Pectoral Region

Question 1

Pectoralis Major AAIN

Answer 1

Attachments: clavicle, costal cartilages, sternum & aponeurosis of external oblique to the lateral lip of the intertubercular sulcus of humerus
Actions: Humeral adduction, flexion, medial rotation (sternocostal portion helps extend flexed arm)
Innervation: medial and lateral pectoral nerves
Nerve Roots: C5-6 and C7-T1

Question 2

Pectoralis Minor AAIN

Answer 2

Attachments: outer surfaces of ribs 3-5 to coracoid process
Actions: anterior tilt of scapula, assists with depression of shoulder and forced inspiration
Innervation: medial and lateral pectoral nerves
Nerve Roots: C5-T1

Question 3

Serratus Anterior AAIN

Answer 3

Attachments: outer surfaces and superior borders of upper 8-10 ribs to the costal surface of the medial border of scapula
Actions: scapular protraction, upward rotation
Innervation: long thoracic nerve
Nerve Roots: C5-7

Question 4

Subclavius AAIN

Answer 4

Attachments: 1st rib and cartilage to the undersurface of clavicle
Actions: depression & stabilization of clavicle
Innervation: subclavian nerve
Nerve Roots: C5-6

Question 5

Name the pectoral (shoulder) girdle joints.

Answer 5

Sternoclavicular, acromioclavicular, glenohumeral, scapulothoracic

Question 6

What is the synovial classification of the sternoclavicular joint?

Answer 6

Sellar/saddle

Question 7

What is the synovial classification of the acromioclavicular joint?

Answer 7

Plane/gliding

Question 8

What is the synovial classification of the glenohumeral joint?

Answer 8

Ball & socket

Question 9

What is the synovial classification of the scapulothoracic joint?

Answer 9

Pseudo-joint necessary for full glenohumeral function

Question 10

Function of coracoclavicular ligament?

Answer 10

Stabilizes acromioclavicular joint limiting medial displacement, protraction & elevation

Question 11

Attachments of coracoclavicular ligament?

Answer 11

Trapezoid- coracoid process to trapezoid line of clavicle

Conoid- coracoid process to conoid tubercle of clavicle

Question 12

Function of acromioclavicular ligament?

Answer 12

Stabilizes acromioclavicular joint

Question 13

Attachments of acromioclavicular ligament?

Answer 13

Superior aspect of acromial end of clavicle to adjacent acromion

Question 14

Function of coracoacromial ligament?

Answer 14

Prevents the superior displacement of the humeral head by forming the coracoacromial arch

Question 15

Attachments of coracoacromial ligament?

Answer 15

Lateral border of coracoid process to acromion adjacent to clavicular articulation

Question 16

Function of coracohumeral ligament?

Answer 16

Reinforces superoanterior aspects of joint capsule

Question 17

Attachments of coracohumeral ligament?

Answer 17

Base of coracoid process to anterior aspect of greater tubercle

Question 18

Function of costoclavicular ligament?

Answer 18

Stabilizes sternoclavicular joint, limiting elevation of the clavicle

Question 19

Attachments of costoclavicular ligament?

Answer 19

Superior aspect of cartilage of first rib to undersurface of the clavicle

Question 20

Function of superior transverse scapular ligament?

Answer 20

Closes off the suprascapular notch

Question 21

Attachments of superior transverse scapular ligament?

Answer 21

Base of the coracoid process to the medial edge of the scapular notch

Question 22

Attachments of glenoid capsule?

Answer 22

Circumference of glenoid cavity to anatomical neck of the humerus

Question 23

Function of glenohumeral ligaments (superior, middle, inferior)?

Answer 23

Stabilizes glenohumeral articulation

Question 24

Attachments of glenohumeral ligaments (superior, middle, inferior)?

Answer 24

Upper part of medial margin of glenoid cavity to lesser tubercle and anatomical neck