trunk extensors (back muscles)

Question 1

name the trunk extensors

Answer 1

Erector Spinae, Multifidus, Quadratus Lumborum

Question 2

what 3 muscle groups make up the erector spinae?

Answer 2

Iliocostalis: most lateral
Longissimus: the intermediate column
Spinalis: most medial

Question 3

what 3 muscles make up the iliocostalis muscles?

Answer 3

iliocostalis lumborum
iliocostalis thoracis
iliocostalis cervicis

Question 4

what 3 muscles make up the longissimus muscles?

Answer 4

longissimus thoracis
longissimus cervicis
longissimus capitis

Question 5

what 3 muscles make up the spinalis muscles?

Answer 5

spinalis thoracis
spinalis cervicis
spinalis capitis

Question 6

general erector spinae origin

Answer 6

spinous processes & supraspinous lig T11 to L5
post. sacral crest
post. iliac crest

Question 7

iliocostalis lumborum origin

Answer 7

spinous processes & supraspinous lig T11 to L5
post. sacral crest
post. iliac crest

Question 8

iliocostalis lumborum insertion

Answer 8

lower 6 ribs

Question 9

iliocostalis thoracis origin

Answer 9

lower 6 ribs

Question 10

iliocostalis thoracis insertion

Answer 10

upper 6 ribs

Question 11

iliocostalis cervicis origin

Answer 11

upper 6 ribs

Question 12

iliocostalis cervicis insertion

Answer 12

c4-c6 transverse processes

Question 13

iliocostalis muscles nerve supply

Answer 13

adjacent primary rami

Question 14

iliocostalis muscles actions

Answer 14

trunk ext, lat. flexion & rotation

Question 15

iliocostalis muscles functions

Answer 15

arch position (gymnastics)

Question 16

longissimus thoracis origin

Answer 16

lumbar transverse processes

Question 17

longissimus thoracis insertion

Answer 17

thoracic transvers processes & lower 10 ribs

Question 18

longissimus cervicis origin

Answer 18

T1-T6 transverse processes

Question 19

longissimus cervicis insertion

Answer 19

C2-C6 transvers processes

Question 20

longissimus capitis origin

Answer 20

T1-T5 transverse processes
C4-C7 articular processes

Question 21

longissimus capitis insertion

Answer 21

temporal bone mastoid process

Question 22

longissimus muscles nerve supply

Answer 22

adjacent primary rami

Question 23

longissimus muscles action

Answer 23

trunk ext, lat flexion & rotation

Question 24

longissimus muscles function

Answer 24

arch position (gymnastics)

Question 25

spinalis thoracis origin

Answer 25

T11-L2 spinous processes

Question 26

spinalis thoracis insertion

Answer 26

T1-T6 spinous processes

Question 27

why don’t spinalis cervicis or capitis have origins or insertions?

Answer 27

they are poorly developed so blend with adjacent muscles

Question 28

spinalis muscles nerve supply

Answer 28

adjacent primary rami

Question 29

spinalis muscles action

Answer 29

trunk extension, lat flexion & rotation

Question 30

spinalis muscles function

Answer 30

arch position (gymnastics)

Question 31

quadratus lumborum insertion

Answer 31

12th rib
transvers P’s of lumbar vertebrae

Question 32

quadratus lumborum origin

Answer 32

iliolumbar lig.
adjacent iliac crest

Question 33

quadratus lumborum nerve supply

Answer 33

anterior rami T12-L4

Question 34

quadratus lumborum action

Answer 34

trunk extension & lateral flexion

Question 35

quadratus lumborum function

Answer 35

arch position (gymnastics)

Question 36

Multifidus origin

Answer 36

sacrum
mamillary processes of lumbar vertebrae
thoracic transverse P’s
lower 4 / 5 cervical articular P’s

Question 37

Multifidus insertion

Answer 37

3 layer arrangement:
pass up & medially
Attach to spinous processes of all vertebrae from L5 - C2

Question 38

Multifidus nerve supply

Answer 38

adjacent primary rami

Question 39

Multifidus action

Answer 39

trunk extension, lat flexion & rotation

Question 40

Multifidus function

Answer 40

arch position (gymnastics)