Intrinsic Back Muscles Flashcards

1
Q

Splenius origin

A

arises from nuchal ligament and spinous processes of C7-T6 vertebrae

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2
Q

splenius capitis insertion

A

fibers run superolaterally to mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone

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3
Q

splenius cervicis insertion

A

tubercles of transverse processes of C1-C3 or C4 vertebrae

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4
Q

splenius innervation

A

posterior rami of spinal nerves

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5
Q

splenius action

A

acting alone: laterally flex neck and rotate head to side of active muscles
acting together: extend head and neck

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6
Q

superficial layer of intrinsic back muscles

A

splenius capitis and splenius cervicis

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7
Q

intermediate layer of intrinsic back muscles (erector spinae)

A

iliocostalis, longissimus, spinalis

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8
Q

Iliocostalis origin

A

arises by broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinous processes and supraspinous ligament

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9
Q

longissimus origin

A

arises by broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinous processes and supraspinous ligament

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10
Q

spinalis origin

A

arises by broad tendon from posterior part of iliac crest, posterior surface of sacrum, sacro-iliac ligaments, sacral and inferior lumbar spinous processes and supraspinous ligament

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11
Q

iliocostalis insertion

A

fibers run superiorly to angles of lower ribs and cervical transverse processes

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12
Q

iliocostalis made up of

A

lumborum, thoracis, and cervicis

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13
Q

longissimus insertion

A

fibers run superiorly to ribs between tubercles and angles to transverse processes in thoracic and cervical regions and to mastoid process of temporal bone

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14
Q

longissimus made up of

A

thoracis, cervicis and capitis

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15
Q

spinalis insertion

A

fibers run superioly to spinous processes in upper thoracic region and to cranium

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16
Q

spinalis made up of

A

thoracis, cervicis, and capitis

17
Q

iliocostalis innervation

A

posterior rami of spinal nerves

18
Q

longissimus innervation

A

posterior rami of spinal nerves

19
Q

spinalis innervation

A

posterior rami of spinal nerves

20
Q

iliocostalis, longissimus, spinalis action

A

acting bilaterally: extend vertebral column and head, as back is flexed, control movement by gradually lengthening their fibers
acting unilaterally: laterally flex vertebral columns

21
Q

deep layer of intrinsic back muscles (transversospinales)

A

semispinalis (thoracis, cervicis, and capitis)
multifidus
rotatores (brevis and longus)

22
Q

semispinalis origin

A

arises from transverse processes of C4- T10 vertebrae

23
Q

semispinalis insertion

A

fibers run superomedially to occipital bone and spinous processes in upper thoracic and cervical regions, spanning four to six segments

24
Q

semispinalis innervation

A

posterior rami of spinal nerves

25
Q

semispinalis action

A

extends head and thoracic and cervical regions of vertebral column and rotate them contralaterally

26
Q

multifidus origin

A

arises from posterior sacrum, posterior superior iliac spine of ilium, aponeurosis of erector spinae, sacro-iliac ligaments, mammillary processes of lumbar vertebrae, transverse processes of thoracic vertebrae, and articular processes of C4-C7

27
Q

multifidus insertion

A

thickest in lumbar region, fibers pass obliquely superomedially to entire length of spinous processes of vertebrae located two to four segments superior to origin

28
Q

multifidus innervation

A

posterior rami of spinal nerves

29
Q

multifidus action

A

unilateral contraction rotates to contralateral side. stabilizes vertebrae during local movements of vertebral column

30
Q

rotatores origin

A

arise from transverse processes of vertebrae, are best developed in thoracic region

31
Q

rotatores insertion

A

fibers pass superomedially to attach to junction of lamina and transverse process or spinous process of vertebra immediately (brevis) or two segments (longus) superior to vertebra of origin

32
Q

rotatores innervation

A

posterior rami of spinal nerves

33
Q

rotatores action

A

may function as organs of proprioception, possibly stabilize vertebrae and assist with local extensor and rotatory movements of vertebral column