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Deep Muscles of the Back & Muscles of the Shoulder and Arm

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created 1 year ago by Kelsey_Parker
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updated 3 months ago by Kelsey_Parker

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1

What innervates the deep muscles of the back? (No exceptions?)

dorsal rami

deep muscles = erector spinae and some others

2

O I A INN of the coracobrachialis

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O coracoid process of the scapula

I medial surface of the middle of the humerus

A flexes arm, adducts arm; resists dislocation of shoulder

Inn musculocutaneous n. (C5-C7)

3

O I A Inn of triceps brachii?

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O Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus superior to radial groove

Medial Head: posterior surface of humerus inferior to radial groove

I olecranon process of ulna

A extends forearm - long head resists dislocation of the humerus and extends shoulder joint

Inn radial n (C6-C8)

4

What are the posterior muscles from the axial skeleton to the pectoral girdle?

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trapezius, levator scapulae, rhomboid major, rhomboid minor

5

O I A INN of trapezius

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O superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous process C7 and T1-T12 vertebrae

I lateral 1/3rd of the clavical, acromion, and spine of scapula

A Descending(upper) - Elevates scapula

Middle - Retracts scapula

•Ascending(lower) - Depresses scapula

Inn motor - accessory n (CN XI)

pain and proprioception - C3, C4 spinal nerves

6

Where is the superior nuchal line located?

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On the skull, just superior to the external occipital protuberance

7

What is the nuchal ligament?

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The nuchal ligament extends from the external occipital protuberance on the skull and median nuchal line to the spinous process of the seventh cervical vertebra in the lower part of the neck

8

O I A INN of levator scapulae

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O transverse process of C1-C4 vertebrae

I vertebral (medial) border of scapula near superior angle

A elevates scapula

INN dorsal scapular n

9
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O I A INN of trapezius

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O superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous process C7 and T1-T12 vertebrae

I lateral 1/3rd of the clavical, acromion, and spine of scapula

A Descending(upper) - Elevates scapula

Middle - Retracts scapula

•Ascending(lower) - Depresses scapula

Inn motor - accessory n (CN XI)

pain and proprioception - C3, C4 spinal nerves

10
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O I A INN of infraspinatus

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O infraspinous fossa of the scapula

I middle facet of greater tubercle of the humerus

A laterally rotates the arm/shoulder; helps hold humeral head in glenoid cavity

Inn suprascapular n (C4-C6)

11

What are the anterior muscles from the axial skeleton to pectroal girdle?

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serratus anterior and pectoralis minor

12

O I A INN of serratus anterior

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O lateral surface of ribs 1-8

I anterior surface of medial (vertebral) border of scapula

A protracts scapula, holds scapula against thoracic wall, and rotates scapula

Inn long thoracic n (C5-C7)

13

O I A INN of pectoralis minor

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O anterior surface of ribs 3-5

I corocoid process of scapula

A protracts scapula, elevates ribs when scapula is stationary to assist in inhalation

Inn medial pectoral n. (C8-T1)

14

What is the result of a paralyzed serratus anterior?

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"winging of the scapula"

scapula is not held to the thoracic wall

15

What muscles are from the axial skeleton to the humerus?

pectoralis major and latissimus dorsi

16

O I A Inn of pectoralis major?

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O clavicular head: anterior surface of medial half of clavicle

sternalcostal head: anterior surface of sternum superior six costal cartilages, aponeurosis of external oblique muscles

I lateral lip of intertubercular sulcus of humerus

A adducts arm, medially rotates arm. draws scapula anterior and inferior. acting alone, clavicular head flexes shoulder joint and sternocostal head extends it from flexed position.

Inn medial pectoral n (C8-T1) and lateral pectoral n (C5-C7)

17

Which muscle could be referred to as the "boxer's muscle" as it protacts the scapula and rotates the scapula?

serratus anterior

18

O I A Inn of triceps brachii?

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O Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus superior to radial groove

Medial Head: posterior surface of humerus inferior to radial groove

I olecranon process of ulna

A extends forearm - long head resists dislocation of the humerus

Inn radial n (C5-T1)

19

Which muscle could be called the handcuff muscle, as making the motion to be handcuffed required adduction of the arm, medial rotation of the arm, and extension of the arm?

latissimus dorsi

20

O I A INN of deltoid

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O lateral 1/3 of clavicle, acromion, and spine of scapula

I deltoid tuberosity of humerus

A anterior part: flexes arm and medially rotates arm

middle part: abducts arm

posterior part: extends and laterally rotates arm

Inn axillary n (C5-C6)

21

What are the rotator cuff muscles?

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subscapularis, supraspinatus, infraspinatus, and teres minor

22

O I A INN of subscapularis

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O subscapular fossa of scapula

I lesser tubercle of humerus

A medially rotates arms, adducts shoulder joint and holds humerus in glenoid cavity

INN upper subscapular n (C5) and lower subscapular n (C6)

23

O I A INN of supraspinatus

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O supraspinous fossa of the scapula

I superior facet og greater tubercle of the humerus

A abducts shoulder - initates before deltoid takes over

Inn suprascapular n (C4-C6)

24

O I A INN of infraspinatus

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O infraspinous fossa of the scapula

I middle facet of greater tubercle of the humerus

A laterally rotates the arm/shoulder; helps hold humeral head in glenoid cavity

Inn suprascapular n (C4-C6)

25

Which muscle initiates abduction (moves the arm for the first 15 degrees)

supraspinatus muscle

26

After the first fifteen degrees of abduction which muscle takes over from supraspinatus?

the deltoids

27

O I A INN of teres minor

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O lateral border of the scapula

I inferior facet of greater tubercle of the humerus

A laterally rotates the shoulder; helps hold humerus in glenoid cavity

Inn axillary n (C5-C6)

28

O I A INN of teres major

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dorsal surface of inferior angle of scapula

crest of lesser tubercle of humerus

Adducts arm, extends arm, medially rotates arm

lower subscapular n (C6)

29
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O I A INN of teres minor

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O lateral border of the scapula

I inferior facet of greater tubercle of the humerus

A laterally rotates the shoulder; helps hold humerus in glenoid cavity

Inn axillary n (C5-C6)

30

what are the muscles of the anterior compartment of the arm?

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coracobrachialis

biceps brachii (long head and short head)

brachialis

31

In the biceps brachii, which is more lateral, short or long head?

long head

32

O I A INN of biceps brachii

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O short head: corocoid process of scapula

long head: supraglenoid tubercle of scapula

I radial tuberosity and deep fascia of forearm via bicipetal aponeurosis

A flexes forearm when forearm is supinated, supinates forearm, and slight arm flexion. short head resists dislocation of shoulder.

Inn musculocutaneous n (C5-C7)

33

O I A INN of the coracobrachialis

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O coracoid process of the scapula

I medial surface of the middle of the humerus

A flexes arm, adducts arm; resists dislocation of shoulder

Inn musculocutaneous n.

34

O I A Inn of brachialis

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O distal half of anterior surface of humerus

I ulnar tuberosity and coranoid process

A flexes forearm in all positions

Inn musculocutaneous n (C5-C7)

35

Which muscle can flex the elbow joint whether the hand is pronated or supinated?

brachialis

36

O I A INN of subscapularis

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O subscapular fossa of scapula

I lesser tubercle of humerus

A medially rotates arms, adducts shoulder joint and holds humerus in glenoid cavity

INN upper subscapular n (C5) and lower subscapular n (C6)

37

O I A Inn of triceps brachii?

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O Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus superior to radial groove

Medial Head: posterior surface of humerus inferior to radial groove

I olecranon process of ulna

A extends forearm - long head resists dislocation of the humerus

Inn radial n

38

O of triceps brachii?

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O Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus superior to radial groove

Medial Head: posterior surface of humerus inferior to radial groove

39

During pronation and supination, which bone moves and which bone remains stationary?

radius moves. ulna remains stationary.

40

A muscle attaching to the ulna can flex forearm when hand is supinated, pronated, or both?

both - example is brachialis

41

O I A INN of subclavius m.

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O junction of first rib and its costal cartilage

I inferior surface of middle third of clavicle

A anchors and depresses clavicle

Inn subclavian n.

42

O I A INN of anconeous m

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O lateral epicondyle of humerus

I lateral surface of olecranon and superior part of posterior surface of ulna

A assists triceps in extending elbow joint and abducts ulna during pronation

Inn radial n (C5-T1)

43

Rhomboid minor O I A INN

O nuchal ligament spinous processes C7 and T1

I triangular area at the medial end of the scapular spine

A retract scapula and rotate it to depress glenoid cavity. fix scapula to thoracic wall

Inn dorsal scapular nerve (C4,C5)

44

Rhomboid major O I A INN

O spinous processes of T2-T5 vertebrae

I medial border of the scapula from the level of the spine to the inferior angle

A retract scapula and rotate it to depress the glenoid cavity; fix scapula to thoracic wall

45

latissimus dorsi O I A IN

O spinous processes of T6-T12, thoracolumba fascia, iliac crest, ribs 8 or 9 - 12

I floor of intertubercular sulcus of humerus

A extension, adduction, and medial rotation of humerus. raises body toward arms when climbing

In thoracodorsal n (C6-C8)


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