Shoulder Muscles

The cat has three shoulder muscles, the deltoid group, homologous to the one deltoid muscle of the human. The three deltoid muscles of the cat are the clavodeltoid, acromiodeltoid, and the spinodeltoid.

The clavodeltoid inserts on the proximal end of the ulna of the cat. None of the fibers of the human deltoid muscle insert on the ulna. The clavodeltoid joins with the clavotrapezius. The clavodeltoid is also called the clavobrachialis.

The acromiodeltoid is a small muscle lying between the clavodeltoid and the spinodeltoid. The latter has its origin on the spine of the scapula.

Remember that these three deltoid muscles in the cat are homologues of the single deltoid muscle in the shoulder of the human.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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