O & I: Neck & Thorax Muscles

Question 1

Origin: Serratus Posterior superior

Answer 1

Nuchal Ligament, spinous processes of C7-T3

Question 2

Insertion: Serratus Posterior Superior

Answer 2

Superior borders of ribs 2 - 5 lateral to their angles

Question 3

Innervation: Serratus Posterior Superior

Answer 3

2nd - 5th intercostal nerves (anterior rami)

Question 4

Action: Serratus Posterior Superior

Answer 4

proprioception (elevate ribs)

Question 5

Origin: Serratus Posterior Inferior

Answer 5

spinous processes of T11 - L2 vertebrae

Question 6

Insertion: Serratus Posterior Inferior

Answer 6

inferior borders of ribs 9 - 12 lateral to their angles

Question 7

Innervation: Serratus Posterior Inferior

Answer 7

anterior rami to T9 - T12 thoracic spinal nerves

Question 8

Action: Serratus Posterior Inferior

Answer 8

proprioception (depress ribs)

Question 9

Origin: Levator Costarum

Answer 9

Transverse processes of C7 - T11

Question 10

Insertion: Levator Costarum

Answer 10

subjacent ribs between tubercle and angle

Question 11

Innervation: Levator Costarum

Answer 11

posterior primary rami of C8 - T11 nerves

Question 12

Action: Levator Costarum

Answer 12

elevate ribs

Question 13

Origin: External Intercostal

Answer 13

inferior border of ribs

Question 14

Insertion: External Intercostal

Answer 14

Superior border of ribs below

Question 15

Innervation: External Intercostal

Answer 15

intercostal nerve (T1- T11)

Question 16

Action: External Intercostal

Answer 16

Elevate ribs during forced inspiration

Question 17

Origin: Internal Intercostal & Innermost Intercostal

Answer 17

inferior border of ribs

Question 18

Insertion: Internal Intercostal & Innermost Intercostal

Answer 18

Superior border of ribs below

Question 19

Innervation: Internal Intercostal & Innermost Intercostal

Answer 19

intercostal nerve (T1- T11)

Question 20

Action: Internal Intercostal & Innermost Intercostal

Answer 20

During active (forced) respiration Interosseous part: depresses ribs

Intercondral part: elevates ribs

Question 21

Origin: Subcostal

Answer 21

Internal surface of lower ribs near their angles

Question 22

Insertion: Subcostal

Answer 22

superior borders of 2nd or 3rd ribs below

Question 23

Innervation: Subcostal

Answer 23

intercostal nerve (T1- T11)

Question 24

Action: Subcostal

Answer 24

Depresses ribs

probably act in same mannar intercostal muscles?

Question 25

Origin: Transversus Thoracis

Answer 25

posterior surface of lower sternum

Question 26

Insertion: Transversus Thoracis

Answer 26

internal surface of costal cartilages 2-6

Question 27

Innervation: Transversus Thoracis

Answer 27

intercostal nerve (T1- T11)

Question 28

Action: Transversus Thoracis

Answer 28

weekly depress ribs proprioception?

Question 29

Origin: Sternocleidomastoid (SCM)

Answer 29

lateral surfcae of mastoid process of temporal bone and lateral half of superior nuchal line

Question 30

Insertion: Sternocleidomastoid (SCM)

Answer 30

Sternal head: anterior surface of manubrium of sternum

Clavicular Head: superior surface of medial third of clavicle

Question 31

Innervation: Sternocleidomastoid (SCM)

Answer 31

Spinal Accessory nerve (CN XI; motor) & C2 and C3 nerves (pain and proprioception)

Question 32

Action: Sternocleidomastoid (SCM)

Answer 32

Unilateral Contraction: tilts head to same side (lateral flexion) and rotates it so face is turned superiorly toward opposite (contralateral) side

Bilateral contraction: (1) extends neck at atlantooccipital joints, (2) flexes cervical vertebrae so that chin approaches manubrium, or (3) extends superior cervical certebrae while flexing inferior vertebrae so chin is thrust forward with head kept level

W/ cervical certebrae fixed, may elevate manubrium and medial ends of clavicles, assisting pumphandle action of deep respiration

Question 33

Origin: Diaphragm

Answer 33

Thoracic outlet

Question 34

Insertion: Diaphragm

Answer 34

central tendon of diaphragm

Question 35

Innervation: Diaphragm

Answer 35

phrenic nerve (C3- C5)

Question 36

Action: Diaphragm

Answer 36

compresses abdominal cavity by decreasing pressure in thoracic cage so air can go into lungs

Question 37

Origin: Anterior Scalene

Answer 37

Transverse processes of C3- C6

Question 38

Insertion: Anterior Scalene

Answer 38

1st rib

Question 39

Innervation: Anterior Scalene

Answer 39

cervical spinal nerves C4-C6

Question 40

Action: Anterior Scalene

Answer 40

Flex Head

Question 41

Origin: Middle Scalene

Answer 41

posterior tubercles of transverse processes of C5 - C7 vertebrae

Question 42

Insertion: Middle Scalene

Answer 42

superior surface of 1st rib; posterior to groove for subclavain artery

Question 43

Innervation: Middle Scalene

Answer 43

anterior rami of cervical spinal nerves

Question 44

Action: Middle Scalene

Answer 44

flexes neck laterally ; elevates 1st rib during foced inspiration

Question 45

Origin: Posterior Scalene

Answer 45

posterior tubercles of transverse processes of C5 - C7 vertebrae

Question 46

Insertion: Posterior Scalene

Answer 46

external border of 2nd rib

Question 47

Innervation: Posterior Scalene

Answer 47

anterior rami of cervical apinal nerves C7 & C8

Question 48

Action: Posterior Scalene

Answer 48

flexs neck laterally ;elevates 2nd rib during forced inspiration

Question 49

Origin: Levator Scapulae

Answer 49

posterior tubercles of transverse processes of C2 - C6 vertebrae

Question 50

Insertion: Levator Scapulae

Answer 50

superior part of medial border of scapula

Question 51

Innervation: Levator Scapulae

Answer 51

dorsal scapular nerve C5 and cervical spinal nerves C3 and C4

Question 52

Action: Levator Scapulae

Answer 52

downward rotation of scapula and tilits its glenoid cavity inferiorly by rotating scapula