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Related Subjects: |Radial Nerve |Median Nerve |Ulnar Nerve |Musculocutaneous nerve |Axillary nerve |Brachial plexus |Dermatomes
The arms are C5 to T1
Dermatomes are areas of skin that are mainly supplied by a single spinal nerve. Understanding dermatomes is crucial in diagnosing and managing neurological disorders and injuries. Below is a detailed description of the key dermatomes in the human body.
Region | Spinal Nerve | Description |
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Face back to vertex | Trigeminal Nerve (CN V) | The trigeminal nerve covers the facial region, including the forehead, cheeks, and jaw. |
Back of head | C2 | The C2 dermatome covers the posterior aspect of the head and the upper neck. |
Tip of the shoulder | C5 | The C5 dermatome includes the lateral aspect of the shoulder and the upper arm. |
Outside lateral border of arm and hand | C6 | The C6 dermatome includes the lateral side of the forearm, thumb, and part of the hand. |
Middle finger | C7 | The C7 dermatome encompasses the middle finger and the middle part of the hand. |
Medial border of hand and arm | C8 | The C8 dermatome includes the medial side of the forearm and hand, including the little finger. |
Nipple | T4 | The T4 dermatome is at the level of the nipples and extends horizontally around the chest. |
Umbilicus | T10 | The T10 dermatome is located at the level of the umbilicus (navel) and extends horizontally around the abdomen. |
Groin | L1 | The L1 dermatome covers the groin area and the upper part of the inner thigh. |
Knee | L3 | The L3 dermatome includes the anterior part of the thigh and the area around the knee. |
Back of legs | S1, S2 | The S1 and S2 dermatomes cover the sole of foot and posterior aspect of the legs and thighs. |
Perianal region | S3, S4, S5 | The S3, S4, and S5 dermatomes encompass the perianal area, including the genitals and anus. |
Understanding the dermatomal distribution of the spinal nerves is crucial for diagnosing and managing various neurological and musculoskeletal conditions. Each dermatome corresponds to a specific spinal nerve, providing a map for sensory innervation of the skin. Accurate knowledge of dermatomes assists in pinpointing the site of nerve injuries and other pathological conditions.
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