hatching gland in dogs

The cells of the hatching gland contain enzymes responsible for solubilization of the egg chorion, facilitating the hatching process[GO]. A transversely oriented set of cells located deep to the EVL on the pericardial membrane, especially prominent during pharyngula period because of the brightly refractile cytoplasmic granules (containing hatching enzymes) of the principal cells of the gland. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the hatching gland is

The cells of the hatching gland contain enzymes responsible for solubilization of the egg chorion, facilitating the hatching process[GO]. A transversely oriented set of cells located deep to the EVL on the pericardial membrane, especially prominent during pharyngula period because of the brightly refractile cytoplasmic granules (containing hatching enzymes) of the principal cells of the gland. The atlas records it as a gland at the organ scale in the dog.

Where the hatching gland is

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What the hatching gland connects to

The atlas records 3 typed relationships for it, across 2 kinds of connection. part of ectoderm and embryo.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the hatching gland. 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 frontal gland and hgg. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002538, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

Questions

Where is the hatching gland?

This dataset records no region or system for it. No positional evidence of any kind. Drawn outside the body so it can still be found and counted, never inside it.

What does the hatching gland connect to?

Part of: ectoderm and embryo.

Is the hatching gland 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.