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Erector Spinae Muscles Spinalis Thoracis, Spinalis Cervicis and Spinalis Capitis: ORIGIN: Spines of...
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Transcript of Erector Spinae Muscles Spinalis Thoracis, Spinalis Cervicis and Spinalis Capitis: ORIGIN: Spines of...
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Erector Spinae Muscles
Spinalis Thoracis, Spinalis Cervicis and Spinalis Capitis:
ORIGIN: Spines of upper lumbar and lower thoracic vertebrae
INSERTION: Spines of upper thoracic and cervical vertebrae
ACTION: 1. Extends Vertebral Column
2. Assists in maintaining an erect spine
3. Assists in bending backwards, bending sideways & rotating the spine
to the same side
BLOOD SUPPLY: Muscular branch of the aorta
NERVOUS INNERVATIONS: Spinal nerves (dorsal rami)
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SPINALIS MUSCLES
Spinalis Cervicis
Spinalis Thoracis
Note: Spinalis Capitis NOT shown
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Spinalis Capitis
Spinalis Capitis
Spinalis
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SPINALIS MUSCLES
Spinalis Cervicis
Spinalis Cervicis
Spinalis Thoracis
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Transversospinal Muscles
Long Rotators and Short Rotators
ORIGIN: Transverse process of one vertebrae
INSERTION: Base of spinous process
- (Long Rotators): skips one vertebra to insert on the base of spinous process of vertebra above
- (Short Rotators): base of spinous process of vertebra immediately above.
ACTION: Rotate to opposite side & bilateral extension
BLOOD SUPPLY: Muscular branches of the aorta
NERVE SUPPLY: Dorsal Rami of spinal nerves
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LONG & SHORT ROTATORS
Rotators
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LONG & SHORT ROTATORS
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Transversospinal Muscles
Semispinalis Thoracis, Semispinalis Cervicis & Semispinalis Capitus
ORIGIN: Transverse processes of C7-T12
INSERTION: Occipital bone (capitis) and spinous processes of cervical (cervicis) and thoracic vertebrae T1 to T4 (thoracis)
ACTION: Extends vertebral column and head, and rotates them in opposite sides; acts synergistically with sternocleidomastoid muscle of opposite side.
BLOOD SUPPLY: Muscular branches of the aorta
NERVE SUPPLY: Spinal nerves (dorsal rami)
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CapitisCervicis
Thoracis
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SEMISPINALIS MUSCLES
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Capitis
Cervicis
Thoracis
Multifidus
CapitisCervicis
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SEMISPINALIS MUSCLES
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Transversospinal MusclesMultifidus
ORIGIN: 1. Cervical Region: from articular process of lower cervical vertebrae 2. Thoracic Region: from transverse process of all thoracic vertebrae 3. Lumbar Region: - lower portion of dorsal sacrum - deep surface of tendenous origin of erector spinae - mamillary processes of all lumbar vertebrae INSERTION: Spinous process of all vertebrae extending from L5-C2 (skipping 1-
3 segments)ACTION: Bilaterally extends vetebral column, controls lateral flexion to side
opposite contraction (eccentric for stability), and unilaterally rotate vertebral bodies (column) to opposite side
BLOOD SUPPLY: Muscular brances of aortaNERVE SUPPLY: Dorsal Rami of Spinal nerves
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Multifidus
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MULTIFIDUS
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MULTIFIDUS
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Segmental Muscles
Interspinalis
ORIGIN: Spinous processes of each vertebrae
INSERTION: The spinous process of the vertebra immediately above
ACTION: Extension of the vertebrae segments
BLOOD SUPPLY: Muscular branches of the aorta
NERVE SUPPLY: Dorsal Rami of spinal nerves
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INTERSPINALIS
Interspinalis
Interspinalis
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INTERSPINALIS