science

Neck dissection

Neck dissection is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Neck dissection rather than just read about it. In short: The neck dissection is a surgical procedure for control of neck lymph node metastasis from squamous cell carcinoma (SCC) of the head and neck. The aim of the procedure is to remove lymph nodes from one side of the neck into which cancer cells may have migrated.

Key takeaways

Neck dissection belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Neck dissection to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Neck dissection from memory before moving on to harder problems.

Reference excerpt

The neck dissection is a surgical procedure for control of neck lymph node metastasis from squamous cell carcinoma (SCC) of the head and neck. The aim of the procedure is to remove lymph nodes from one side of the neck into which cancer cells may have migrated. Metastasis of squamous cell carcinoma into the lymph nodes of the neck reduce survival and is the most important factor in the spread of the disease. The metastases may originate from SCC of the upper aerodigestive tract, including the oral cavity, tongue, nasopharynx, oropharynx, hypopharynx, and larynx, as well as the thyroid, parotid and posterior scalp.

History of neck dissections 1906 – George W. Crile of the Cleveland Clinic describes the radical neck dissection. The operation encompasses removal of all the lymph nodes on one side of the neck, and includes removal of the spinal accessory nerve (SAN), internal jugular vein (IJV) and sternocleidomastoid muscle (SCM). 1957 – Hayes Martin describes routine use of the radical neck dissection for control of neck metastases. 1967 – Oscar Suarez and E. Bocca describe a more conservative operation that preserves SAN, IJV and SCM. Last 3 decades – Further operations have been described to selectively remove the involved regional lymph groups.

Division of the neck into levels and sublevels

To describe the lymph nodes of the neck for neck dissection, the neck is divided into 6 areas called Levels. The levels are identified by Roman numeral, increasing towards the chest. A further Level VII to denote lymph node groups in the superior mediastinum is no longer used. Instead, lymph nodes in other non-neck regions are referred to by the name of their specific nodal groups.

Level I – This includes the submental and submandibular lymph nodes. The submental triangle (sublevel IA) is bounded by the anterior belly of the digastric muscles (laterally) and the hyoid (inferiorly). The submandibular triangle (sublevel IB) is bounded by the body of the mandible (superiorly), the stylohyoid (posteriorly), and the anterior belly of the digastric (anteriorly). Level II – This includes lymph nodes of the upper jugular group and is divided into sublevels IIA and IIB. Level II is bounded by the inferior border of the hyoid (inferiorly), the base of skull (superiorly), the stylohyoid muscle (anteriorly) and the posterior border of the SCM (posteriorly). Sublevel IIA nodes lie anterior to the SAN. Sublevel IIB nodes lie posterior to the SAN. Level III – This includes lymph nodes of the middle jugular group. This level is bounded by the inferior border of the hyoid (superiorly) and the inferior border of the cricoid (inferiorly), the posterior border of the sternohyoid (anteriorly) and the posterior border of the SCM (posteriorly). Level IV – This includes lymph nodes of the lower jugular group. This level is bounded by the inferior border of the cricoid (superiorly), the clavicle / sternal notch (inferiorly), the posterior border of the sternohyoid (anteriorly) and the posterior border of the SCM (posteriorly). Level V – This includes posterior compartment lymph nodes. This compartment is bounded by the clavicle (inferiorly), the anterior border of the trapezius (posteriorly), the posterior border of the SCM (anteriorly). It is divided into sublevels VA (lying above a transverse plane marking the inferior border of the anterior cricoid arch) and VB (below the aforementioned plane). Level VI – This includes the anterior compartment lymph nodes. This compartment is bounded by the common carotid arteries (laterally), the hyoid (superiorly), the suprasternal notch (inferiorly).

Classification of neck dissections The 2001 revisions proposed by the American Head and Neck Society (AHNS) and the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) are as follows.

Radical Neck Dissection (RND) – removal of all ipsilateral cervical lymph node groups from levels I through V, together with SAN, SCM and IJV. Modified Radical Neck Dissection (MRND) – removal of all lymph node groups routinely removed in a RND, but with preservation of one or more nonlymphatic structures (SAN, SCM and IJV). Selective Neck Dissection (SND) (together with the use of parentheses to denote the levels or sublevels removed) – cervical lymphadenectomy with preservation of one or more lymph node groups that are routinely removed in a RND. Thus for oral cavity cancers, SND (I–III) is commonly performed. For oropharyngeal, hypopharyngeal and laryngeal cancers, SND (II–IV) is the procedure of choice. Extended Neck Dissection. This refers to removal of one or more additional lymph node groups or nonlymphatic structures, or both, not encompassed by the RND.

References

External links Patient Information for neck dissection at Georgetown Univ. Hospital Neck dissection: an operation in evolution in World Journal of Surgical Oncology eMedicine: Head and Neck Cancer: Resection and Neck Dissection eMedicine: Radical Neck Dissection

Illustrations

Worked examples

Example 1 — a first encounter with Neck dissection

Start with the simplest possible case. Write down what Neck dissection claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Neck dissection before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Neck dissection ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Neck dissection

In research: Neck dissection appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Neck dissection in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Neck dissection is common in secondary-school and first-year university syllabi. It links to neighbouring topics Oral and maxillofacial surgery, Otorhinolaryngology, Surgical oncology, so understanding it makes those chapters shorter.
In everyday life: Look for Neck dissection outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Neck dissection in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Neck dissection means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Neck dissection out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Neck dissection in simple terms?

Why does Neck dissection matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Neck dissection?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Neck dissection.