Back And Spinal Cord Flashcards
At what level does the spinal cord extend to in adults
L1/L2
Name the three layers covering the CNS
Meninges made up of dura mater, arachnoid mater and pia mater
What is the filum terminale
Extension of the pia mater that extends from the conus medullaris to anchor the spinal cord to the coccyx
What passes through an intervertebral foramen
Spinal nerves
What occupies the vertebral canal below L2
Cause equina
What do the dorsal rami of a spinal nerve supply
Motor supply to posterior muscles of the back eg erector spinae and posterior part of the dermatome - sensation to posterior skin
How man bones are fused to form the sacrum
5
Which vertebra has an odontoid peg
C2 the axis
What type of joint includes the intervertebral disc
Symphysis or secondary cartilaginous
Which major muscle antagonizes flexion of the vertebral Colombian and therefore allows movement to occur in a controlled manner
Erector spinae
At each spinal segment which branch of the spinal nerve would you expect to contain most axons and why
Ventral, supplies all the lateral region aswell as anterior. Dorsal Ramos only supplies the back
What types of somatic nerve fibers will be present in the dorsal ramus of the spinal nerve
Somatic motor and sensory
From which spinal nerve segments do preganglionic sympathetic motor nerves emerge from the spinal cord
T1-L2
What is meant my the term lordosis
Convex anterior curvature (term used clinical to describe exaggerated and therefore abnormal curvature although the term used in anatomy to describe the normal convex anterior curvature found the the lumbar and cervical regions)
What is meant by the term scoliosis
Lateral curvature of the vertebral column (always abnormal)
Which nerves contribute to the lumbar plexus
L1-L4
What is the difference between the autonomic nerve arc and the somatic nerve arc
A somatic arc contains an interneuron in the spinal cord
What occupies a dorsal root ganglion
Cell body of sensory pseudounipolar neuron