Upper Extremity Muscles Origin and Insertion Flashcards Preview

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Flashcards in Upper Extremity Muscles Origin and Insertion Deck (27)
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1

Subscapularis
origin, insertion and action

o = suprascapular fossa
i = lesser tuberosity of humerus
a = internal rotation (Netter atlas says, internal rotation as well as adduction and extension of arm?)

2

Supraspinatus
origin, insertion and action

o = supraspinous fossa
i = greater tuberosity of humerus
a = abduction

3

Infraspinatus
origin, insertion and action

o = infraspinous fossa
i = greater tuberosity
a = external rotation of arm

4

Teres minor
origin, insertion, action and nerve

o = later border of scapula
i = greater tuberosity of humorous
a = external rotation (weak adduction?)
n = axillary (C5, C6)

5

Trapezius
origin, insertion and action

o = occipital bone (spinous process of C1-C7)
aponeurosis at T1-T4 spinous process
spinous process of T5-T12
i = clavicle
acromion
scapular spine
a = elevates, retracts and rotates scapula
depresses scapula
tilts head to same side
rotates head to opposite side
steadies scapula on thorax
glenoid cavity superiorly

6

Pectoralis minor
origin, insertion and action

o = ribs 3-5
i = coracoid process
a = lowers scapula laterally and medially
protracts scapula

7

What are the muscles of the rotator cuff?

Supraspinatus
Infraspinatus
Teres minor
Subscapularis

8

Serratus anterior
origin, insertion and action

o = ribs 1-9
i = medial border of scapula
a = protracts scapula
rotates scapula
fixes scapula to chest

9

Rhomboid minor
origin, insertion and action

o = spinous process of C6-C7
i = medial border of scapula above scapular spine
a = retraction
adduction

10

Rhomboid major
origin, insertion and action

o = spinous process of T1-T4
i = medial border of scapula below scapular spine
a = retraction
adduction

11

Levator scapulae
origin, insertion and action

o = transverse process of C1-C4
i = superior angle of scapula
a = elevates scapula
incline neck to same side

12

Teres major
origin, insertion and action

o = inferior angle of scapula
i = lesser tuberosity of humerus
a = extension
internal rotation
adduction

13

Latissimus dorsi
origin, insertion and action

o = inferior angle of scapula
ribs 9-12
illiac crest
spinous process T7-T12
i = lesser tuberosity of humerus
a = extension
adduction

14

Deltoid
origin, insertion, action and nerve

o = acromion
scapular spine
clavicle
i = deltoid tuberosity of humerus
a = abduction & adduction
flexion and extension
internal and external rotation
n = axillary (C5, C6)

15

Pectoralis major

o = clavicle
sternum (costal cartilages 1-6)
rectus sheath
i = greater tuberosity of humerus
a= adduction
internal rotation

16

Coracobrachialis
origin, insertion, action and nerve

o = coracoid process
i = humerus
a = flexion
n = musculocutaneous (C5, C6, C7)

17

Biceps
origin, insertion, action and nerve

o = supraglenoid tubercle of scapula
coracoid process
i = radial tuberosity
a = elbow joint: flexion, supination
shoulder joint: flexion,stabilization of humeral head, abduction and internal rotation of humerus
n = musculocutaneous (C5, C6, C7)

18

Brachialis
orgin, insertion, action and nerve

o = humerus
i = ulnar tuberosity
a = flexion
n = musculocutaneous (C5, C6, C7)

19

Brachioradialis
origin, insertion, action and nerve

o = distal humerus
i = styloid process of radius
a = flexion, pronation, supination
n = radial nerve (C5, C6)

20

Triceps
origin, insertion, action and nerve

o = infraglenoid tubercle of scapula
posterior humerus
i = olecranon of ulna
a = extension
n = radial (C5, C6)

21

Flexor carpi radialis
origin, insertion, action and nerve

o = medial epicondyle of humerus
i = base of 2nd and 3rd metacarpal
a = flexion
n = median (C5, C6)

22

Extensor carpi radialis longus
orgin, insertion, action and nerve

o = lateral supracondylar ridge of humerus
i = 2nd metacarpal
a = extension
n = radial (C5, C6)

23

Extensor carpi radialis brevis
orgin, insertion, action and nerve

o = lateral epicondyle of humerus
i = 3rd metacarpal
a = extension
n = radial (C7, C8)

24

Flexor carpi ulnaris
origin, insertion, action and nerve

o = medial epicondyle of humerus
i = pisiform
hamate
5th metacarpal
a = flexion
n = ulnar (C7-T1)

25

Extensor carpi ulnarus
origin, insertion, action and nerve

o = lateral epicondyle of humerus
i = 5th metacarpal
a = extension
n = radial (C7, C8)

26

Opponens pollicis
origin, insertion, action and nerve

o = trapezium
i = 1st metacarpal
a = opposition
n = median

27

What are the thenar muscles?

Thenar (means "palm of hand")

adductor pollicis
abductor pollicis brevis
flexor pollicis brevis
opponens pollicis