central gray substance of midbrain in dogs

Periaqueductal gray (PAG; also called the 'central gray') is the gray matter located around the cerebral aqueduct within the midbrain. It plays a role in the descending modulation of pain and in defensive behaviour. The ascending pain and temperature fibers of the spinothalamic tract also send information to the PAG via the spinomesencephalic tract. The spinomesencephalic tract is so-named because the fibers originate in the spine and terminate in the mesencephalon, another name for the midbrain, the part of the brain in which the PAG resides. [WP,unvetted]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the central gray substance of midbrain is

Periaqueductal gray (PAG; also called the 'central gray') is the gray matter located around the cerebral aqueduct within the midbrain. It plays a role in the descending modulation of pain and in defensive behaviour. The ascending pain and temperature fibers of the spinothalamic tract also send information to the PAG via the spinomesencephalic tract. The spinomesencephalic tract is so-named because the fibers originate in the spine and terminate in the mesencephalon, another name for the midbrain, the part of the brain in which the PAG resides. [WP,unvetted]. The atlas records it as a nerve at the organ scale in the dog.

Where the central gray substance of midbrain is

It sits within the nervous system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What the central gray substance of midbrain connects to

The atlas records 4 typed relationships for it, across 2 kinds of connection. part of midbrain and midbrain tegmentum.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the central gray substance of midbrain. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as CGMB, griseum centrale, substantia grisea centralis, anulus of cerebral aqueduct, central (periaqueductal) gray and midbrain periaqueductal grey, and 20 more. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0003040, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Questions

Where is the central gray substance of midbrain?

It sits within the nervous system. Not positioned individually. Drawn inside the structure this dataset says contains it — the containment is asserted, the exact spot within it is not.

What does the central gray substance of midbrain connect to?

Part of: midbrain and midbrain tegmentum.

Is the central gray substance of midbrain the same in other species?

This page describes the dog. The human record of the same structure sits beside it on /compare, over one shared model rather than two atlases built separately.