W7 - Shoulder Muscles & Rotator Cuffs Flashcards
Name proximal and distal attachment site for the pectoralis major muscle
Proximal
Clavicular head : anterior surface of the medial half of the clavicle
Sternocostal head : anterior surface, 1-7 ribs, sternal end 6th rib, aponeurosis of external oblique
Distal
lateral lip of the bicipital groove
What action does the clavicular head of the pectoralis major muscle do?
Flexion at the shoulder
What movement does the sternocostal head of the pectoralis major muscle do?
Extension of the shoulder from a flexed position
What movement do both the clavicular and sternocostal heads of the pectoralis major do together?
Adduction and medial rotation
What nerve applies the pectoral is major muscle?
Medial and lateral pectoral nerves C5-8, T1
How would you palpate the pectoralis major muscle?
Resist shoulder extension from a 60° flexion starting point
Resist adduction from an abducted started position
Anterior axilla then over the chest wall
The proximal and distal attachment sites for the latissimus Dorsi muscle of the shoulder
Proximal
- thoracolumbar fascia
- T7-12
- spinous processes lumbar/sacral vertebrae
- related spinous ligaments
- iliac crest
- lower 3-4 ribs
Distal
Middle (floor) of the bicipital groove
Name the nerve that supplies the LATISSIMUS DORSI muscle of the shoulder
Thoracodorsal nerve C6-8
What movements does the LATISSIMUS DORSI muscle of the shoulder do?
Shoulder extension
Shoulder medial rotation
Shoulder adduction
How would your palate be LATISSIMUS DORSI muscle of the shoulder
Ask your model to cough, this will show the posterior axiliary folds
Then feel for the muscle belly around the inferior angle of the scapular
By resisting shoulder extension at starting point of 90° shoulder flexion
By resistance shoulder adduction with a starting position of shoulder abduction
Name the proximal distal attachment size for the deltoid shoulder muscle
Proximal
Anterior border of the lateral third of the clavicle
Lateral margin of acromion
Spine of the scapula on the posterior surface
Distal
Delta tuberosity on midshaft of the humerus
What nerve applies the deltoid muscle of the shoulder?
Axiliary nerve C5-6
Name all the actions that the deltoid muscle provides for the shoulder
Shoulder abduction
Shoulder flexion
Shoulder medial rotation
Shoulder extension
Shoulder lateral rotation
Name the proximal and distal attachment sites for the coracobrachialis muscle of the shoulder
Proximal
Apex of the coracoid process
Distal
Medial aspect of the midshaft of the humerus
Name the nerve that supplies the coracobrachialis muscle of the shoulder
Musculocutaneous nerve C5 to 6
What movements does the coracobrachialis muscle of the shoulder do?
Shoulder adduction
Weak shoulder reflection
The proximal and distal attachment size for Teres major muscle of the shoulder
Proximal
Posterior surface of the inferior angle of the scapular
Distal
Medial lip of the bicep groove
What nerve supplies teres major muscle of the shoulder?
Inferior subscapular nerve C5 to 7
What movement does the teres major muscle of the shoulder do?
Shoulder adduction
Shoulder medial rotation
Assist extension from flexed position
Name the four rotator cuffs of the shoulder
Supraspinatus
Infraspinatus
Teres minor
Subscapularis
Name the proximal and distal attachment sites for the SUPRASPINATUS muscle of the rotator cuff
Proximal
Medial 2/3 of the supraspinous fossa
Distal
Superior facet on greater tubercle of humerus
Supplies the supraspinatus rotator cuff muscle of the shoulder
Suprascapular nerve C5 to 6
What action does the supraspinatus rotator cuff muscle do of the shoulder?
Stabilises glenohumeral joint
Assists in abduction of the shoulder
Name proximal and distal attachment sites for the infraspinatus rotator cuff muscle of the shoulder
Proximal
Medial 2/3 of the infraspinous fossa
Distal
Middle facet on greater tubercle of humerus
Name the nerve that supplies the infraspinatus rotator cuff muscle of the shoulder
Suprascapular nerve C5-6
What actions does the infraspinatus rotator cuff of the shoulder do?
Stabilises the glenohumeral joint
Lateral rotation of shoulder
The proximal and distal attachment sites for the Teres minor rotator cuff muscle
Proximal
Posterior surface , upper 2/3 of the lateral scapular
Distal
Inferior facet on greater tubercle of humorous
What nerve supplies the Teres minor rotator cuff muscle of the shoulder
Auxiliary nerve C5 to 6
What movements does the Teres minor rotator cuff muscle do?
Stabilises the glenohumeral joint
Lateral rotation of the shoulder
Name the proximal distal attachment size of the subscapularis rotator cuff muscle for the shoulder
Proximal
Medial 2/3 of the subscapular fossa
Distal
Lesser tubercle of humerus
What nerve supplies a subscapularis rotator cuff muscle of the shoulder?
Upper and lower sub scapula nerves C5 to 7
What movements does the subscapularis rotator cuff muscle do?
Stabilises the glenohumeral joint
Medial rotation of the shoulder
In the distal attachment sites for the bicep brachii muscle
Proximal
Long head : supraglenoid tubercle
Short head : coracoid process
Distal
Tuberosity of radius
Bicipital aponeurosis
What nerve supplies the biceps Brachii muscle?
Musculocutaneous nerve C5 to 6
What movement does the biceps brachii muscle do?
Flexion of the shoulder (long head)
Flexion of the elbow
Supination of the forearm
Name the proximal and distal attachment site for the triceps brachii muscle
Proximal
Long head : infraglenoid tubercle
Lateral head : upper part on the posterior surface of the humorous
Media head : lower parts on the posterior surface of the humorous
Distal
Posterior surface of olecranon process of the ulnar
What nerve supplies the triceps brachii muscle
Radial nerve C6 to 8
What movements does the tricep brachii muscle do?
Elbow extension
Adducts / extends shoulder (long head)
