Back Origin/Insertions

Question 1

trapezius origin and insertion

Answer 1

origin- external occipital protuberance, spinous process of cervical to mid thoracic vertebra

insertion- clavicle, acromion, spine of scapula

Question 2

innervation and action of trapezius

Answer 2

innervation- anterior rami C3-C4, motor nerve (XI)

action- elevate, retract, depress scapula

Question 3

latissimus dorsi origin and insertion

Answer 3

origin- spinous process or mid thoracic to sacral (through thoracolumbar fascia), iliac crest

insertion- intertubercular sulcus (proximal humerus)

Question 4

innervation and action of latissimus dorsi

Answer 4

innervation- thoracadorsal nerve

action-adduct arm from an abducted position, extend arm form a flexed position

Question 5

origin and insertion of rhomboid major/minor

Answer 5

origin- spinous process of lower cervical to upper thoracic

insertion- medial border of scapula

Question 6

innervation and action of rhomboid major/minor

Answer 6

innervation- dorsal scapular nerve

action- retract scapula

Question 7

origin and insertion of levator scapulae

Answer 7

origin- transverse process of upper cervical

insertion- superior angle of scapulai

Question 8

innervation and action of levator scapulae

Answer 8

innervation- dorsal scapular

aciton- elevates scapula, fixes scapula (resist downward force), downward rotation

Question 9

origin and insertion of serratous posterior superior

Answer 9

origin- nuchal ligament, spinous process of C7-T3

insertion-n superior border of ribs 2-5

Question 10

innervation and action of serratous posterior superior

Answer 10

innervation- anterior rami T2-T5

action- elevates superior ribs

Question 11

origin and insertion of serratous posterior inferior

Answer 11

origin- spinous process of T11-L2

insertion- inferior border of ribs 9-12

Question 12

innervation and action of serratous posterior inferior

Answer 12

innervation- anterior rami T9-T12

action- depresses inferior ribs

Question 13

Origin and insertion of splenius capitits

Answer 13

origin- spinous process of cervical and upper thoracic vertebra

insertion- mastoid process and occipital bone

Question 14

innervation and action of splenius capitis

Answer 14

innervation- dorsal rami C2-C6

action- extend/laterally bends neck and head , rotates head to same side

Question 15

origin and insertion of splenius cervicis

Answer 15

origin- spinous process of cervical and upper thoracic vertebra

insertion- transverse process of upper cervical

Question 16

innervation and action of splenius cervicis

Answer 16

innervation- dorsal rami C2-C6

action- extend/laterally bends neck and head, rotates head to same side

Question 17

origin and insertion of iliocostalis

Answer 17

(most lateral of erector spinae)

origin-iliac crest, sacrum

insertion- lateral to costal angle

Question 18

innervation and action of iliocostalis

Answer 18

innervation - dorsal rami C4-S5

action- extends and laterally bends the trunk and neck

Question 19

origin and insertion of longissimus

Answer 19

origin- transverse process at inferior vertebral levels

insertion- medial to costal angle

Question 20

innervation and action of longissimus

Answer 20

innervation- dorsal rami of C1- S1

action- extends and laterally bends the trunk, neck, and head

Question 21

origin and insertion of spinalis

Answer 21

origin- spinous process at inferior vertebral levels

insertion- spinous process at superior vertebral levels

Question 22

innervation and action of spinalis

Answer 22

innervation- dorsal rami of C2- L3

action- extends and laterally bends trunk, neck

Question 23

origin and insertion of rotatores thoracis

Answer 23

origin- transverse process of thoracic

insertion- long: spinous process 2 levels above origin
brevis: spinous process one level above origini

Question 24

innervationa and action of rotatores thoracic

Answer 24

innervation- dorsal rami C1-L5

action- rotates vertebral column to opposite side

Question 25

origin and insertion of multifidus lomborum

Answer 25

origin- sacrum, transverse of C3-L5 insertion- spinous process of 2-4 vertebral levels superior to origin

Question 26

innervation and action of multifidus lomborum

Answer 26

innervation- dorsal rami of C1-L5 action- extend/laterally bends trunk, rotate to opposite side

Question 27

origin and insertion of semispinalis capitis

Answer 27

origin- articular processes of C4-C7, transverse processes of T1-T6 insertion- between superior and inferior nuchal lines of occipital bone

Question 28

innervation and action of semispinalis capitis

Answer 28

innervation- greater occipital nerve action- extension, lateral flexion, lateral rotation of neck

Question 29

origin and insertion of semispinalis cervicis

Answer 29

origin- transverse processes of T1-T6 insertion- posterior surfaces of spinous processes of C2-C5

Question 30

innervation and action of semispinalis cervicis

Answer 30

innervation- medial branches of posterior rami action- laterally flexes neck, rotates neck to opposite side

Question 31

origin and insertion of semispinalis thoarcis

Answer 31

origin- transverse processes of T6-T11 insertion- spinous process of C6-T4 vertebra

Question 32

innervation and action of semispinalis thoracis

Answer 32

innervation- medial branches of posterior rami of thoracic nerves action- extension, lateral flexion and rotation of thoracic spine

Question 33

origin and insertion of interspinalis

Answer 33

origin- superior aspect of spinous processes of C3-T1 insertion- inferior aspect of spinous processes of cranially adjacent vertebra C2-C7

Question 34

innervation and action of interspinalis

Answer 34

innervation- medial branches of posterior division of spinal nerves action- aid in extension of cervical spine and stabilize the cervical spine and maintain body posture

Question 35

origin and insertion of levatores costorum

Answer 35

origin- transverse process of C7-T11 insertion- rib one level below vertebra or origin

Question 36

innervation and action of levatores costarum

Answer 36

innervation- dorsal rami of C8-T11 action- elevates the ribs during respiration

Question 37

origin and insertion of intertranersarii

Answer 37

origin- transverse process of one cervical vertebra (or lumbar) insert- transverse process of adjacent vertebra

Question 38

innervation and action of intertransversarii

Answer 38

innervation- anterior rami of spinal nerves action- lateral flexion of vertebral column, stabilize the vertebral column

Question 39

origin and insertion of rectus capitis posterior minor

Answer 39

origin- posterior tubercle of C1 insertion- medial part of inferior nuchal line of occipital bone

Question 40

innervation and action of rectus capitis posterior minor

Answer 40

innervation- suboccipital nerve (posterior rami C1) action- extend head on neck

Question 41

origin and insertion of obliquus capitis superior

Answer 41

origin- transverse process of C1 insertion- occipital bone between superior inferior nuchal lines

Question 42

innervation and action of obliquus capitis superior

Answer 42

innervation- suboccipital nerce (post rami C1) action- contraction causes head extension at atlantoaxial joint

Question 43

origin and insertion of rectus capitis posterior major

Answer 43

origin- spinous process of C2 insertion- lateral part of inferior nuchal line of occipital bone

Question 44

innervation and action of rectus capitis posterior major

Answer 44

innervation- suboccipital nerve (C1 posterior rami) action- extension and rotation of head

Question 45

origin and insertion of obliquus capitis inferior

Answer 45

origin- lateral surface of spinous process of axis (C2) insertion- posterior aspect of transverse process of atlas (C1)

Question 46

innervation and action of obliquus capitis inferior

Answer 46

innervation- suboccipital nerce (posterior ramus C1) action- rotates head to side