Lecture 8: Deep Back Flashcards
Covers the deep muscles of the back and contributes to the overall organization and integrity of the region
Thoracolumbar fascia
3 layers of thoracolumbar fascia in lumbar region
Posterior
Medial
Anterior
Deep back groups of muscles from superficial to deep
- Splenius muscles .Also called (spinotransversales) , mainly in the neck
- Erector spinae: vertically oriented
- Transversospinalis: in general run superomedially, associated with vertebral column throughout back
- Segmental muscles - more of proprioception than movement of vertebral column
Action of Splenius capitis
Action: Bilaterally draw head backward , extending the neck. Unilaterally draw and rotate the head to the same side
Blood supply of splenius capitis
Innervation of splenius capitis
Blood:
Innervation: posterior rami of middle cervical nerves
Action of splenius cervicis
Actions : together extend the neck . Individually draw and rotate the head to same side
Blood supply of splenius cervicis
Innervation of splenius cervicis
Innervation : posterior rami of lower cervical nerves
Erector spinae muscles from lateral to medial
Iliocosatalis
Longissimus
Spinalis
Action of iliocostalis
Action: extends and laterally
flexes vertebral column
Blood supply of iliocostalis
Nerve supply of iliocostalis
Blood: posterior intercostal arteries
Nerve: dorsal primary rami of cervical, thoracic and lumbar spinal nerves
Action of longissimus
Action: capitis muscle extends and rotates the head;
-cervicis and thoracis muscles extend and laterally flex the vertebral column
Blood supply of longissimus
Nerve supply of longissimus
Blood: posterior intercostal arteries
Nerve: dorsal primary rami of cervical, thoracic, and lumbar nerves
Action of spinalis
Action: extends vertebral column
Blood supply of spinalis
Nerve supply of spinalis
Blood: posterior intercostal arteries
Nerve: dorsal primary rami of cervical and thoracic spinal nerves
Transversospinalis muscles from superficial to deep
Semispinalis
Multifidus
Rotatores
Action of semispinalis
Action: Extends vertebral column; rotate head and vertebral column to contralateral side
Blood supply of semispinalis
Nerve supply of semispinalis
Blood: posterior intercostal arteries
Nerve: dorsal rami of cervical, thoracic and lumbar spinal nerve
Action of multifidus
Action: Acting bilaterally it extends the vertebral column
Acting unilaterally it rotates the trunk to the opposite side
Blood supply of multifidus
Nerve supply of multifidus
Blood: posterior intercostal arteries
Nerve: dorsal rami
Deepest back layer under multifidus
Rotatores
Name the 2 groups segmental muscles
- The first group of segmental muscles are the levatores costarum
- The second group consists of true segmental muscles the interspinales and the intertransversarii
Action of levatores costarum
Elevate ribs
Blood supply of levatores costarum
Nerve supply of levatores costarum
Blood: posterior intercostal artery
Nerve: dorsal rami of C8-T11
Action of Interspinalis
Postural muscle that stabilizes the adjoining vertebrae during movements of vertebral column
Blood supply of Interspinalis
Nerve supply of Interspinalis
Blood: posterior intercostal artery
Nerve: dorsal primary rami of spinal nerves
Action of Intertransversarii
Postural muscles that stabilize adjoining vertebrae during movements of vertebral column.
Blood supply of intertransversarii
Nerve supply of intertransversarii
Blood: posterior intercostal artery
Nerve: dorsal rami of spinal nerves
Muscle that cause stereotypical back pain
Erector spinae muscle
Organ disease that refer as back pain
from a number of organs e.g pancreas , kidneys , enlarged lymph nodes ( Hodgkin,s lymphoma ) , abdominal aortic aneurysm.
Rectus capitis posterior major
from Cv2 (axis) spinous process to occipital bone & extends head
Rectus capitis posterior minor
muscle runs from posterior tubercle of Cv1 to occipital bone & it extends head
Oliquus capitis inferior
arises from the spinous process of C2 vertebra and inserts into transverse of C1 vertebra.
Obliquus capitis superior
arises from the transverse of C1 and inserts into the occipital bone between the superior and inferior nuchal lines .
Suboccipital Triangle muscles are innervated by
posterior ramus of spinal nerve C1 (suboccipital nerve)
Occipital artery supplies
splenius capitis and obliquus capitis superior
Reduced blood supply to brain through which artery
Vertebral artery
