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Notes from PTA Exam Study guide by scorebuildrs.

C1 Myotome


C2 Myotome

Longus Colli, Sternocleidomastoid, Rectus Capitis

C3 Myotome

Trapezius, Splenius Capitis

C4 Myotome

Trapezius, Levator Scapulae

C5 Myotome

Supraspinatus, Infraspinatus, Deltoid, Biceps

C6 Myotome

Biceps, Supinator, Wrist Extensors

C7 Myotome

Triceps, Wrist flexors

C8 Myotome

Ulnar Deviators, Thumb Extensors, Tumb Adductors

T1-T2 Myotome

Weakness of intrinsic muscles of the hand, Dural and nerve root stress has T1 elbow flexion with arm horizontal. T1 and T2 scapulae forward and backward on chest wall. Neck flexion at any thoracic level.

T3-T12 Myotome

Articular and dural signs and root pain are common. Root signs are rare and have such indefiinite area that they have litt localizing value. Weakness is not detectable.

L1 Myotome


L2 Myotome

Psoas, hip adductors

L3 Myotome

Psoas, quadriceps, thigh atrophy

L4 Myotome

Tibialis anterior, extensor hallucis

L5 Myotome

Extensor Hallucis, Peroneals, Gluteus Medius, Dorsiflexors, Hamstrings and Calf Atrophy

S1 Myotome

Calf and Hamstring, Wasting of Gluteals, Peroneals, Plantar Flexors

S2 Myotome

Calf and Hamstring, Wasting of Gluteals, Plantar Flexors

S3 Myotome


S4 Myotome

Bladder, Rectum


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