arthrology of the pectoral girdle

Question 1

what 2 bones form the pectoral girdle?

Answer 1

scapula and clavicle

Question 2

what bones articulate at the glenohumeral joint

Answer 2

scapula (glenoid fossa) and humerus

Question 3

what bones articulate at the acromioclavicular joint

Answer 3

scapula (acromion process) and clavicle

Question 4

how do you classify the sternoclavicular joint

Answer 4

synovial, saddle joint, functionally classed as ball and socket

Question 5

describe location of sternoclavicular joint

Answer 5

medial end of clavicle, superolateral part manubrium, adjacent part 1st rib

Question 6

describe the concave convex rule at the sternoclavicular joint

Answer 6

manubrium is concave superoinferiorly and convex in an AP direction

clavicle is

Question 7

functions of fibrocartilaginous disc

Answer 7

-splits the joint into 2 separate cavities, each lined with synovium
- improves congruency
- increased range of motion
- shock absorption

Question 8

what ligaments reinforce the fibrous capsule of sternoclavicular joint

Answer 8

anterior and posterior sternoclavicular ligs
interclavicular ligament

Question 9

attachments of anterior sternoclavicular ligament

Answer 9

-anterior aspect of SCJ
-upper anterior aspect of clavicle passing downward and medially to front of manubrium

Question 10

attachments of posterior sternoclavicular ligament

Answer 10

-posterior aspect of SCJ
-upper posterior part of clavicle to back of manubrium

Question 11

attachments of interclavicular ligament

Answer 11

upper part of each clavicle and upper part manubrium

Question 12

describe the costoclavicular ligament and its attachments

Answer 12

-short flat and strong
-attached above to inferior clavicle and below to upper medial part of 1st rib and costal cartilage
-2 separate lamina (bands)-anterior and posterior

Question 13

describe the movements available at the sternoclavicular joint

Answer 13

all movements are secondary to movements of the scapula
-elevation and depression -protraction and retraction
-axial rotation

Question 14

classify the acromioclavicular joint

Answer 14

synovial plane joint

Question 15

what are the 2 fibre types of the coracoclavicular ligament

Answer 15

conoid (vertical fibres) and trapezoid (oblique fibres)

Question 16

describe the conoid fibres of the coracoclavicular ligament

Answer 16

vertical fibres
from corocoid process, going upwards vertically to the conoid tubercle

Question 17

function of conoid fibres of coracoclavicular ligament

Answer 17

limit forward movement of the clavicle

Question 18

describe the trapezoid fibres of coracoclavicular ligament

Answer 18

oblique fibres
arise more anterolaterally on the coracoid process and pass obliquely
attaches to trapezoid line on clavicle

Question 19

function of trapezoid fibres of coracoclavicular ligament

Answer 19

limits backwards movement of the clavicle

Question 20

what movements occur at the acromioclavicular joint

Answer 20

small gliding and roatation movements associated with elevation, depression, protraction and retraction of the scapula