18Typical Spinal Nerve And Plexuses

Front 1

Radiculopathies:
Sensory or motor dysfunction caused by injury to a nerve root or spinal nerve
Injuries to posterior (dorsal) roots cause sensory disturbances
Injuries to anterior (ventral) roots cause motor disturbances
Most commonly, radiculopathies are due to ___
Often, burning pain or tingling radiates in affected dermatome
The pattern of sensory deficits or symptoms is ___!!
For example, injury to the C6 spinal nerve would cause a sensory deficit in the C6 dermatome, the autonomous zone of which is the___
Motor deficits may result in muscle ___ (weekness), atrophy and fasciculations
Muscles are not normally paralyzed if only one root is affected
For example, if the C6 anterior root is injured, the biceps is weak, not paralyzed

Back 1

-vertebral disc herniation
-dermatomal
- pad of the thumb.
-paresis

Front 2

Neuropathies:
Sensory or motor dysfunction caused by pathology affecting a ___
Neuropathies can result from metabolic disorders such as diabetes mellitus
Diabetic neuropathy – glove and stocking
Can manifest as burning pain or tingling radiates in affected nerve distribution
Sensory deficits involve portions of ___ dermatomes
Motor neuropathies cause muscle ___, atrophy, and fasciculations

Back 2

-peripheral nerve
-adjacent
-paralysis

Front 3

The musculocutaneous nerve of the upper limb is a stereotypical “mixed” nerve with sensory and motor axons from spinal cord segments ___.

Back 3

C5, C6 and C7

Front 4

Radial n: spinal cord segments ___.

Back 4

C5-T1

Front 5

The preaxial mass gives rise to

Back 5

flexors, adductors and medial rotators; think - crossed arms, hugging yourself

Front 6

The postaxial mass gives rise to

Back 6

extensors, abductors, and lateral rotators; think titanic- arms out

Front 7

The ANTERIOR DIVISIONS innervate muscles derived from the

Back 7

preaxial mass

Front 8

The POSTERIOR DIVISIONS innervate muscles derived from the

Back 8

postaxial mass