In the internal capsule, the corticobulbar fibres occupying the genu are somatotopically arranged such that fibres to the lower face motor cortex lie:
- A In the anterior limb
- B At the genu itself ✓
- C In the posterior limb anterior portion
- D In the retrolenticular part
Correct answer: B. At the genu itself
Explanation
Corticobulbar (corticonuclear) fibres run in the genu of the internal capsule. This is the classic teaching point: genu = corticobulbar, posterior limb = corticospinal (upper limb anterior, lower limb posterior). The retrolenticular part carries visual radiation (optic radiation) and corticotectal fibres. The anterior limb carries frontopontine and thalamocortical fibres.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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