All 13 questions from your CNS Group-A paper are answered above. Here is a quick summary of what is covered:

Q1 - Limbic system components with diagram, hypothalamic vegetative functions, and reward/punishment centres (dopaminergic system).

Q2 - Three functional divisions of cerebellum (vestibulocerebellum, spinocerebellum, cerebrocerebellum), afferent/efferent connections with diagrams, functions, and clinical features of lesion (DASHING).

Q3, Q4, Q10 - Combined answer covering basal ganglia components, direct and indirect pathways, functions, Parkinsonism features (TRAP), and treatment including L-DOPA.

Q5 - Synapse definition, EPSP/IPSP, ionic basis with Na⁺/Cl⁻ mechanisms, and all 7 properties.

Q6 - Pyramidal tract from origin (Betz cells, areas 4/6) through internal capsule, medullary decussation to spinal cord, plus Babinski sign and its UMN significance.

Q7 - Muscle tone definition, gamma loop maintenance mechanism, spasticity vs. rigidity differences in a comparison table.

Q8, Q11 - Pain pathway (Aδ/C fibres → DRG → spinothalamic tract → thalamus → cortex), gate control theory, descending PAG pathway, and stress analgesia with endogenous opioid basis.

Q9 - Cerebellar internal circuit (mossy/climbing fibres, Purkinje cells, deep nuclei), error-correction function, ipsilateral deficit pattern.

Q12 - Cerebellar ataxia definition, features, Romberg negative, contrast with sensory ataxia.

Q13 - Stretch reflex, muscle spindle structure, reflex arc diagram, reciprocal innervation (Ia inhibitory interneuron), and Renshaw cell glycinergic feedback inhibition.

All answers use the format expected in 1st MBBS exams: definitions, mechanisms, labelled diagram descriptions, clinical correlations, and comparison tables where relevant.