What are the main groups of muscles in the back of the neck?

The muscles are classified into two main groups: superficial and deep. The superficial group includes muscles like the trapezius, while the deep group comprises intrinsic muscles such as the splenius and semispinalis muscles.

What is the function of the trapezius muscle in the neck?

The trapezius supports head and neck posture and assists in scapular movements, such as elevating and retracting the scapula and steadying it during shoulder shrugging.

Which muscles are part of the deep group in the back of the neck?

The deep group consists of intrinsic muscles arranged in layers, including splenius capitis and cervicis, longissimus capitis and cervicis, semispinalis capitis and cervicis, and suboccipital muscles.

How do the splenius muscles contribute to neck movement?

The splenius capitis and cervicis muscles primarily enable rotation and extension, such as rotating the head to the same side and extending the head and neck when acting bilaterally.

What is a clinical correlation involving neck muscles?

In conditions like meningitis, neck rigidity can occur due to spasm of neck extensor muscles, caused by irritation of cervical nerve roots in the infected subarachnoid space.

What nerve supplies the trapezius muscle?

The trapezius is innervated by the spinal accessory nerve (CN XI) for motor functions, with sensory input from C3 and C4 spinal nerves.

How are the superficial muscles of the back of the neck organized?

The superficial group has two layers: the first layer includes only the trapezius muscle, and the second layer includes levator scapulae, rhomboideus minor, and rhomboideus major.

Posterior Neck Muscles – Superficial & Deep Groups

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