Deep Layer of Intrinsic Back Muscle

Question 0

Semispinalis (capitas, cervicis, thoracis)

Answer 0

• most superficial spanning 4 to 6 segments
• capitas is responsible for the longitudinal buldge on each side in the back of the neck near the medial plane
• thoracic and cervici pass superomedially from transverse process to the thoracic and cervical spinous process of more superior vertebrae

Question 1

Transversospinalis Muscles

Answer 1

• Obliquely disposed
• Semispinalis, multifidus, rotatores
• originate from transverse process of vertebrae andpass to spinous processes of more superior vertebrae

Question 2

Semispinalis origin

Answer 2

Origin:

Arise from the transverse processes of C4-T10 vertebrae

Question 3

Semispinalis Insertion (capitas, cervicis)

Answer 3

Fibers run superomedially to occipital bone and spinous processes in upper thoracic and cervical region spanning 4 to 6 segments

Question 4

Semispinalis Innervation

Answer 4

posterior rami of spinal nerves

Question 5

Semispinalis Main Actions

Answer 5

Extends head and thoracic and cervical regions of vertebral column and rotates contralaterally

Question 6

Multifidus Origin

Answer 6

Arise from posterior sacrum, posterior superior iliac spine, aponeurosis of erector spinae, sacroilliac ligaments, mammillary process of lumbar vertebrae, transverse process of T1-T3 and articular process of C4-C7

Question 7

Multifidus Insertion

Answer 7

thickest in lumbar region, fibers pas obliquely superiomedially to enntire length of spinous process of vertebrae located 2-4 segments superior to origin

Question 8

Multifidus Nerve Supply

Answer 8

Posterior rami of spinal nerves

Question 9

Multifidus Main Action

Answer 9

Unilateral contraction rotate to contralateral side, stabilized vertebrae during local movements of vertebral column

Question 11

Rotatores Insert

Answer 11

Fibers pass superomedially to atach to junction of lamina and transverse process or spinous process of vertebrae immediately BREVIS or 2 segments LONGUS

Question 12

Rotatores Innervation

Answer 12

Posterior rami of spinal neres

Question 13

Rotatores Main Actions

Answer 13

may function as organs of proprioception; stabilize vertebrae and assist with local extension and rotating movements of vertebral column

Question 23

Rotatore (Brevis and Longus) Origin

Answer 23

arise from transverse processes of vertebrae best developed in thoracic region