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Neck Muscles

Sternocleidomastoid – Functional Anatomy

Sternocleidomastoid Anatomy. The sternocleidomastoid is a two-headed muscle that extends obliquely along the lateral neck. Origin: The sternal head attaches to the superior aspect of the manubrium. The clavicular head attaches to the medial third of the clavicle. Insertion: Both heads merge and attach to the mastoid process of the temporal bone and lateral third …

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Splenius Cervicis – Functional Anatomy

This is a broad, flat muscle that wraps around the lateral neck. It anchors in the upper thoracic vertebrae and inserts on the upper cervical vertebrae. This makes it a “jack of all trades, master of none,” as it assists in extension, rotation, side-bending, and strapping things down. Origin spinous processes of T3-T6 Insertion anterior …

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Splenius Capitis – Functional Anatomy

Overview Splenius capitis is a broad, flat sheet that originates along the mid-line of the neck’s base. It wraps the lateral muscles and inserts onto the lateral base of the skull. Its relationship with the splenius cervicis complicates the anatomy. Origin midline fascia over the ligamentum nuchae from C3 – C7 the spinous processes of …

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Thoracic Outlet – Functional Anatomy

The anatomy of thoracic outlet structures is complex in several ways. First, many of the bones are both origin and insertion for muscles. Second, several of the muscles have statistically significant variations in cadaver studies. Here, you will find a brief overview of Thoracic Outlet Syndrome followed by a walk-through of the structures from back …

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Scalene Muscles – Functional Anatomy

Scalenes are 3 (sometimes 4) muscles on either side of the neck. The three bellies are named for their position; scalenus anterior, scalenus medius, scalenus posterior. The anomalous belly is called scalenus minimus.They are lateral cervical muscles that connect the cervical vertebrae to the upper thoracic cage. They are long muscles with fibers of uneven …

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Semispinalis Capitis – Functional Anatomy

The anatomy of the semispinalis capitis is significant for managing pain. It is a large muscle that extends the head, perpetuates forward head posture and squeezes the greater occipital nerve. Origin transverse processes of T1-T6 and the articular processes of C4-C7 Insertion between the superior and inferior nuchal ridges of the occipital ridge Function extension and …

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