Dorsal Scapular Region

Question 1

Where are the proximal attachments of the DELTOID?

Answer 1

Clavicle, Acromion, Spine of scapula

Question 2

Where are the distal attachments of the DELTOID?

Answer 2

deltoid tuberosity of humerus

Question 3

What nerves innervate the deltoid?

Answer 3

Axillary nerve C5, C6

Question 4

What are the muscle actions of the DELTOID?

Answer 4

Clavicular part (anterior): arm flexion, arm IR
Acromial part (middle): arm abduction
Spinal part (posterior): arm extension, arm ER

Question 5

What are the purposeful activities of the DELTOID?

Answer 5

doing yoga poses with arms overhead (all fibers)

reaching for (anterior fibers) and putting on (posterior fibers) a seat belt

Question 6

What are the purposeful activities of the PECTORALIS MAJOR?

Answer 6

reaching across the body into an overhead cabinet, putting on a seatbelt

Question 7

What are the muscle actions of the PECTORALIS MAJOR?

Answer 7

Humerus ADDUCTION
Humerus IR

Scapular PROTRACTION
(draws scapula anteriorly and inferiorly)

Arm HORIZONTAL ADDUCTION

When acting alone:
Clavicula head: Humerus flexion
Sternocostal head: humerus extension from flexed position

Question 8

What are the proximal attachments of the PECTORALIS MAJOR?

Answer 8

Clavicular head: clavicle
Sternocostal head: sternum, costal cartilages 1-6, external oblique muscle

Question 9

What are the distal attachments of the PECTORALIS MAJOR?

Answer 9

lateral lip of intertubercular sulcus of humerus

Question 10

What nerves innervate the PECTORALIS MAJOR?

Answer 10

lateral and medial pectoral nerves; clavicular head (C5, C6), and sternocostal head (C7,C8,T1)

Question 11

What are the purposeful activities of the PECTORALIS MINOR?

Answer 11

Taking a deep breath, walking with crutches

Question 12

Where are the proximal attachments of the PECTORALIS MINOR?

Answer 12

Ribs 3-5 near their costal cartilages

Question 13

Where is the distal attachment of the PECTORALIS MINOR?

Answer 13

coracoid process

Question 14

What nerves innervate the PECTORALIS MINOR?

Answer 14

medial pectoral nerve (C8, T1); lateral pectoral nerve (variable)

Question 15

What are the muscle actions of the PECTORALIS MINOR?

Answer 15

Scapular PROTRACTION
(stabilization by drawing it inferiorly and anteriorly against thoracic wall)

With the scapula fixed…
Assists to ELEVATE the thorax during forced inhalation

Question 16

What are the 4 rotator cuff muscles?

Answer 16

Supraspinatus, infraspinatus, teres minor, subscapularis

Question 17

What is the purposeful activity of the infraspinatus?

Answer 17

playing racket sports or table tennis

Question 18

What is the proximal attachment of the INFRASPINATUS?

Answer 18

infraspinous fossa

Question 19

Where is the distal attachment of the INFRASPINATUS?

Answer 19

greater tubercle of humerus

Question 20

What are the muscle actions of the INFRASPINATUS?

Answer 20

Shoulder ER (GHJ)

Stabilize the head of the humerus in the glenoid cavity along with the other SITS muscles

Question 21

What nerve innervates the INFRASPINATUS?

Answer 21

suprascapular nerve (C5, C6)

Question 22

Who is “lats little brother”?

Answer 22

Teres Major

Question 23

What are the purposeful activities of the TERES MAJOR?

Answer 23

Toileting and perineal care

Question 24

What are the muscle actions of the TERES MAJOR?

Answer 24

Shoulder adduction
Shoulder IR (GHJ)

Question 25

Where are the proximal attachments of the TERES MAJOR?

Answer 25

posterior surface of inferior angle of the scapula

Question 26

Where are the distal attachments of the TERES MAJOR?

Answer 26

Medial lip of intertubercular sulcus of humerus

Question 27

What nerve innervates the TERES MAJOR?

Answer 27

Lower subscapular nerve (C5, C6)

Question 28

What are the purposeful activities of the SUPRASPINATUS?

Answer 28

painting overhead or washing your hair

Question 29

What are the muscle actions of the SUPRASPINATUS?

Answer 29

Initiates and assists deltoid in abduction of arm Stabilizes the head of humerus in glenoid cavity, along with the other SITS muscles

Question 30

Where are the proximal attachments of the SUPRASPINATUS?

Answer 30

supraspinous fossa

Question 31

Where is the distal attachment of the SUPRASPINATUS?

Answer 31

greater tubercle of humerus

Question 32

What nerves innervate the SUPRASPINATUS?

Answer 32

suprascapular nerve C4, C5, C6

Question 33

What are the purposeful activities of the TERES MINOR?

Answer 33

washing the back of head and neck

Question 34

What are the muscle actions of the TERES MINOR?

Answer 34

Shoulder ER (GHJ) Stabilize head of humerus in glenoid cavity

Question 35

Where is the proximal attachment of the TERES MINOR?

Answer 35

lateral border of the scapula

Question 36

Where is the distal attachment of the TERES MINOR?

Answer 36

greater tubercle of humerus

Question 37

What nerves innervate the TERES MINOR?

Answer 37

Axillary nerve (C5, C6)

Question 38

What are the purposeful activities of subscapularis?

Answer 38

toileting, donning a bra, or throwing a baseball

Question 39

What are the muscle actions of the SUBSCAPULARIS?

Answer 39

Shoulder IR Stabilizes the head of humerus in glenoid cavity

Question 40

Where is the proximal attachment of the subscapularis?

Answer 40

subscapular fossa

Question 41

Where is the distal attachment of the SUBSCAPULARIS?

Answer 41

lesser tubercle of humerus

Question 42

What nerves innervate the SUBSCAPULARIS?

Answer 42

upper and lower subscapular nerves C5, C6, C7

Question 43

What is the purposeful activity of the SERRATUS ANTERIOR?

Answer 43

pushing open a heavy door

Question 44

What are the muscle actions of the SERRATUS ANTERIOR?

Answer 44

Scapular protraction (ST joint) Scapular upward rotation Holds scapular against thoracic wall

Question 45

Where are the proximal attachments of the SERRATUS ANTERIOR?

Answer 45

lateral ribs 1-9

Question 46

Where is the distal attachment of the SERRATUS ANTERIOR?

Answer 46

medial border of scapular

Question 47

What nerve innervates the SERRATUS ANTERIOR?

Answer 47

long thoracic nerve (C5, C6, C7)