Scapula Region and Shoulder Joint Flashcards
What are the bones of the Pectoral Girdle?
- Clavicle
- Scapula
- Sternum
- Humerus
What joint is the shoulder joint?
The Glenohumeral Joint–> Synovial Joint
What are the features of a Synovial Joint?
- Capsule with a fibrous outer layer and inner synovial membrane
- Hyaline Cartilage lining the bony articulating surfaces
- Synovial Fluid
- Ligaments to reinforce
What feature of the Glenohumeral joint makes it more mobile than the hip joint?
The Glenoid fossa is shallow, allows for more rotation
What are the ligaments of the Glenohumeral Joint?
- Glenohumeral Ligaments
- Coracohumeral Ligament
- Transverse Humeral Ligament
Describe the Glenohumeral Ligaments
3 bands: Superior, Middle and Inferior, Runs with the joint capsule from the Glenoid Fossa to the Anatomical Neck of the Humerus
Describe the Coracohumeral Ligament
Attaches the base of the coracoid process to the Greater Tuberosity of the Humerus
Describe the Transverse Humeral Ligament
Holds to tendon of the Long heads of Biceps in the Intertubercular Groove
What is Bursae?
It is a fluid-filled pouch, lined by synovial membrane containing synovial fluid
What is the function of Bursae?
Reduce friction between bones and soft tissue
What are the Rotator Cuff Muscles?
- Subscapularis
- Supraspinatus
- Infraspinatus
- Teres Minor
What are the attachments of the Rotator Cuff Muscles?
Greater Tuberosity–> Supraspinatus, Infraspinatus and Theres Minor
Lesser Tuberosity–> Subscapularis
What are the origins of Subscapularis?
Subscapular Fossa
What is the function of the Subscapularis?
Medially Rotate the arm
What is the Nerve Supply of Subscapularis?
Upper and Lower Subscapular Nerves
What are the origins of Supraspinatus?
Supraspinous Fossa
What is the function of Supraspinatus?
Abducts the arm and assists the Deltoid Muscle
What is the nerve supply of Supraspinatus?
Suprascapular Nerve
What are the origins of Infraspinatus?
Infraspinous Fossa
What is the function of Infraspinatous?
Lateral Rotation of the Arm
What is the nerve supply of Infraspinatus?
Suprascapular Nerve
What are the origins of Teres Minor?
Posterior Surface of Scapula
What is the function of Teres Minor?
Lateral Rotation of the Arm
What is the nerve supply of Trees Minor?
Axillary Nerve
What are the origins of Teres Major?
Lower Lateral Part of the Scapula
Where does Teres Major Attach?
Medial edge of the bicipital groove of the Humerus
What is the function of Teres Major?
- Adducts the Shoulder
2. Medial Rotation of Arm
What is the nerve supply of Teres Major?
- Lower Subscapular Nerve
What are the origins of Deltoid?
Clavicle and Scapula
Where does Deltoid attach?
Deltoid tuberosity on the Humerus
What is the function of the Deltoid?
- Anterior Fibres–> Flex the Shoulder
- Posterior Fibres–> Extend the Shoulder
- Middle Fibres–> Abducts the Shoulder
What muscles are involved in Elevation of the Scapula?
- Superior Trapezius
- Rhomboids
- Levator Scapulae
What muscles are involved in Depression of the Scapula?
- Pectoralis Minor
2. Serratus Anterior
What muscles are involved in Protraction of the Scapula?
- Pectoralis Minor
2. Serratus Anterior
What muscles are involved in Retraction of the Scapula?
- Rhomboids
- Latissimus Dorsi
- Middle Trapezius
What muscles are involved in Rotation of the Scapula?
- Serratus Anterior
- Superior Trapezius
- Inferior Trapezius
What muscles are involved in Medial Rotation of the Shoulder?
- Subscapularis
- Teres Major
- Sternal Head of Pectoralis Major
- Anterior Deltoid
- Latissimus Dorsi
What muscles are involved in Lateral Rotation of the Shoulder?
- Infraspinatus
- Teres Minor
- Posterior Deltoid
What muscles are involved in Flexion of the Shoulder?
- Pectoralis Major
- Anterior Deltoid
- Biceps Brachii
- Coracobrachialis
What muscles are involved in Extension of the Shoulder?
- Latissimus Dorsi
- Posterior Deltoid
- Teres Major
- Triceps
What muscles are involved in Adduction of the Shoulder?
- Pectoralis Major
- Latissimus Dorsi
- Teres Major
What muscles are involved in Abduction of the Shoulder?
- Deltoid
- Supraspinatus
- Trapezius and Serratus Anterior
- Infraspinatus
- Teres Minor
What is the blood supply to the shoulder?
- Anterior and Posterior Circumflex Humeral Arteries
- Axillary Artery
- Brachial Artery
Where is the Circulatory Anastomosis of the Scapula?
Between the 1st part of the Subclavian artery and the 3rd part of the Axillary Artery