biology

Palmaris profundus muscle

Palmaris profundus 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 Palmaris profundus muscle rather than just read about it. In short: Palmaris profundus (also known as musculus comitans nervi mediani or palmaris bitendinous) is a rare anatomical variant in the anterior compartment of forearm. It was first described in 1908.

Key takeaways

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

Reference excerpt

Palmaris profundus (also known as musculus comitans nervi mediani or palmaris bitendinous) is a rare anatomical variant in the anterior compartment of forearm. It was first described in 1908. It is usually found incidentally in cadaveric dissection or surgery.

Structure Pirola et al. classified the muscle into subtypes depending on its origin: (1) from the radius, (2) from the flexor digitorum superficialis fascia, and (3) from the ulna. Though, other origins of the muscle were reported including the medial epicondyle of humerus, the palmaris longus and the flexor pollicis longus. It runs deep to the pronator teres and lateral to the flexor digitorum superficialis. Its tendon passes beneath the flexor retinaculum through the carpal tunnel before broadening out to insert to the deep part of palmar aponeurosis. In many cases, the muscle is contained within the same fascial sheath as the median nerve. To indicate this association, the term musculus comitans nervi mediani is often used. It can also be referred to as the palmaris bitendinosus when originating from the palmaris longus. It can be considered a variation of the palmaris longus, however, it may exist in addition to the palmaris longus. If both of them coexist, the aberrant palmaris profundus tends to be the deeper one. Nerve supply to the palmaris profundus varies. Innervations by the median nerve, anterior interosseous nerve or the ulnar nerve were reported. Function of the palmaris profundus is similar to the palmaris longus. It is a flexor of the wrist.

Clinical significance The presence of the palmaris profundus is often associated with median nerve compression and carpal tunnel syndrome as available space for the median nerve decreases due to the presence of an additional tendon. It may also complicate the surgical release of the carpal tunnel. It may compress the anterior interosseous nerve, a motor branch of the median nerve, causing a condition called anterior interosseous nerve syndrome.

See also Palmaris longus muscle List of anatomical variations Anterior compartment of forearm

References

Illustrations

Worked examples

Example 1 — a first encounter with Palmaris profundus muscle

Start with the simplest possible case. Write down what Palmaris profundus 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 Palmaris profundus 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 Palmaris profundus 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 Palmaris profundus muscle

In research: Palmaris profundus 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 Palmaris profundus 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: Palmaris profundus 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 Palmaris profundus 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 Palmaris profundus muscle in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Palmaris profundus muscle 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.
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Frequently asked questions

What is Palmaris profundus muscle in simple terms?

Palmaris profundus (also known as musculus comitans nervi mediani or palmaris bitendinous) is a rare anatomical variant in the anterior compartment of forearm. It was first described in 1908.

Why does Palmaris profundus 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 Palmaris profundus 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 Palmaris profundus muscle.