Question

Which midbrain region contains motor axons from the primary motor cortex to the spinal cord?

Answer 1

The cerebral peduncle is the midbrain region that contains motor axons from the primary motor cortex to the spinal cord.

Explain the anatomical understanding of the cerebral peduncle.

The cerebral peduncles are the anterior midbrain structures that link the rest of the brainstem to the thalami.

• They are joined by the interpeduncular cistern and house the vast white matter tracts that run to and from the cerebrum.
• Semilunar-shaped bundle of white matter fibres in the midbrain, containing the corticospinal tract (3/5 intermediates) and the corticopontine (fronto-pontine and temporo-pontine fibers).
• The substantia nigra is located posterior to the crus cerebri, followed by the mesencephalic tegmentum.

The midbrain is the smallest of the three brainstem sections, measuring around 2cm in length. The midbrain ascends through the aperture in the tentorium cerebelli.

It is broken into two major sections,

• The tectum is placed behind the cerebral aqueduct.

• Cerebral peduncles are paired and placed anteriorly and laterally.

Internally, the substania nigra divides the cerebral peduncles into the crus cerebri (anterior) and the tegmentum (posterior) (posterior).

Learn more about cerebral peduncles here,

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