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Torso Muscles

Extrinsic Back Muscles – Functional Anatomy

Overview Origin posterior axial skeleton Insertion scapula upper humerus Function retract the scapula depress & elevate the scapula Rotate the scapula upward and downward assists in labored breathing Innervation posterior rami spinal accessory nerve Labored Breathing In labored breathing, extrinsic back muscles stabilize and retract the scapula. This allows the deep extrinsic chest muscles to …

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Trapezius – Functional Anatomy

Overview Trapezius anatomy is complex. The trapezius is a broad, flat muscle covering the upper back. It is named for the trapezoid shape that these paired muscles create. It has three major sections that originate on the axial skeleton and insert on the pectoral girdle, making it an extrinsic back muscle. Each of its sections …

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Rhomboid Major and Minor Muscles – Functional Anatomy

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Extrinsic Chest Muscles – Functional Anatomy

The anatomy of the extrinsic chest muscles is more complicated than the first glance suggests. They originate on the front of the axial skeleton and insert on the upper extremity. Generally speaking, they protract the scapula and draw the humerus toward the midline. This arrangement gets a little more complicated with the pectoralis major. The …

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Subclavius- Functional Anatomy

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Serratus Anterior – Functional Anatomy

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Pectoralis Minor – Functional Anatomy

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Pectoralis Major – Functional Anatomy

Here, you will find the anatomy of the pectoralis major, including functional considerations, variations and links to related posts. Overview The Pectoralis major is a large, flat muscle on the anterior thorax. It originates on the anterior axial skeleton. Then, with a twist, it inserts on the proximal humerus. Origin Insertion Function Nerve The extensive …

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