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39 Cards in this Set
- Front
- Back
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What are the 3 muscle groups of the back?
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superficial
intermediate deep |
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Superficial muscles?
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extrinsic muscles of the back (don't affect back directly)
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Role of Superficial muscles? 2
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produce and control limb movements
connect pectoral girdle to axial skeleton |
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Intermediate muscles?
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extrinsic muscles of the back
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Role of intermediate muscles?
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may produce respiratory movement
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Deep muscles of back?
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intrinsic muscles of the back
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Role of deep muscles? 3
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specifically act on vertebral column producing its movement and maintaining posture
assist of movement of head |
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Innervation of Superifical back muscles?
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nerved formed by ventral rami
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What are the 4 Superficial back muscles?
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trapezius
latissimus dorsi levator scapulae rhomboids |
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What are the 2 Intermediate back muscles?
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serratus posterior superior
serratus posterior inferior |
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Innervation of intermediate back muscles?
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intercostal nerves
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Innervation of deep muscles of back?
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dorsal rami of spinal nerves
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What are the 3 groups of the deep muscles of back?
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superficial intrinsic layer
intermediate intrinsic layer deep intrinsic layer |
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What does the spinal nerve divide into?
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dorsal and ventral rami
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What muscles are in the superficial intrinsic layer? 2
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splenius capitis
splenius cervicis |
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Action of splenius capitis and splenius cervicis?
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-both extend the head and nack if contracted bilaterally
-one side will pull the neck and head to the same side |
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Origin & insertion of splenius capitis?
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O- Lower half of ligamentum nuchae (C4 to C6) and spinous processes of C7 to T4
I- mastoid process |
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Origin & insertion of splenius cervicis?
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O-Spinous processes of T3 to T6
I- transverse process |
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Innervation of splenius capitis and splenius cervicis?
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Dorsal ramus: cervical region
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Ligamentum Nuchae?
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a fibrous sheet between the occipital bone and the 7th cervical vertebrae
-used for muscle attachment |
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What muscles are in the Intermediate intrinsic layer?
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erector spinae
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What 3 muscles are in the erector spinae?
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iliocostalis
longissimus spinalis |
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Role of Iliocostalis?
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-extends vertebral column when acting together
-bends vertebral column to same side if only one side contracts |
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Origin & insertion of Iliocostalis?
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O-Iliac crest
I- ribs |
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Action of Longissimus?
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-acting together extends vertebral column
-one side will bend the vertebral column to the same side -capitis portion will extend the head or unilaterally/ one side will turn face to same side |
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Origin & insertion Longissimus?
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O- Illiac crest
I- mastoid process |
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Action of Spinalis?
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extends vertebral column and head
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Origin & insertion Spinalis?
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O-spinous process
I- occipital bone |
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What muscles are in the deep intrinsic layer?
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transversospinal group
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Origin and Insertion of Transversospinal group?
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O-transverse process
I- spinous process |
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The 3 muscles in the Tranversospinal group?
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Semispinalis
multifidus rotatores |
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Spinalis?
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crosses 6 vertebrae
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Mutlifidus?
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crosses 4 vertebrae
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Rotatores?
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crosses 1 to 2 vertebrae
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Action of Tranversospinal group?
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rotate the body to the opposite side
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Quadratus Lumborum?
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is NOT a back muscle but forms part of the posterior abdominal wall
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Innervation of Quadratus Lumborum?
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ventral rami
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Action of Quadratus Lumborum?
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-both sides together will extend lumbar spine
-one side will bend to the same side |
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Origin & insertion of Quadratus Lumborum?
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O- iliac crest
I- ribs and tranverse process |
