2Gross Anatomy Lect - Deep Back, Suboccipital Triangle & G.a.s. Ch. 2 (P. 93-101)

Front 1

Extrinsic muscles of the back:
-Categories with function
-NN

Back 1

-superficial (upper limb mvt), intermediate (rib mvt/respiration)
-anterior rami of spinal nerves

Front 2

Intrinsic muscles of the back:
-Categories with function
-NN

Back 2

-deep (maintain vertebral posture, aid in mvt of vertebral column)
-dorsal rami

Front 3

Deep back muscle vasculature

Back 3

dorsal branch of posterior intercostal arteries (which branches from aorta)

Front 4

spinotransversales

Back 4

-splenius capitus and cervicus
-O: spinal processes
-I: transverse processes
-most superficial group of muscles of the deep back muscle group

Front 5

erector spinae

Back 5

-iliocostalis, longissimus, spinalis
-intermediate group of muscles of the deep back muscle group

Front 6

transversopinalis

Back 6

-rotatares, multifidis, semispinalis
-O: transverse processes
-I: spinous processes
-deep group of muscles of the deep back muscle group

Front 7

segmental

Back 7

-interspinous, intertransversarii, levatores costarum
-deepest group of muscles of the deep back muscle group

Front 8

Erector spinae muscle actions

Back 8

-bilaterally: extend vertebral column and head
-unilaterally: lateral flexion
-during flexion: eccentric contraction

Front 9

Where does the semispinalis capitis insert?

Back 9

superior nuchal line of skull

Front 10

Semispinalis fibers span how many spinal segments?

Back 10

4-6

Front 11

action of rotatares muscles

Back 11

contralateral rotation

Front 12

What intrinsic muscles of the back are not NN by dorsal rami?

Back 12

lateral parts of intertransversari muscles. These are innervated by ventral rami of spinal nerves

Front 13

Thoracolumbar fascia:
-its 3 layers
-muscles it covers

Back 13

-anterior, middle, posterior
-erector spinae is covered by posterior layer; quadratus lomborum is covered by anterior layer

Front 14

thoracolumbar fascia envelops what category of back muscles?

Back 14

deep

Front 15

Suboccipital triangle:
-Boundaries
-Floor
-Roof
-Contents

Back 15

-Boundaries
Superiomedially – Rectus capitis posterior major
Superiolaterally – Superior oblique
Inferiolaterally – Inferior oblique
-Floor: postior aspect of atlanto-occiptal membrane, posterior arch of C1
-Roof: semispinalis capitis
-Contents: vertebral a., suboccipital nerve (dorsal ramus of C1)