Intrinsic Back Flashcards
Serratus Posterior Superior O
nuchal ligament
spinous process C7-T3
Serratus Posterior Superior I
superior borders of 2-4 ribs
Serratus Posterior Superior Innervation
2nd-5th intercostal nerves
Serratus Posterior Superior Motion
elevate ribs
Serratus Posterior Inferior O
Spinous process of T11 - L2 vertebrae
Serratus Posterior Inferior I
Inferior borders of 8th - 12th ribs near their angles
Serratus Posterior Inferior Innervation
9th -11th intercostal nerves
subcostal (T12) nerve
Serratus Posterior Inferior Motion
depress ribs
What makes up the erector spinae muscles?
Iliocostalis: lateral column
Longissimus: Intermediate column
Spinalis: medial column
Iliocostalis O
Broad tendon from posterior part of the iliac crest
posterior surface of the sacrum
sacro-iliac ligament
sacral and inferior lumbar spinous processes
supraspinous ligament
Iliocostalis I
(lumborum, thoracis, and cervicis): fibers run superiorly to angles of lower ribs and cervical transverse processes
Iliocostalis Innervation
posterior rami of spinal nerve
Iliocostalis Motion
Bilaterally: extend vertebral coulmn and head
when back is flexed, controls movement by gradually lenghtening fibers
Unilaterally: laterally flex vertebral column
Longissimus O
Broad tendon from posterior part of the iliac crest
posterior surface of the sacrum
sacro-iliac ligament
sacral and inferior lumbar spinous processes
supraspinous ligament
Longissimus I
(thoracics, cervicis, and capitis): fibers run superiorly to ribs between tubercles and angles to transverse processes in thoracic and cervical regions and to mastoid process of temporal bone
Longissimus Innervation
posterior rami of spinal nerve
Longissimus Movement
Bilaterally: extend vertebral coulmn and head
when back is flexed, controls movement by gradually lenghtening fibers
Unilaterally: laterally flex vertebral column
Spinalis O
Broad tendon from posterior part of the iliac crest
posterior surface of the sacrum
sacro-iliac ligament
sacral and inferior lumbar spinous processes
supraspinous ligament
Spinalis I
(thoracis, cervicis, and capitis): fibers run superiorly to spinous processes in upper thoracic region and to cranium
Spinalis Innervation
posterior rami of spinal nerve
Spinalis Motion
Bilaterally: extend vertebral coulmn and head
when back is flexed, controls movement by gradually lenghtening fibers
Unilaterally: laterally flex vertebral column
Splenius Capitis O
Arises from nuchal ligament and spinous processes of C7-T6 vertebrae
Splenius Capitis I
fibers run superolaterally to mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone