pectoral region learning objectives

Question 1

what is the attachment for pectoralis major? clavicular head

Answer 1

clavicle to lateral lip of intertubercular sulcus of humerus

Question 2

what is the attachment for pectoralis major? sternocostal head

Answer 2

sternum, costal cartilage, and aponeurosis of external oblique to the lateral lip of intertubercualr sulcus

Question 3

what is the action of the pectoralis major?

Answer 3

humeral adduction, flexion, medial rotation, and sternocostal portion assists with extension of flexed arm

Question 4

what is the innervation for pectoralis major

Answer 4

lateral pectoral nerve: clavicular head (C5-7)
medial pectoral nerve: sternocostal head (C8-T1)

Question 5

what is the attachment for pectoralis minor

Answer 5

outer surface of ribs 3-5 to the coracoid process

Question 6

what are the actions of pectoralis minor

Answer 6

anterior tilt of scapula, assists with depression of shoulder and forced inspiration

Question 7

what is the innervation for pectoralis minor

Answer 7

medial and lateral pectoral nerves (C5-T1)

Question 8

what are the attachments for serratus anterior

Answer 8

outer surface and superior border of ribs 1-10 to the costal surface of the medial border of the scapula

Question 9

what is the action of serratus anterior

Answer 9

scapular protraction and upward rotation

Question 10

what is the innervation of serratus anterior

Answer 10

long thoracic nerve (C5-7)

Question 11

what is the attachment for subclavius

Answer 11

1st rib and cartilage to the undersurface of the clavicle

Question 12

what is the action of subclavius

Answer 12

depresses and stabilizes the clavicle

Question 13

what is the innervation for subclavius

Answer 13

subclavian nerve (C5-6)

Question 14

what are the joints of the shoulder girdle

Answer 14

1. sternoclavicular joint
2. acromioclavicular
3. scapulothoracic
4. glenohumeral

Question 15

what are the joint classification for the shoulder girdle joints

Answer 15

1. glenohumeral: ball +socket
2. sternoclavicular: saddle
3. acromioclavicular: plane gliding
4. scapulothoracic: pseudo joint

Question 16

what are the ligaments of the sternoclavicular joint

Answer 16

1. sternoclavicular ligament
2. costoclavicular ligament
3. interclavicular ligament

Question 17

what is the function of the sternoclavicular ligament

Answer 17

we have 2 both anterior and posterior which prevent the translation of the clavicle on the manubrium (also limit retraction and protraction of the scapula)

Question 18

what is the attachment of sternoclavicular ligament

Answer 18

manubrium to clavicle

Question 19

what is the attachment for costoclavicular ligament

Answer 19

from superior aspect of cartilage of first rib to undersurface of the clavicle

Question 20

what is the function of the costoclavicular ligament

Answer 20

stabilize sternoclavicular joint. limit elevation of the clavicle

Question 21

what is the attachment for acromioclavicular

Answer 21

from superior aspect of acromial end of the clavicle to the adjacent acromion

Question 22

what is the function of the interclavicular ligament

Answer 22

minimal restriction to depress clavicle

Question 23

what is the function of coracoclavicular ligament

Answer 23

prevent clavicle from moving superiorly

Question 24

what are components of a synovial joint?

Answer 24

• joint capsule
• articular cartilage along two ends of bone
• synovial membrane
  -synovial fluid

Question 25

what are the branches off thoracoacromial trunk ?

Answer 25

- pectoral - deltoid -clavicular - acromial