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Control and Co-ordination — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYControl and Co-ordination5 Marks
Question
Describe the structure and function of midbrain.
✓

Answer

1. Structure of midbrain:

  • Midbrain is the middle part of the brain situated between the forebrain and the hindbrain. It is present between the pons varolii and diencephalon.
  • It has two distinct regions : Corpora quadrigemina and crura cerebri.
  • Corpora quadrigemina consists of two pairs of lobes, viz., superior colliculi and inferior colliculi. These are located in the thick wall of midbrain.
  • Crura cerebri are thick bands of longitudinal nerve fibres, present on the floor of midbrain.

2. Functions of midbrain:

  • Inferior colliculi control and coordinate auditory reflexes.
  • Superior colliculi control head and eye movements.
  • Crura cerebri connect the cerebrum to cerebellum and spinal cord.

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