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neuro9 spinal level
| Question | Answer |
|---|---|
| C1 Dermatome: | Vertex of skull |
| C1 Muscle weakness (myotome): | None |
| C1 Reflexes affected: | None |
| C2 Dermatome: | Temple, forehead, occiput |
| C2 Muscle weakness (myotome): | Longus colli, sternocleidomastoid, rectus capitis |
| C2 Reflexes affected: | None |
| C3 Dermatome: | Entire neck, posterior cheek, temporal area, prolongation forward under mandible |
| C3 Muscle weakness (myotome): | Trapezius, splenius capitis |
| C3 Reflexes affected: | None |
| C4 Dermatome: | Shoulder area, clavicular area, upper scapular area |
| C4 Muscle weakness (myotome): | Trapezius, levator scapulae |
| C4 Reflexes affected: | None |
| C5 Dermatome: | Deltoid area, anterior aspect of entire arm to base of thumb |
| C5 Muscle weakness (myotome): | Supraspinatus, infraspinatus, deltoid, biceps |
| C5 Reflexes affected: | Biceps, brachioradialis |
| C6 Dermatome: | Anterior arm, radial side of hand to thumb and index finger |
| C6 Muscle weakness (myotome): | Biceps, supinator, wrist extensors |
| C6 Reflexes affected: | Biceps, brachioradialis |
| C7 Dermatome: | Lateral arm and forearm to index, long, and ring fingers |
| C7 Muscle weakness (myotome): | Triceps, wrist flexors (rarely, wrist extensors) |
| C7 Reflexes affected: | Triceps |
| C8 Dermatome: | Medial arm and forearm to long, ring, and little fingers |
| C8 Muscle weakness (myotome): | Ulnar deviators, thumb extensors, thumb adductors (rarely, triceps) |
| C8 Reflexes affected: | Triceps |
| T1 Dermatome: | Medial side of forearm to base of little finger |
| T1 Muscle weakness (myotome) | and reflexes affected: Disk lesions at upper two thoracic levels do not appear to give rise to root weakness. Weakness of intrinsic muscles of the hand is due to other pathology (e.g., thoracic outlet pressure, neoplasm of lung, and ulnar nerve lesion). |
| T2 Dermatome: | Medial side of upper arm to medial elbow, pectoral and midscapular areas |
| T2Muscle weakness (myotome) and reflexes affected: | Disk lesions at upper two thoracic levels do not appear to give rise to root weakness. Weakness of intrinsic muscles of the hand is due to other pathology (e.g., thoracic outlet pressure, neoplasm of lung, and ulnar nerve lesion). |
| T3–T12 Dermatome: | T3-T6, upper thorax; T5-T7, costal margin; T8-T12, abdomen and lumbar region |
| T3–T12 Muscle weakness (myotome) | and reflexes affected: Articular and dural signs and root pain are common. Root signs (cutaneous analgesia) are rare and have such indefinite area that they have little localizing value. Weakness is not detectable. |
| L1 Dermatome: | Back, over trochanter and groin |
| L1 Muscle weakness (myotome): | None |
| L1 Reflexes affected: | None |
| L2 Dermatome: | Back, front of thigh to knee |
| L2 Muscle weakness (myotome): | Psoas, hip adductors |
| L2 Reflexes affected: | None |
| L3 Dermatome: | Back, upper buttock, anterior thigh and knee, medial lower leg |
| L3Muscle weakness (myotome): | Psoas, quadriceps, thigh atrophy |
| L3Reflexes affected: | Knee jerk sluggish, PKB positive, pain on full SLR |
| L4 Dermatome: | Medial buttock, lateral thigh, medial leg, dorsum of foot, big toe |
| L4 Muscle weakness (myotome): | Tibialis anterior, extensor hallucis |
| L4 Reflexes affected: | SLR limited, neck flexion pain, weak or absent knee jerk, side flexion limited |
| L5 Dermatome: | Buttock, posterior and lateral thigh, lateral aspect of leg, dorsum of foot, medial half of sole, first, second, and third toes |
| L5 Muscle weakness (myotome): | Extensor hallucis, peroneals, gluteus medius, dorsiflexors, hamstring and calf atrophy |
| L5 Reflexes affected: | SLR limited one side, neck flexion painful, ankle decreased, crossed-leg raising pain |
| S1 Dermatome: | Buttock, thigh, and leg posterior |
| S1 Muscle weakness (myotome): | Calf and hamstrings, wasting of gluteals, peroneals, plantar flexors |
| S1 Reflexes affected: | SLR limited, Achilles reflex weak or absent |
| S2 Dermatome: | Same as S1 |
| S2 Muscle weakness (myotome): | Same as S1 except peroneals |
| S2 Reflexes affected: | Same as S1 |
| S3 Dermatome: | Groin, medial thigh to knee |
| S3 Muscle weakness (myotome): | None |
| S3 Reflexes affected: | None |
| S4 Dermatome: | Perineum, genitals, lower sacrum |
| S4 Muscle weakness (myotome): | Bladder, rectum |
| S4 Reflexes affected: | None |
Created by:
micah10
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