Back Muscles (O, I, A, Ns)

Question 1

Origin: trapezius

Answer 1

Skull - external occipital protuberance

Fasica - ligamentum nuchae

Vertebrae - Spine of C7, T1-T12

Question 2

Insertion: trapezius

Answer 2

Clavicle - lateral 1/3

Scapula - acromion and spine

Question 3

Action: trapezius

Answer 3

Both elevates and depresses shoulder

Retracts scapula

Extends neck

Question 4

Nerve: trapezius

Answer 4

Accessory nerve (Cranial nerve XI)

Question 5

Origin: Latissimus Dorsi

Answer 5

Vertebra - spines of T6-T12

Fasica - thoracolumbar fascia

Pelvic bone - iliac crest

Question 6

Insertion: Latissimus Dorsi

Answer 6

Humerus - intertubercular groove

Question 7

Action: Latissimus Dorsi

Answer 7

Adducts, extends, and medially rotates arm

Question 8

Nerve: Latissimus Dorsi

Answer 8

Thoracodorsal N.

Question 9

Origin: Levator Scapulae

Answer 9

Vertebrae - transverse processes of C1 - C4

Question 10

Insertion: Levator Scapulae

Answer 10

Scapula - superior angle and medial border

Question 11

Action: Levator Scapulae

Answer 11

elevates and abducts scapula

Question 12

Nerve: Levator Scapulae

Answer 12

Dorsal Scapular nerve

Question 13

Origin: Rhomboid minor

Answer 13

Vertebrae - spines of C7, T1

Question 14

Insertion: Rhomboid minor

Answer 14

Scapula - medial border

Question 15

Action: Rhomboid minor

Answer 15

Elevates and abducts scapula

Question 16

Nerve: Rhomboid minor

Answer 16

Dorsal Scapular nerve

Question 17

Origin: Rhomboid major

Answer 17

Vertebra - spines of T2-T5

Question 18

Insertion: Rhomboid major

Answer 18

Scapula - medial border to inferior angle

Question 19

Action: Rhomboid major

Answer 19

Elevates and adducts scapula

Question 20

Nerve: Rhomboid major

Answer 20

Dorsal Scapular nerve

Question 21

Origin: Teres major

Answer 21

Dorsal surface of the inferior angle of the scapula

Question 22

Insertion: Teres major

Answer 22

Crest of the lesser tubercle of the humerus

Question 23

Action: Teres major

Answer 23

Internal rotation, adduction and extension of the arm

Question 24

Nerve innervation: Teres major

Answer 24

Axillary nerve (C5, C6)

Question 25

Origin: Teres minor

Answer 25

Upper two-thirds of the lateral margin of the scapula

Question 26

Insertion: Teres minor

Answer 26

Greater tubercle of the humerus

Question 27

Action: Teres minor

Answer 27

External rotation and adduction of the arm

Question 28

Nerve innervation: Teres minor

Answer 28

Lower subscapular nerve

Question 29

Origin: Levator Costarum

Answer 29

Vertebrae - process of C7, T1 - T11

Question 30

Insertion: Levator Costarum

Answer 30

Ribs - inferior to origin

Question 31

Action: Levator Costarum

Answer 31

Raises ribs in inspiration

Question 32

Nerve: Levator Costarum

Answer 32

Dorsal rami of thoracic spinal nerves

Question 33

Origin: Serratus posterior superior

Answer 33

Vertebrae - spines of the cervical and upper thoracic vertebrae

Question 34

Insertion: Serratus posterior superior

Answer 34

Ribs

Question 35

Action: Serratus posterior superior

Answer 35

Raises ribs in inspiration

Question 36

Nerve: Serratus posterior superior

Answer 36

Intercoastal nerves

Question 37

Origin: Serratus posterior inferior

Answer 37

Vertebrae - spines of upper lumbar and lower thoracic vertebrae

Question 38

Insertion: Serratus posterior inferior

Answer 38

Ribs

Question 39

Action: Serratus posterior inferior

Answer 39

Lowers ribs in exhalation

Question 40

Nerve: Serratus posterior inferior

Answer 40

Intercoastal nerves

Question 41

Origin: infraspinatus

Answer 41

Medial three quarters of infraspinous fossa of scapula and fibrous intermuscular septa

Question 42

Origin: supraspinatus

Answer 42

Medial three quarters of supraspinous fossa of scapula, upper surface of spine

Question 43

Insertion: Infraspinatus

Answer 43

Middle facet of greater tuberosity of humerus and capsule of shoulder joint

Question 44

Action: Infraspinatus

Answer 44

Laterally rotates arm and stabilizes shoulder joint

Question 45

Nerve: Infraspinatus

Answer 45

Suprascapular nerve (C5, 6 ) (from upper trunk)

Question 46

Action: Supraspinatus

Answer 46

Abducts arm and stabilizes shoulder jnt

Question 47

Insertion: Supraspinatus

Answer 47

Superior facet on greater tuberosity of humerus and capsule of shoulder joint

Question 48

Nerve: Supraspinatus

Answer 48

Suprascapular N (C5, 6)(from upper trunk)

Question 49

Origin: Splenius

Answer 49

Vertebra - spines of T1 - T4

Question 50

Insertion: Splenius

Answer 50

Splenius capitis to skull - occipital and temporal bones Splenius cervicis to vertebrae - transverse processes of C2 - C3

Question 51

Action: Splenius

Answer 51

Extend neck and head (rotate in unilateral action)

Question 52

Nerve: Splenius

Answer 52

Dorsal rami of spinal nerves

Question 53

Origin: Erector Spinae Iliocostalis

Answer 53

Sacrum, the illiac crest

Question 54

Insertion: lIiocostalis

Answer 54

lIiocostalis to ribs and transverse processes

Question 55

Action: IIiocostalis

Answer 55

Extend trunk and vertebral column

Question 56

Nerve: lIiocostalis

Answer 56

Dorsal rami of spinal nerves

Question 57

Origin: Longissimus

Answer 57

Logngissisum from transeverse process of vertebra

Question 58

Insertion: Longissimus

Answer 58

Longissimus to transvers process of vertebrae

Question 59

Action: Longissimus

Answer 59

Extend trunk and vertebral column

Question 60

Nerve: Longissimus

Answer 60

Dorsal rami of spinal nerves

Question 61

Origin: Spinalis

Answer 61

Spinalis from spinous process

Question 62

Insertion: Spinalis

Answer 62

Spinous processes six levels above

Question 63

Action: Spinalis

Answer 63

Extend trunk and vertebral column

Question 64

Nerve: Spinalis

Answer 64

Dorsal rami of spinal nerves