Hamilton-Norwood
baldness scale |  |
| External ear |  |
| Triangles of the neck |
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| Anterior neck muscles |  |
| Finger anatomy |
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| Finger pulleys |
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Mallet finger
(forced hyperflexion at DIP joint) |
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Volar plate avulsion
(Hyperextension at PIP joint) |
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Boutonniere deformity
(central slip of extensor disruption at PIP joint) |
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| Superficial back musculature |
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| Deep back musculature |
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| Knee ligaments |
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Sensory innervation
of the leg |
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Ankle:
Lateral view
Medial view |
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| Ankle Retinacula |  |
Sensory innervation of the foot
(plantar) |
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| Dermatomes |
- C2 - At least one cm lateral to the occipital protuberance at the base of the skull. Alternately, a point at least 3 cm behind the ear.
- C3 - In the supraclavicular fossa, at the midclavicular line.
- C4 - Over the acromioclavicular joint.
- C5 - On the lateral (radial) side of the antecubital fossa, just proximally to the elbow.
- C6 - On the dorsal surface of the proximal phalanx of the thumb.
- C7 - On the dorsal surface of the proximal phalanx of the middle finger.
- C8 - On the dorsal surface of the proximal phalanx of the little finger.
- T1 - On the medial (ulnar) side of the antecubital fossa, just proximally to the medial epicondyle of the humerus.
- T2 - At the apex of the axilla.
- T3 - Intersection of the midclavicular line and the third intercostal space
- T4 - Intersection of the midclavicular line and the fourth intercostal space, located at the level of the nipples.
- T5 - Intersection of the midclavicular line and the fifth intercostal space, horizontally located midway between the level of the nipples and the level of the xiphoid process.
- T6 - Intersection of the midclavicular line and the horizonal level of the xiphoid process.
- T7 - Intersection of the midclavicular line and the horizontal level at one quarter the distance between the level of the xiphoid process and the level of the umbilicus.
- T8 - Intersection of the midclavicular line and the horizontal level at one half the distance between the level of the xiphoid process and the level of the umbilicus.
- T9 - Intersection of the midclavicular line and the horizontal level at three quarters of the distance between the level of the xiphoid process and the level of the umbilicus.
- T10 - Intersection of the midclavicular line, at the horizontal level of the umbilicus.
- T11 - Intersection of the midclavicular line, at the horizontal level midway between the level of the umbilicus and the inguinal ligament.
- T12 - Intersection of the midclavicular line and the midpoint of the inguinal ligament.
- L1 - Midway between the key sensory points for T12 and L2.
- L2 - On the anterior medial thigh, at the midpoint of a line connecting the midpoint of the inguinal ligament and the medial epicondyle of the femur.
- L3 - At the medial epicondyle of the femur.
- L4 - Over the medial malleolus.
- L5 - On the dorsum of the foot at the third metatarsophalangeal joint.
- S1 - On the lateral aspect of the calcaneus.
- S2 - At the midpoint of the popliteal fossa.
- S3 - Over the tuberosity of the ischium or infragluteal fold
- S4 and S5 - In the perianal area, less than one cm lateral to the mucocutaneous zone
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