The protrusion of a part of a structure through the tissues normally containing it the term describes a stiff neck due too a spasmodic contraction of the neck muscles that pull the head toward the affected side.

1. Hernia

2. Spasmodic torticollis (wryneck)

Explanation:

Hernia refers to the condition wherein a body part or organ protrudes out abnormally. For example, a physical trauma sometimes causes herniation of intervertebral discs wherein the rupture of annulus fibrosis results in protrusion of the spongy nucleus pulposus through the annulus. The condition is also called a slipped disc.

Spasmodic torticollis or wryneck refers to the condition involving twisting of neck and tilt of head towards one site. It occurs when the sternocleidomastoid muscle on one side is damaged or injured. For example, during parturition, these muscle fibers are sometimes torn leading to wryneck.

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