An evidence-based definition: a bulging (rather than fully herniated) intervertebral disc occurs when the annulus fibrosus (the tough outer ring) at the C6–C7 ...

A cervical intervertebral disc bulge between C5–C6 occurs when the outer layer of the disc (the annulus fibrosus) weakens and protrudes beyond its normal ...

A cervical intervertebral disc bulge at the C4–C5 level occurs when the fibrous outer ring of the disc (annulus fibrosus) between the fourth and fifth cervical ...

A cervical intervertebral disc bulge at the C3–C4 level occurs when the soft, jelly-like center (nucleus pulposus) of the disc between the third and fourth ...

A cervical intervertebral disc bulge at C2–C3 occurs when the tough outer layer of the disc (the annulus fibrosus) weakens and the inner gel-like core (the ...

A cervical intervertebral disc bulge occurs when the outer fibrous ring (annulus fibrosus) of one of the six cervical discs (located between C2–C3 through ...

Prolapse of the cervical intervertebral disc (often called cervical disc herniation or cervical disc prolapse) occurs when the soft, gel-like center of a ...

A cyst in the occipitalis muscle is a fluid-filled sac that arises within or adjacent to the thin, quadrilateral muscle at the back of the scalp. These cysts ...

Tumors of the occipitalis muscle are rare growths that arise from the muscle fibers or surrounding soft tissues at the back of the scalp. Because the ...

The occipitalis muscle is a thin, flat muscle located at the back of the head. When this muscle becomes irritated or injured, it can cause persistent pain, ...

An occipitalis muscle spasm is an involuntary, often sudden contraction of the occipitalis muscle at the back of the scalp. This spasm can feel like a brief ...

The occipitalis muscle, also known as the occipital belly of the epicranius (or occipitofrontalis) muscle, lies at the back of the head and plays a key role in ...

The occipitalis muscle is a thin, quadrilateral muscle that forms the posterior part of the epicranius (also known as the occipitofrontalis). It lies just ...

A frontalis muscle contracture is a condition in which the forehead’s primary muscle—the frontalis—becomes permanently shortened or stiffened, leading to ...

Frontalis Muscle Dystrophy is a condition characterized by the gradual weakening and degeneration of the frontalis muscle, which covers the forehead and helps ...

Frontalis muscle dystonia is a type of focal cranial dystonia characterized by sustained or intermittent involuntary contractions of the frontalis muscle, ...

A frontalis muscle strain is an injury to the thin sheet of muscle fibers at the front of the forehead. This muscle, called the frontalis, helps you raise your ...

A frontalis muscle sprain—often called a frontalis strain—occurs when the thin, quadrilateral forehead muscle is overstretched or torn. Although “sprain” ...

A frontalis muscle tear—sometimes called a forehead muscle strain—is an injury to the thin, quadrilateral muscle that spans the forehead. Though rare compared ...

A frontalis muscle injury occurs when the thin, quadrilateral muscle covering your forehead becomes damaged—through overstretching, tearing, compression, or ...