Term
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Definition
-supplied by spinal accessory nerve and ventral rami of spinal nerve C3 and C4
-originates from ligamentum nuchae and spinous processes C7-T12
-inserts on the scapula spine, acromion, and lateral third of clavicle
-extend head, elevate, retract, upwardly rotate, or depress pectoral gifdle |
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Term
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Definition
-supplied by thoracodorsal nerve
-originates from spinous processes T6 and lower
-inserts on floor of intertubercular groove of humerus
-extend, adducts, and medially rotates arm |
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Term
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Definition
-supplied by dorsal scapular nerve
-from spinous processed C7-T5 to medial border of scapula
-retract and downwardly rotates scapula |
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Term
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Definition
-innervated by the dorsal scapular nerve
-attaches superior angle of scapula and transverse processes of high cervical vertebrae
-elevate and downwardly rotates scapula |
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Term
| Serratus Posterior Superior |
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Definition
-deep to rhomboid and fibers are oriented in same direction
-supplied by branches of the intercostal nerves
-weakly elevates the upper ribs |
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Term
| Serratus posterior inferior |
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Definition
-supplied by branches of intercostal nerves
-deep to latissimus dorsi and attaches to lower ribs
-Depresses lower ribs |
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Term
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Definition
-originates from inferior half of ligamentum nuchae and spinous processes of C and upper T vertebrae
-insert at mastoid process and adjacent part of occipital bone |
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Term
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Definition
-originates from inferior half of ligamentum nuchae and spinous processes of C and upper T vertebrae
-inserts on transverse processes of upper C vertebrae |
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Term
| Sacrospinalis (erector spinae) |
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Definition
-iliocostalis: lateral column (prominent in lumbar region)
-longissimus: intermediate column (extends to skull)
-spinalis: medial column |
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Term
| Transversospinalis group (deeper intrinsic back muscles) |
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Definition
-Semispinalis capitis, cervicis, and thoracis, multifidus, rotatores
-together they extend the spine
-alone they rotate the spine or head toward opposite (contralateral) side |
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Term
| Semispinalis capitis, cervicis and thoracis |
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Definition
-originate on upper half of spine
-holds head up |
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Term
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Definition
| -fibers span 3 segments (caudally, multifidi attach at mammillary processes, and cranially attach at spinous processes |
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Term
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Definition
-cross 1 or 2 interspaces
-stabilize spine |
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Term
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Definition
-not true back muscles
-12
-elevate rib
-more lateral that rotatores |
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