pectoralis major in dogs

The pectoralis major is a thick, fan-shaped muscle, situated at the upper front of the chest wall. It makes up the bulk of the chest muscles in the male and lies under the breast in the female. Underneath the pectoralis major is the pectoralis minor, a thin, triangular muscle. [WP,unvetted]. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the pectoralis major is

The pectoralis major is a thick, fan-shaped muscle, situated at the upper front of the chest wall. It makes up the bulk of the chest muscles in the male and lies under the breast in the female. Underneath the pectoralis major is the pectoralis minor, a thin, triangular muscle. [WP,unvetted]. The atlas records it as a muscle at the organ scale in the dog.

Where the pectoralis major is

It sits in the thorax and trunk, within the muscular system. Only the region is known. The position shown is somewhere plausible inside it and nothing more.

What the pectoralis major connects to

The atlas records 5 typed relationships for it, across 3 kinds of connection. a kind of muscle of shoulder and pectoral muscle.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the pectoralis major. 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 pectoralis major muscle, pectoralis major muscle structure and musculus pectoralis major. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0002381, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• A kind of: muscle of shoulder and pectoral muscle.
• originates from: clavicle bone and sternum.
• inserts into: humerus.

Questions

Where is the pectoralis major?

It sits in the thorax and trunk, within the muscular system. Only the region is known. The position shown is somewhere plausible inside it and nothing more.

What does the pectoralis major connect to?

A kind of: muscle of shoulder and pectoral muscle.

Is the pectoralis major 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.