Gross Anatomy I- Upper Extremity

Front 1

Origin of Pectoralis Major

Back 1

Clavicle (clavicular portion), Sternum and Upper Ribs (sternal-costal portion), Tendon of the External Oblique Muscle (abdominal portion)

Front 2

Insertion of Pectoralis Major

Back 2

Greater Tubercle (Lateral Lip of Inter-Tubercular Groove/Humerus)

Front 3

Action of Pectoralis Major

Back 3

(1) Adduction and Medial rotation of humerus (medial rotation against resistance). (2) Forced inspiration by elevating the rib cage when the humerous is fixed
CLAVICULAR PORTION: Flexes humerus at shoulder joint
STERNOCOSTAL PORTION: extends humerus at shoulder joint (when humerus is in a flexed position)

Front 4

Nerve Supply of Pectoralis Major

Back 4

Medial pectoral nerve (C8, T1), Lateral Pectoral nerve (C5, C6, C7)

Front 5

Origin of Pectoralis Minor

Back 5

Upper Ribs

Front 6

Insertion of Pectoralis Minor

Back 6

Coracoid process/Scapula

Front 7

Action of Pectoralis Minor

Back 7

(1) Involved w/protraction/abduction of the scapula (2) Elevates ribcage and thus involved w/forced inspiration

Front 8

Nerve Supply of Pectoralis Minor

Back 8

Medial pectoral nerve

Front 9

Origin of Subclavius

Back 9

First rib

Front 10

Insertion of subclavius

Back 10

Subclavian Groove/Clavicle

Front 11

Action of Subclavius

Back 11

(1)Moves clavicle medially (2)Acts as a protective cushion between clavicle and subclavian

Front 12

Nerve supply of subclavius

Back 12

(C5, C6)

Front 13

Origin of Trapezius

Back 13

(1) Superior nuchel line/occiput (2) External occiputal protuberance (3) Ligamentum Nuchae (4) Spines of the thoracic vertebrae

Front 14

Insertion of Trapezius

Back 14

(1) Clavicle (2) Acromion Process and Spine/scapula

Front 15

Action of Trapezius

Back 15

(1) Moves clavicle medially (2) Acts as a protective cushion between clavicle and subclavian vessels

Front 16

Nerve Supply of Trapezius

Back 16

(1) Spinal Accessory nerve (XI cranial) (2) Sensory (C4, C5)

Front 17

Origin of the Rhomboid Major

Back 17

Spine/upper thoracics

Front 18

Insertion of Rhomboid Major

Back 18

(1) Clavicle (2) Acromion Process and spine/scapula

Front 19

Action of Rhomboid Major

Back 19

(1) Elevate and adducts scapula (2) Helps stabilize scapula

Front 20

Nerve Supply of Rhomboid Major

Back 20

Dorsal Scapular Nerve (C5)

Front 21

Origin of Levator Scapula

Back 21

Transverse processes/upper cervical vertebrae

Front 22

Insertion of Levator Scapula

Back 22

Superior angle/scapula

Front 23

Action of Levator Scapula

Back 23

(1) Elevate scapula (2) Adducts scapula (3) Stabilize scapula

Front 24

Nerve Supply of Levator Scapula

Back 24

Dorsal Scapular Nerve (C5)

Front 25

Origin of Serratus Anterior

Back 25

Upper Ribs

Front 26

Insertion of Serratus Anterior

Back 26

Vertebral border/scapula

Front 27

Action of Serratus Anterior

Back 27

(1) Abduction/protraction of scapula (2) Stabilizes the scapula (3) Involved w/forced inspiration (only when humerus is abducted)

Front 28

Nerve Supply of Serratus Anterior

Back 28

Long Thoracic (C5, C6, C7)

Front 29

Origin of Deltoid

Back 29

(1) Anterior/clavicular portion from clavicle (2) Middle/acromial portion from the acromion process of scapula (3) Posterior/spinous portion

Front 30

Insertion of Deltoid

Back 30

Deltoid Tuberosity/humerus

Front 31

Action of Deltoid

Back 31

(1) Anterior portion: flexes and medially rotates arm (2) Middle portion:Abducts arm (3) Posterior portion: Extends and laterally rotates arm

Front 32

Nerve supply of Deltoid

Back 32

Axillary Nerve (C5, C6)

Front 33

Origin of Supraspinatus

Back 33

Supraspinous fossa/scapula

Front 34

Insertion of Supraspinatus

Back 34

Greater Tuberosity/humerus

Front 35

Action of Supraspinatus

Back 35

(1) Initiates abduction of arm (2) Helps laterally rotate humerus (3) Helps stabilize shoulder joint

Front 36

Nerve supply of Supraspinatus

Back 36

Suprascapular nerve (C5, C6)

Front 37

Origin of InfraSpinatus

Back 37

Infraspinous fossa/scapula

Front 38

Insertion of Infraspinatus

Back 38

Greater tuberosity/humerus

Front 39

Action of Infraspinatus

Back 39

(1) Laterally rotates humerus (2) Stabilizes shoulder joint

Front 40

Nerve Supply of Infraspinatus

Back 40

Suprascapular nerve (C5, C6)

Front 41

Origin of Subscapularis

Back 41

Subscapular fossa/scapula

Front 42

Insertion of Subscapularis

Back 42

Lesser Tuberosity/humerus

Front 43

Action of Subscapularis

Back 43

(1) Medially rotates humerus (2) Stabilizes shoulder joint

Front 44

Nerve supply of Subscapularis

Back 44

Subscapular nerve (C5, C6)

Front 45

Origin of Teres Major

Back 45

Inferior angle/scapula

Front 46

Insertion of Teres Major

Back 46

Medial lip of intertubercular groove (lesser tuberosity)

Front 47

Action of Teres Major

Back 47

(1) Adducts humerus (2) Stabilizes shoulder joint (3) Medially rotates humerus

Front 48

Nerve Supply of Teres Major

Back 48

Axillary nerve (C5, C6)

Front 49

Origin of Teres Major

Back 49

Axillary border/scapula

Front 50

Insertion of Teres Major

Back 50

Greater Tuberosity/humerus

Front 51

Action of Teres Minor

Back 51

(1) Laterally rotates humerus (2) Stabilizes shoulder joing

Front 52

Nerve Supply of Teres Minor

Back 52

Axillary nerve (C5, C6)

Front 53

Origin of Biceps Brachii

Back 53

Short Head: coracoid process
Long Head: supraglenoid tubercle/scapula

Front 54

Insertion of Biceps Brachii

Back 54

(1) Tuberosity/radius (2) Shaft/ulna

Front 55

Action of Biceps Brachii

Back 55

Flexion of forearm, supinates the radius (prime mover)

Front 56

Nerve supply of Biceps Brachii

Back 56

Musculocutaneous nerve (C5, C6)

Front 57

Origin of Coracobrachialis

Back 57

Coracoid process/scapula

Front 58

Insertion of Coracobrachialis

Back 58

Shaft/humerus

Front 59

Action of Coracobrachialis

Back 59

(1) Flexion and weak adduction of arm (shoulder joint) (2) Stabilizes shoulder joint

Front 60

Nerve Supply of Coracobrachialis

Back 60

Musculocutaneous nerve (C5, C6)

Front 61

Origin of brachialis

Back 61

Shaft/humerus

Front 62

Action of brachialis

Back 62

Flexes forearm (equal prome mover)

Front 63

Nerve Supply of Brachialis

Back 63

Musculocutaneous nerve (C5, C6)

Front 64

Origin of Triceps Brachii

Back 64

Long Head: infraglenoid tubercle/scapula
Lateral Head: shaft/humerus
Medial head: shaft/humerus

Front 65

Insertion of Triceps Brachii

Back 65

Olecranon process/ulna

Front 66

Action of Triceps Brachii

Back 66

Extension of forearm

Front 67

Nerve Supply of Triceps Brachii

Back 67

Radial nerve (C7, C8)