Lecture 9: shoulder osteology Final?

Question 1

what are the 4 mechanically interrelated articulations of the shoulder complex

Answer 1

sternum, clavicle, ribs, scapula, and shoulder

Question 2

characteristics of the shoulder complex

Answer 2

muscles work in teams

large versality = highly coordinated over multiple joints, large ROM

weakness/reduced activation in any components creates a global dysfunction for the shoulder girdle complex

Question 3

describe the landmarks of the sternum

Answer 3

many variations
costal facets for ribs
jugular notch
oval shaped clavicular facets

Question 4

describe the landmarks of the clavicle

Answer 4

shaft = curved (convex medially)

has a costal facet for the FC joint

costal tuberosity (attachment for costoclavicular ligament)

oval shaped acromial facet

conoid tubercle (attachment for conoid ligament) and trapezoid line (attachment for trapezoid ligament)

Question 5

where is the long axis of the clavicle

Answer 5

with the UE in anatomical position the long axis is slightly above the horizontal place, 20 degrees posterior to frontal

Question 6

the orientation of the clavicle is deviated how much from the frontal plane

Answer 6

20 degrees posterior

Question 7

the orientation of the scapular is deviated how far from the frontal plane

Answer 7

deviated 30-40 degrees anterior to the frontal plane

Question 8

scapula landmarks

Answer 8

inferior, superior, and lateral angles
medial, lateral, and superior border
root of spine
supra/infra fossa
spine
acromion
clavicular facet
glenoid fossa
supra/infra glenoid tubercles
coracoid process

sub scapular fossa

Question 9

landmarks of the proximal to mid humerus

Answer 9

nearly 1/2 sphere
head faces medially and superiorly
anatomic neck
lasser tubercle
greater tubercle (and upper, middle, and lower facets)
crests
inter tubercle groove
deltoid tuberosity
radial groove (separates triceps attachment; radial N spirals in and around radial groove)

Question 10

landmarks of the proximal to mid humerus

Answer 10

nearly 1/2 sphere
head faces medially and superiorly
anatomic neck
lasser tubercle
greater tubercle (and upper, middle, and lower facets)
crests
inter tubercle groove
deltoid tuberosity
radial groove (separates triceps attachment; radial N spirals in and around radial grooveinclin)

Question 11

inclination angle of the shoulder

Answer 11

135 degree inclination angle

Question 12

how is the humeral head rotated relative to the medial-lateral axis of the elbow

Answer 12

humeral head is rotated posteriorly about 30 degrees (retroversion)