Info

RIGHT EYE (CN III, IV, VI)
CN V—SENSORY

Trapezius muscle

Trapezius muscle

CN XI—MOTOR

5 sacral, and 1 coccygeal. Each nerve has an anterior (ventral) root containing motor fibers, and a posterior (dorsal) root containing sensory fibers. The anterior and posterior roots merge to form a short (<5 mm) spinal nerve. Spinal nerve fibers commingle with similar fibers from other levels to form peripheral nerves. Most peripheral nerves contain both sensory (afferent) and motor (efferent) fibers.

Like the brain, the spinal cord contains both gray matter and white matter. Nuclei of gray matter, which are aggregations of nerve cell bodies, are surrounded by white tracts of nerve fibers connecting the brain to the peripheral nervous system. Note the butterfly appearance of the gray matter nuclei, with anterior and posterior horns.

Posterior horn

Posterior root Posterior root

Posterior horn

Posterior root Posterior root

THE SPINAL CORD, CROSS SECTION
Coping with Asthma

Coping with Asthma

If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.

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