Figure 2-3. Anterior view of dermatomes. Although dermatomes are shown as distinct segments, some overlap occurs between any two adjacent dermatomes. Shaded areas in the table indicate dermatomes that are affected by a herniated disk (see Chapter 1 I D 15). [The sensory innervation of the face does not involve dermatomes. It is provided by cranial nerve V (CN V): V1 (ophthalmic division), V2 (maxillary division), and V3 (mandibular division).] Knowledge of dermatomes is important because clinical vignette questions include a description of sensory loss at a specific dermatome level.

3. Tabes dorsalis (dorsal column disease) is caused by damage to the sensory pathways of the dorsal column. Clinical findings include: loss of tactile discrimination, vibration sensation, and proprioception.

4. Brown-Sequard syndrome (incomplete spinal cord injury, or hemisection)

a. Brown-Sequard syndrome may be caused by a penetrating blow to the dorsal columns, lateral corticospinal tract, lateral spinothalamic tract, hvpothalamo-spinal tract, or ventral gray horn.

b. Clinical findings include: ipsilateral loss of tactile discrimination, vibration sensation, and proprioception; ipsilateral spastic paresis with pyramidal signs below the lesion; contralateral loss of pain and temperature one segment below the lesion; ipsilateral Horner syndrome; and ipsilateral flaccid paralysis.

5. Anterior spinal artery occlusion a. Anterior spinal artery occlusion results in damage to the following systems: lateral corticospinal tracts, lateral spinothalamic tracts, hypothalamospinal tracts, ventral gray horns, and corticospinal tracts to sacral parasympathetic centers at

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Pregnancy Guide

Pregnancy Guide

A Beginner's Guide to Healthy Pregnancy. If you suspect, or know, that you are pregnant, we ho pe you have already visited your doctor. Presuming that you have confirmed your suspicions and that this is your first child, or that you wish to take better care of yourself d uring pregnancy than you did during your other pregnancies; you have come to the right place.

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