Deep Back and Spinal Cord

how many cord segments are there?

31 unlike 33 vertebrae

Football player herniated intervertebral disc - disk compresses the spinal nerve exiting through the intervertebral foramen between the 5th and 6th cervical vertebrae. The _______ spinal nerve is affected

C 6

the subtrapezial plexus of nerves includes

C3 C4 and the accessory nerve

which structure does NOT contain efferent autonomic nerve fibers?

Dorsal root of T6

When imaging the spinal cord through a myelogram - one needs to inject the dye without injury to the spinal cord below what vertebral level?

L 4

Man herniates intervertebral disk between 4th and 5th lumbar vertebrae. Disk compresses nerve in the intervertebral foreman immediately posterior to the disk - which spinal nerve is affected?

L 5

lumbar puncture is performed to remove CSF. If done properly the needle will not penetrate this layer......

Pia mater

Both the dural sac and the subarachnoid space end at which vertebral level?

S 2

A neuron with a cell body in the dorsal root ganglia could convey what type of fibers?

Sensory from the skin overlying the trapezius

in an adult, the conus medullar is of the spinal cord is normally positioned at which vertebral body levels?

T12-L2

man has amyotrophic lateral sclerosis (Lou Gehrigs disease). Where would one expect to see atrophic or degenerated nerve cell bodies?

Ventral horn of the spinal cord

The intervertebral disc adds....

about 1/4th to entire length of vertebral column

which is a source of axons found in the dorsal primary rams of the 4th thoracic spinal nerve?

afferent neurons arising from the skin overlying the trapezius muscle

During a myelogram, dye leaked in the mid cervical region. What layer must have been torn or ruptured for dye to leak out?

arachnoid

in the lumbar spine, the L4 nerve root sleeve exits.....

below the pedicle of L4 and at the top of the intervertebral foramen

the number of vertebrae and number of spinal cord segments are the same in each region except?

cervical

what reference point is used to identify L4?

crest of the ilium

inserting spinal tap needle in the midline, you hear a pop at the needle tip...what was perforated?

dura mater

which muscle is innervated by posterior primary rami?

erector spinae

what landmark is used to insert needle between 4th and 5th lumbar vertebral spines?

iliac crest

which veins are especially important in the metastatic spread of cancer?

internal vertebral venous plexus

student lifts heavy box and feels sharp pain radiating down anterior thigh and medial side of his leg - told he has a herniated disk at L4. the point of compression of the nerve is the.....

intervertebral foramen

dorsal primary ramus

is part of the spinal nerve which supplies the true back muscles and the skin overlying them.

in order to expose the spinal cord from the posterior side, it is necessary to remove the....

laminae, spinous processes and ligament flavum

one removes the laminae of two adjacent vertebrae to expose spinal cord....which ligament is removed?

ligamentum flavum

the denticulate ligament is a modification of the.....

pia mater

dorsal and ventral rootlets of 5th n did 6th cervical nerves had been torn....what nerve fibers would not be damaged?

pre and postganglionic sympathetic

lumbar puncture is performed to remove CSF. the fluid would be removed from the.....

subarachnoid space at the level of L4

panniculus adiposus refers to an abundance of fat in the....

subcutaneous tissue

spinal needle passes through what ligament during a lumber puncture at L4?

supraspinous

lack of vasoconstriction can be due to interruption of what fibers somewhere along their course to make patients face flushed?

sympathetic

The conus medullaris gives origin to.....

the most of the cauda equina

Kyphosis is the curvature of which region of the spine?

thoracic

82 year old man dies of prostate cancer - autopsy reveals tumor sites in the prostate, vertebral column, and brain....what vascular pathway did the cancerous cells get to the brain?

vertebral venous plexus

during lumbar puncture - needle inserted posteriorly in the midline until it penetrated the posterior longitudinal ligament, would needle entered the subarachnoid space?

yes