Examination of Power and Sensation
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| Levels of Principal Dermatomes | |
|---|---|
| C5 | Clavicles |
| C5, 6, 7 | Lateral parts of upper limbs |
| C8; T1 | Medial sides of upper limbs |
| C6 | Thumb |
| C6, 7, 8 | Hand |
| C8 | Ring and little fingers |
| T4 | Level of nipples |
| T10 | Level of umbilicus |
| T12 | Inguinal or groins regions |
| L1, 2, 3, 4 | Anterior and inner surfaces of lower limbs |
| L4, 5; S1 | Foot |
| L4 | Medial side of great tone |
| L5; S1, 2 | Outer and posterior sides of lower limbs |
| S1 | Lateral margin of foot and little toe |
| S2, 3, 4 | Perineum |
A PR examination is performed and there is reduced anal tone
You move onto examining sensation and note Jane has sensory loss to pin prick in the perineal region
This is sacral dermatomes S2-S5
These nerves provide sensory innervation to the perineum, rectum and inner thigh
Sensory loss in the perineal region is referred to as saddle anaesthesia
