Joints Of Upper Limb 475-481

Question 0

Scapulohumeral rhythm

Answer 0

For every 3 degrees of elevation, approximately 2 degrees occurs at the glenohumeral joint and 1 degree at the scapulothoracic.

Question 1

Movement at the pectoral girdle…(3 joints)

Answer 1

Involves the sternoclavicular, acromioclavicular, and glenohumeral joints, usually moving simultaneously.

Question 2

The sternoclavicular(sc) joint is a _____ _____ joint, but function as a _______ joint.

Answer 2

Synovial saddle joint but functions as a ballandsocket joint

Question 3

The articular disk of the sc joint serves as….

Answer 3

A shock absorber of forces transmitted from the upper limbs along the clavicle
The disk is firmly attached by an anterior and posterior ligaments, as well as an inter clavicular ligament

Question 4

The joint capsule of the sc joint

Answer 4

The fibrous layer of the capsule is attached to the margins of the articular surfaces

A synovial membrane lines internal surfaces of the fibrous layer of the capsule

Question 5

The interclavicular ligament strengthens ….

Answer 5

The joint capsule of the sc joint superiorly

Question 6

Costoclavicular ligament

Answer 6

Anchors the clavicle to the first rib and its costal cartilage, limiting elevation of the pectoral girdle

Question 7

Acromioclavicular (ac) joint

Answer 7

Is a plane synovial articulation

Question 8

The AC ligament

Answer 8

Fibrous band expending from the acromion to the clavicle, strengthening the ac joint superiorly

Most of the joint strength comes from the coracoidclavicular ligament

Question 9

coracoidclavicular ligament

Answer 9

Subdivided into conoid and trapezoid ligaments

In addition to augmenting the ac joint, the coracoclavicular ligament provides the means by which the scapula and free limbs are passively suspended from the clavicle

Question 10

Conoid ligament

Answer 10

Apex is Attached to the roof of the coracoid process and the base attachment is to the conoid tubercle on the inferior surface of the clavicle
P 478

Question 11

The nearly horizontal Trapezoid ligament

Answer 11

Is attached to the superior surface of the coracoid process and extends laterally and posteriorly to the trapezoid line on the inferior surface of the clavicle

Question 12

P.l.t.m.

Please listen to me

Answer 12

Pec lateral teres medial

Question 13

Coraco-acromial arch overlies the head of the humerus, preventing

Answer 13

its superior displacement from the glenoid cavity

Question 14

The glenohumeral joint is supplied by

Answer 14

The anterior and posterior circumflex arteries and branches of the suprascapular

Question 15

What are string fibrous thickenings of the joint capsule?

Answer 15

Collateral ligaments

Question 16

Oblique band

Answer 16

One of the ulnar collateral ligs

Deeps the trochlea

Question 17

Distal Ulnar collateral ligament

Answer 17

Attaches to ulnar styloid process and triquetrum

Question 18

Distal radial collateral ligament

Answer 18

Attaches to radial styloid process and scaphoid

Question 19

Mcp joint

Answer 19

Collateral ligs pass posterior to joint axis for flexion extension

Taut at 70-90 deg of flexion

When mcp joint in extension the ligs are relaxed. If immobilized for long time they will have a hard time flexing and making a fist

Question 20

Mcp joint blood supply

Answer 20

Deep digital arteries arising from superficial palmar arches

Question 21

Carpal joints ligaments

Answer 21

Carpal bones United by anterior , posterior, and interosseous ligaments