types of joints

Question 1

radioulnar

Answer 1

pivot. 1 degree of freedom (pron/supin)

Question 2

radiocarpal

Answer 2

ellipsoid. 2 degrees of freedom (flex/ext, radial/ulnar deviation)

Question 3

humeroulnar

Answer 3

ginglymus jt. (hinge) (flexion/ext)

Question 4

humeroradial

Answer 4

capitellum of humerus, head of radius. atypical ball and socket joint

Question 5

glenohumeral

Answer 5

ball and socket jt. 3 degrees of freedom. (flex/ext, abd/add, horizontal abd/hor add). glenoid labrum= fibrocartilage that surrounds the periphery of the glenoid fossa, provides depth. In anatomical pos, Lig joint capsule is taut superiorly and loose anteriorly and inferiorly.

Question 6

sternoclavicular jt movements and ligaments

Answer 6

only bony articulation between shoulder girdle and trunk. elevation/depression, protraction/retraction, and rotation of clavicle permits movement of scapula. ant and post SC ligaments; costoclavicular ligaments (runs from first rib to clavicle, checks elevation); interclavicular lig (runs between clav’s, checks depression)

Question 7

acromioclavicular joint and motions possible

Answer 7

plane synovial joint connecting the acromian of the scap and the lateral end of the clavicle. allows additional scapula motion on the thorax during shoulder motion. scap rotation upward/down around anteroposterior axis, winging around vert axis, tipping around mediolateral axis. Fibrocartilage disk degenerates 4th decade of life. Jt capsule=weak, little stability, Sup and Inf AC ligs assist capsule to control horizontal displacement at the AC joint. Coracoclavic. lig= primary restraint preventing superior translation of clavicle on acromion

Question 8

roof of GH joint

Answer 8

Coracoid process, acromion process, coracoacromial lig.

Question 9

GH joint ligament functions

Answer 9

superior GH lig.=restrains anterior translation of humerus at 0 deg ABD.
Middle GH lig= restrains ant trans of hum at 45 deg abd
Inf GH lig complex=restrains ant trans at 90. includes Ant band, axillary pouch, post band.

Question 10

scapulothoracic ARTICULATION

Answer 10

not a true jt., fibrous connection of scap with thorax. elev/depression, retraction/protract., upward/downward rotation

Question 11

MCP joints and 1st MC w/ scaphoid

Answer 11

condyloid jt. 2 degrees of freedom. flex/ext,, abduction/adduction

Question 12

interphalangeal joints

Answer 12

uniaxial hinge joints. one degree of mvmt. (flex/ext