# Muscles

The muscular system is the roughly 600 named skeletal muscles that pull on bones to produce movement, plus the smooth muscle of the organs and the cardiac muscle of the heart.

## About muscles

Gray's Anatomy (1918) groups the skeletal muscles by region — muscles of the head, neck, trunk, upper limb, and lower limb — and names each one by its shape, location, or action.

## Questions

### What is the biceps called?

A two-headed muscle on the front of the upper arm.

### What is the triceps called?

A three-headed muscle on the back of the upper arm.

### What is the deltoid?

A thick, triangular muscle that caps the shoulder.

### What is the chest muscle called?

A large, fan-shaped muscle covering the front of the upper chest.

### What are the lats called?

A broad, flat, triangular muscle of the back.

## Sources

- [Gray's Anatomy of the Human Body (1918)](https://www.bartleby.com/107/)

---
Canonical: https://bestanatomyanswers.com/library/muscles
Author: Best Anatomy Answers — https://bestanatomyanswers.com
Publisher: Best Anatomy Answers
Published: 2026-07-18T00:00:00+00:00
Modified: 2026-07-18T00:00:00+00:00
Last verified: 2026-07-18
License: Citation License 1.0 — https://bestexpertanswers.com/license
© Adolicious LLC