Day 37 (Accessory Muscle of the Vertebral Column, anterior & lateral deep cervical musculature,posterior abdominal muscles, nine common ligaments, intervertebral disc) Flashcards
Which of the cervical intertransversarii is innervated by dorsal rami of cervical spinal nerves?
posterior medial belly, cervical intertransversarii
What is the origin of the medial belly of the lumbar intertransversarii?
accessory process of transverse process L1-L4, mammillary process of superior articular process L1-L4
Which muscle group is innervated by both dorsal rami and ventral rami of spinal nerves?
intertransversarii
Based on the density of muscle spindles what is the proposed function of the intertransversarii?
acts as a proprioceptive transducer in conjuction with interspinalis to coordinate the smooth movement of the spine and to maintain appropriate posture
What is the origin of the longus colli?
vertebral bodies of C5-C6 & anterior tubercles of transverse processes C3-C5
What is the origin of the rectus capitis anterior?
lateral mass & costal element of the transverse process of C1
What will innervate the rectus capitis anterior?
ventral rami of C1-C2 spinal nerves
What will innervate the rectus capitis lateralis?
the ventral rami of C1-C2 spinal nerves
What is the insertion of the anterior scalene?
ridge and anterior scalene tubercle of the first rib
What is the insertion of the middle scalene?
between the tubercle and groove for the subclavian artery on the first rib
What is the insertion of the posterior scalene?
outer surface of second rib
What will innervate the posterior scalene?
the ventral rami of C6-C8 spinal nerves
The quadratus lumborum is implicated in the formation of which ligament?
the iliolumbar ligament
What is the origin of the psoas major?
vertebral bodies T12, L1-L5, S1 and transverse processes of L1-L5
What is the origin of the psoas minor?
vertebral bodies T12, L1
What will innervate the psoas minor?
the ventral ramus of L1 spinal nerve
What is the maximum number of common ligaments identified with a vertebral couple?
eight
What is the reason that nine common ligaments are identified but only eight will be attached at any specific vertebral couple?
the ligamentum nuchae and supraspinous ligaments attach to the spinous tubercles, but only one of these will be identified at a single vertebral couple
What is the number of true intervertebral discs identified in the adult?
twenty-three
In the adult which vertebral levels will demonstrate a true intervertebral disc?
those between C2 and S1 inclusive
What is the percent of intervertebral disc height contribution to the length of each region of the vertebral column?
cervical…22-25%; thoracic…20%; lumbar…33%
What are the names of the central, peripheral, and horizontal zones of the intervertebral disc?
nucleus pulposus….central zone; annulus fibrosus…peripheral zone; cartilaginous end plate…horizontal zone
What is the water concentration in the lumbar nucleus pulposus at birth and after thirty?
birth…88%; thirty…70%
What is the consequences of non-aggregated glycosaminoglycans in the lumbar nucleus pulposus?
the nucleus pulposus will loose water under deformation conditions
What cell is associated with the nucleus pulposus until about age eleven?
notochord cells
Which type of collagen is dominant in the nucleus pulposus?
collagen type II
What is the organizational pattern for collagen fibers in the nucleus pulposus?
they are irregularly oriented and randomly scattered
What is the appearance of the cervical annulus fibrosus?
a horse-shoe with the anterior margin tick and the lateral margins tapering to the uncinate processes; the posterior margin is thin
