4 Intrinsic Muscles of Back Flashcards
Intrinsic Muscles of Back
Identify 1. O & I
- Semispinalis capitis muscle
Origin (Inferior Attachment): The semispinalis capitis muscle arises by a series of tendons from the transverse processes of the first 6 or 7 thoracic vertebrae and the lower cervical vertebra.
Insertion (Superior Attachment): This broad muscle inserts between the superior and inferior nuchal lines of the occipital bone.
Intrinsic Muscles of Back
Identify
- the erector spinae (the iliocostalis, longissimus, and spinalis muscles)
Intrinsic Muscles of Back
Identify 1. Action
- Semispinalis capitis muscle
Action: Extends the head and cervical spine, and rotates the head so that the face turns toward the opposite side.
Intrinsic Muscles of Back
Identify 1. Nerve
- Semispinalis capitis muscle
Innervation: Posterior rami of cervical spinal nerves.
Intrinsic Muscles of Back
List semispinalis muscles
The semispinalis muscles (capitis, cervicis, and thoracis components)
Intrinsic Muscles of Back
The semispinalis capitis muscle covers ____ (which muscle?)
the semispinalis cervicis muscle.
Intrinsic Muscles of Back
IThe semispinalis muscles (capitis, cervicis, and thoracis components) are part of ___ (muscle group?)
- the transversospinal muscle group
Intrinsic Muscles of Back
The semispinalis muscles (capitis, cervicis, and thoracis components) are part of the transversospinal muscle group
→ which is situated deep to the erector spinae and fills the concave region between ___ and ___
- the transverse and spinous processes of the vertebrae.
Intrinsic Muscles of Back
The erector spinae muscle comprises ____
- the iliocostalis, longissimus, and spinalis muscles.
Intrinsic Muscles of Back
The erector spinae muscle (the iliocostalis, longissimus, and spinalis muscles.)
→ Action?
Together, these muscles extend the vertebral column and head.
Unilaterally, they bend the vertebral column laterally.
Intrinsic Muscles of Back
The erector spinae muscle (the iliocostalis, longissimus, and spinalis muscles.)
→ Innervation?
Innervation: Posterior rami of the respective spinal nerves in each region.
Intrinsic Muscles of Back
Because of their locations, the iliocostalis muscles are classified into _____ (3 groups)
- lumborum, thoracis, and cervicis groups;
Intrinsic Muscles of Back
the longissimus muscles into ____ (3 groups)
thoracis, cervicis, and capitis groups
Intrinsic Muscles of Back
the longissimus muscles into ____ (3 groups)
thoracis, cervicis, and capitis groups.
Intrinsic Muscles of Back: Deep Layers
→ Identify 1
- Rotatores cervicis muscle (longus; brevis)
Intrinsic Muscles of Back: Deep Layers
→ Identify 2
- Rotatores thoracis muscle (longus; brevis)
Intrinsic Muscles of Back: Deep Layers
→ Identify 3
- Levatores costarum muscle (brevis; longus)
Intrinsic Muscles of Back: Deep Layers
→ Identify 4
4 Multifidus lumborum muscles
Intrinsic Muscles of Back: Deep Layers
→ Identify 5
5 Multifidus thoracis muscles
Intrinsic Muscles of Back: Deep Layers
→ Identify 6
6 Semispinalis thoracis muscle
Intrinsic Muscles of Back: Deep Layers
→ Identify 7
7 Semispinalis capitis muscle
Intrinsic Muscles of Back: Deep Layers
The transversospinal muscles include __
the semispinalis, multifidi, and rotatores.
Intrinsic Muscles of Back: Deep Layers
The transversospinal muscles include the semispinalis, multifidi, and rotatores.
→ Most of these muscles arise from____
the transverse processes of adjacent vertebrae
Intrinsic Muscles of Back: Deep Layers
The transversospinal muscles include the semispinalis, multifidi, and rotatores.
→ Most of these muscles arise from the transverse processes of adjacent vertebrae.
→ They pass superiorly to attach to ____ or ___
spinous or transverse processes of vertebrae above.
Intrinsic Muscles of Back: Deep Layers
The transversospinal muscles include the semispinalis, multifidi, and rotatores.
→ important for ___ (movements)
- stabilizing the vertebrae during movements of the vertebral column
- assist in extension and rotary movements of the vertebrae.
Intrinsic Muscles of Back: Deep Layers
The transversospinal muscles include the semispinalis, multifidi, and rotatores.
→ All are innervated by_____
posterior rami of the respective spinal nerves in each region.
