biology

Levator claviculae muscle

Levator claviculae muscle is a biology 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 Levator claviculae muscle rather than just read about it. In short: In human anatomy, the levator claviculae is a very rare accessory and vestigial skeletal muscle in the posterior triangle of the neck. It originates on the transverse processes of the upper cervical vertebrae and is inserted in the lateral half of the clavicle.

Key takeaways

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Learn the definition first, then one example that makes the definition concrete.
Connect Levator claviculae muscle to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Levator claviculae muscle from memory before moving on to harder problems.

Reference excerpt

In human anatomy, the levator claviculae is a very rare accessory and vestigial skeletal muscle in the posterior triangle of the neck. It originates on the transverse processes of the upper cervical vertebrae and is inserted in the lateral half of the clavicle. Though a supernumerary muscle present in only 2–3% of all people, it is not an abnormality but a variant of normal human anatomy with an atavistic character. It has also been referred to as the omocervicalis, cleidocervicalis, and tracheloacromial muscle, with the variation in names indicating different sites of origin and insertion.

Structure Its origin is on at least the third uppermost vertebrae, from where it courses inferiorly and laterally, lateral to the scalene and levator scapulae muscles but medial to the sternocleidomastoid muscle. Passing posteriorly to the latter muscle, it is inserted either to the middle of the clavicle or, more frequently, to the lateral third of the clavicle. It might also blend with the trapezius before its insertion. It has been reported to originate on the sixth cervical vertebra.

Variation The levator claviculae is an infrequently recognized anatomical variant in humans, distinguished from, for example, cervical adenopathy or a thrombosed vein, but a normal muscle in lower mammals and anthropoids. In humans, when present, it often appears unilaterally, most commonly on the left side, or bilaterally.

The embryologic origin of the muscle is controversial and subject to numerous hypotheses. It has been proposed to originate from several neighbouring muscles, including the sternocleidomastoid, the trapezius, the scalenus anterior, and the longus colli, but is possibly derived from an additional segmentation of the ventrolateral muscle primordia of the neck. Uncommon in human anatomy, the levator claviculae is nearly always present in most other mammals — including gibbons, orangutans, and chimpanzees. There are yet no phylogenetic explanations for its absence in humans.

History

The first documented observation of the levator claviculae occurs in an anatomical drawing by Leonardo da Vinci, but the first documented case was not reported until 1813. Darwin briefly described the muscle as an example of many muscles "found in all kinds of apes" but rare in humans. About the same time, Huxley and Wood reported the muscle has a predominantly unilateral occurrence. Since then only a dozen cases have been reported and the traditional 2–3% ratio, attributed to Wood, is possibly an overestimation not clearly corroborated by recent research.

German anatomist Robert Wiedersheim included it in his list of 86 vestigial organs.

References

Books

Worked examples

Example 1 — a first encounter with Levator claviculae muscle

Start with the simplest possible case. Write down what Levator claviculae muscle claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Levator claviculae muscle 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 Levator claviculae muscle 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 Levator claviculae muscle

In research: Levator claviculae muscle appears in biology 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 Levator claviculae muscle 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: Levator claviculae muscle is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomical variations, Muscles of the upper limb, so understanding it makes those chapters shorter.
In everyday life: Look for Levator claviculae muscle 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.

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How to study Levator claviculae muscle in 20 minutes

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Frequently asked questions

What is Levator claviculae muscle in simple terms?

Why does Levator claviculae muscle matter?

Because it connects several biology 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 Levator claviculae muscle?

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 Levator claviculae muscle.