclavicular joint Acromioclavicular joint
Clavicular protraction and Retraction CLAVICULAR ELEVATION AND DEPRESSION BACKWARD AND FORWARD ROTATION OF CLAVICLE OCCUR Sternoclavicular (SC) joint movements:
Mobility at the AC joint allows the scapula to move in three dimensions so that it follows the contours of the ribcage. Acromioclavicular joint Scapular WINGING TIPPING UPWARD and DOWNWARD ROTATION
During shoulder elevation, the scapula and clavicle must rotate upwardly
Humeral Flexion and Extension
There’s nothing like a good shoulder
Learning Activity: Individually, without your notes Take 10 minutes to write an outline of the movements possible at the Glenohumeral joint Scapulothoracic “joint” Then, answer these questions: Which of these joints allows more movement: AC - acromioclavicular joint or sternoclavicular joint? In how many planes does this more moveable joint allow movement? Try drawing diagrams to see if that helps
Learning Activity: 2) In small groups, your answers; make sure everyone understands. 3) With a scapula model, take turns, with each person showing the scapulothoracic movements on a group member’s back (while other group member(s) watch and help).