General Features

Forward Head Posture Fix

Forward Head Posture Fix

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The neck can be divided into two compartments: an anterior or visceral part containing the hyoid bone, pharynx, esophagus, larynx, and associated cartilages, and a posterior or vertebral compartment consisting mostly of muscles associated with cervical vertebrae and the ventral rami of the cervical plexus and brachial plexus. Both compartments are partially covered by two superficial muscles, the trapezius and the sternocleidomastoid, which serve to divide each side of the neck into anterior and posterior triangles (Figure III-6-1).

Posterior triangle

Sternocleidomastoid muscle

Accessory nerve (XI)

Trapezius muscle

Middle scalene muscle

Figure 111-6-1.Triangles of the Neck

Posterior triangle

Sternocleidomastoid muscle

Accessory nerve (XI)

Trapezius muscle

External jugular vein

Middle scalene muscle

Clavicle

Anterior triangle

Submandibular gland Digastric muscle Mylohyoid muscle Stylohyoid muscle Hyoid bone Internal jugular vein Thyrohyoid muscle Sternothyroid muscle Sternohyoid muscle Omohyoid muscle Thyroid gland

Figure 111-6-1.Triangles of the Neck

Also in the posterior triangle are the phrenic nerve {formed from the ventral rami of cervical spinal segments C3, CA, and C5), which lies on the anterior surface of the anterior scalene muscle.

In the posterior triangle cutaneous branches of the cervical plexus (great auricular, lesser occipital, transverse cervical, and supraclavicular nerves) emerge at the midpoint of the sternocleidomastoid muscle. These nerves supply the skin of the neck and posterior scalp.

In the superior part of the scalene interval, the upper trunk of the brachial plexus may be compressed, causing weakness of shoulder and arm muscles. In the inferior part of the interval, the lower trunk of die plexus may be compressed by a cervical rib or an apical lung (Pancoast) tumor, causing sensory deficits and weakness of muscles in the hand.

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