Shoulder

Arthrology: AC Joint

Acromioclavicular Joint (AC): Irregular plane- type synovial joint "Irregular"... Why? Small amount of motion in all 3 planes of motion

produce horizontal adduction of the shoulder (glenohumeral joint)?

Coracobrachialis Anterior (clavicular) deltoid Pectoralis major

An individual reports a long-standing injury to the Axillary Nerve. Where do you expect to see weakness and atrophy?

Deltoid / deltoid region

Based on the lecture material related to direction-specific biases of rotator cuff activity, during which of the following activities would you expect the highest excitation of subscapularis relative to the other rotator cuff muscles?

Dumbbell row

Identify the best (most comprehensive) stretch for the anterior (clavicular) head of the deltoid:

Glenohumeral extension, external rotation, and abduction

Shoulder Girdle

Includes 3 bones: Scapula Clavicle Includes 2 true joints: Acromioclavicular (Distal) Sternoclavicular (Proximal) Includes 1 soft tissue articulation: Scapulo-thoracic "Joint"

The proximal attachment of the Rhomboid major are __________ to the proximal attachment of the Rhomboid minor.

Inferior

Which of the following muscles is expected to display significantly greater activity during external rotation than during internal rotation:

Infraspinatus

muscles attach to the greater tubercle of the humerus,

Infraspinatus Teres minor supraspinatus

Antagonists of Scapular Depression:

Levator scapula, Rhomboids (major and minor), Upper Trapezius

agonist of shoulder (glenohumeral) abduction:

Middle (acromial) deltoid

Name two muscles that produce extension, adduction, and medial rotation at the glenohumeral joint:

Name two muscles that produce extension, adduction, and medial rotation at the glenohumeral joint:

Name the muscle with attachments at the spine of the scapula and the deltoid tuberosity.

Posterior (spinal) deltoid

Posterior Cuff Muscles

S.I.T.

The Rotator Cuff

S.I.T.S. Supraspinatus Infraspinatus Teres Minor Subscapularis

Concentric contraction of the Infraspinatus and Teres Minor causes all of the following osteokinematic actions except:

Scapular Retraction

attachment at the costal surface of the scapula?

Serratus Anterior

innervated by the same peripheral nerve?

Supraspinatus and Infraspinatus

When the rotator cuff muscles serve to prevent or minimize undesirable glenohumeral joint motion or dislocation, the rotator cuff muscles are acting as:

True Synergists

During the first 90 degrees of abduction of the glenohumeral joint, the supraspinatus is the prime-mover. The acromial deltoid demonstrates increasing activity during the second half of glenohumeral abduction. In this scenario, supraspinatus is considered a(n) ____________ of the first 90 degrees of abduction.

agonist

Lowering a weight in the frontal plane requires eccentric supraspinatus contraction. This activity corresponds with which of the following osteokinematic movements?

glenohumeral adduction

The 'band pull-apart' exercise (resisted horizontal abduction) effectively trains which of the following muscles?

infraspinatus, teres minor, posterior (spinal) deltoid

An individual presents with a significant downwardly rotated scapula position. Muscular tightness (limited extensibility) is a contributing factor. Which of the following muscles are most likely to be tight?

minor and Rhomboids (minor and major)

Anterior cuff muscle

subscapularis

antagonist to glenohumeral external rotation?

subscapularis