<s>[INST] context: ANS. A# Important dermatomesCl-No sensory supplyC2-OcciputC5-Shoulder region (deltoid)C7-Middle finger areaT2/T3-AxillaT7-EpigastriumT10-UmblicusT12-Pubic symphysisL3-KneeL5-Outer aspect of legS1-Lateral aspect of sole (walking on S1)S3, S4, S5-Around the anus (sitting on S3,4,5)# Important spinal segments to rememberC5-Abduction of shoulderC6-Flexion of elbowC7-Extension of elbowC8-Wrist flexion and extensionT1-Small muscles of handL1-Flexion of hipL2-Adduction of hipL3-Extension of kneeL4-Dorsiflexion of ankle and inversion of footL5-Eversion of footS1-Plantar flexion of ankleS2, 3-Small muscles of footL4, L5-Abduction of hipL5, SI-Extension of hip and flexion of kneeL5-Extensor digitorum hallucisS1-Flexor digitorum hallucis# Root value of reflexesSuperficial reflexesConjunctival and corneal reflex: Trigeminal (ophthalmic division)Superficial abdominal reflex: T7-T12 spinal segmentsAnal reflex: S2, 3, 4Bulbocavernous reflex: S3, 4 (pudendal nerve)Plantar reflex: L5, S1Cremastric reflex: L1, L2 (ilioinguinal nerve--afferent and genitofemoral nerve--efferent).Deep reflexesBiceps reflex: C5, 6 (musculocutaneous nerve)Supinator reflex: C5, 6 (radial nerve)Triceps reflex: C6, 7 (radial nerve)Knee jerk: L2 ,3, 4 (femoral nerve)Ankle jerk: SI, 2 spinal segments [/INST] question: Root value of cremastric reflex? | options: A: L1-L2 B: L2-L3 C: S1-S2 D: L4-L5 | answer: A </s>