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neuro9 spinal level

QuestionAnswer
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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