II. Images: Dermatomes
III. Exam: Pearls - Cold Sensation testing
IV. Exam: Dermatomes - Upper body Sensory Innervation
- Quick Exam Pearls
- Torso: C4-Clavicle, T4-Nipple Line, T10-Umbilicus, L1-Inguinal
- Hand: Dorsal first web space (Radial Nerve, C6), Thenar eminence (Median Nerve, C7), Hypothenar eminence (Ulnar Nerve, C8)
- C1-2: Occipital and parietal region Sensation
- C3: Lower pinna, posterior cheek, temporal region and lateral neck
- C4: Dermatome along Scapular spine, mid-deltoid and clavicle
- C5: Deltoid, Lateral Upper Arm and Forearm
- C6: Thumb, Index Finger, lateral Forearm (Radial Nerve) - dorsal first web space
- C7: Index, Middle and Ring Fingers, triceps (Median Nerve) - thenar eminence
- C8: Middle, Ring and Little Finger (pinky), medial Forearm (Ulnar Nerve) - hypothenar eminence
- T1: Ulnar hand, axilla to olecranon
- T4: Nipple
- T8: Xiphoid
- T10: Umbilicus
- T12: Symphysis
V. Exam: Dermatomes - Lower body Sensory Innervation
- L1: Inferior to iliac crest
- L3: Anterior and medial thigh down to knee
- L4: Anterior low leg and medial foot
- L5: Lateral leg, heel, dorsal foot, web space between 1st and second toes
- S1: Posterior leg, lateral Foot, dorsal fifth toe
- S3: Ischial tuberosity area
- S4-5: Perianal region