Ch 9- bony landmarks and muscles of shoulder girdle

Question 1

what muscle is highlighted and what is the line of pull?

Answer 1

serratus anterior; horizontal pull outward

Question 2

what bony landmark is highlighted?

Answer 2

acromion process: broad, flat area of superior lateral aspect, providing attachment for the upper trapezius muscle

Question 3

what bony landmark is highlighted?

Answer 3

manubrium: the superior end, providing attachment for the clavicle and first rib

Question 4

what is the green portion highlighted?

Answer 4

costoclavicular ligament: short, flat, rhomboid-shaped that connects the clavicle’s inferior surface to the superior surface of the costal cartilage of the first rib; limits clavicular elevation

Question 5

what bony landmark is highlighted?

Answer 5

coracoid process: projection on anterior surface, providing attachment for the pectoralis minor muscle

Question 6

What muscle is highlighted and what is the line of pull?

Answer 6

pectoralis minor; downward, vertical line of pull

Question 7

what bony landmark is highlighted?

Answer 7

body of clavicle: area between the two ends

Question 8

what is the letter B representing?

Answer 8

acromioclavicular ligament: supports the joint by holding the acromion process to clavicle to help prevent dislocation; superior and inferior

Question 9

what bony landmark is highlighted?

Answer 9

acromial end: attaches laterally to scapula and provides attachment for the upper trapezius muscle

Question 10

what bony landmark is highlighted?

Answer 10

body: middle 2/3rds of the sternum, providing attachment for remaining ribs

Question 11

What bony landmark is highlighted?

Answer 11

glenoid fossa: slightly concave surface that articulates with humerus on superior lateral side above the axillary border and below the acromion process; positioned in an anterior, lateral, and upward direction

Question 12

what bony landmark is highlighted?

Answer 12

sternal end of clavicle: attaches medially to sternum

Question 13

what bony landmark is highlighted

Answer 13

axillary border: lateral side between glenoid fossa and inferior angle

Question 14

what bony landmark is highlighted?

Answer 14

superior angle: superior medial aspect, providing attachement for levator scapula muscle

Question 15

what bony landmark is highlighted?

Answer 15

xiphoid process: “sword shaped”; inferior tip

Question 16

what bony landmark is highlighted?

Answer 16

inferior angle: most inferior point and where vertebral and axillary border meet; determines scapular rotation

Question 17

What is the muscle highlighted?

Answer 17

yellow: upper trapezius
blue: middle trapezius
red: lower trapezius

Question 18

name the scapular motions

Answer 18

1. elevation
2. depression
3. retraction (adduction)
4. protraction (abduction)
5. downward rotation
6. upward rotation

Question 19

What is the yellow portion highlighted?

Answer 19

interclavicular ligament: located on top of manubrium, connecting the superior sternal ends of clavicle and limit clavicular depression

Question 20

What’s the muscle and line of pull?

Answer 20

levator scapula; vertical line of pull

Question 21

What bony landmark is highlighted?

Answer 21

spine: projection on posterior surface, runing from medial border laterally to the acromion process; provides attachment for middle and lower trapezius muscles

Question 22

what joint is shown?

Answer 22

acromioclavicular joint

Question 23

what ligament is highlighted?

Answer 23

coracoacromial ligament: accessory ligament forming a roof over the head of humerus and serves as protective arch, providing support to head when an upward force is transmitted along the humerus; attaches laterally on the superior surface of the coracoid process and runs up and out to the inferior surface of the acromion process

Question 24

what bony landmark is highlighted?

Answer 24

vertebral border: between the superior and inferior angle medially, and attachment of the rhomboid and serratus anterior muscles

Question 25

What is A and C representing?

Answer 25

Coracoclavicular ligament: A(conoid) and C(trapezoid); accessory ligament providing stability to joint and allows scapula to be suspended from clavicle; connects the scapula to the clavicle by attaching to inferior surface of clavicle’s lateral end and to superior surface of scapula’s coracoid process

Question 26

What muscle is shown and what line of pull?

Answer 26

rhomboid muscle; horizontal line of pull outward

Question 27

what is the red portion highlighted?

Answer 27

sternoclavicular ligament: connects the clavicle to sternum on both anterior and posterior surface; anterior limits posterior motion and posterior limits anterior motion

Question 28

what joint is shown?

Answer 28

sternoclavicularjoint: articulation between the manubrium of the sternum and the medial (sternal) end of clavicle