biology

Sulcus (morphology)

Sulcus (morphology) 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 Sulcus (morphology) rather than just read about it. In short: In biological morphology and anatomy, a sulcus (pl. sulci) is a furrow or fissure (Latin: fissura; pl. fissurae). It may be a groove, natural division, deep furrow, elongated cleft, or tear in the surface of a limb or an organ, most notably on the surface of the brain, but also in the lungs, certain muscles (including the heart), as well as in bones and elsewhere.

Key takeaways

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

Reference excerpt

In biological morphology and anatomy, a sulcus (pl. sulci) is a furrow or fissure (Latin: fissura; pl. fissurae). It may be a groove, natural division, deep furrow, elongated cleft, or tear in the surface of a limb or an organ, most notably on the surface of the brain, but also in the lungs, certain muscles (including the heart), as well as in bones and elsewhere. Many sulci are the product of a surface fold or junction, such as in the gums, where they fold around the neck of the tooth. In invertebrate zoology, a sulcus is a fold, groove, or boundary, especially at the edges of sclerites or between segments. In pollen, a grain that is grooved by a sulcus is termed sulcate.

Examples in anatomy

Liver Ligamentum teres hepatis fissure Ligamentum venosum fissure Portal fissure, found in the under-surface of the liver Transverse fissure of liver, found in the lower surface of the liver Umbilical fissure, found in front of the liver

Lung Azygos fissure, of right lung Horizontal fissure of right lung Oblique fissure, of the right and left lungs

Skull Auricular fissure, found in the temporal bone Petrotympanic fissure Pterygomaxillary fissure Sphenoidal fissure, separates the wings and the body of the sphenoid bone Superior orbital fissure

Other types anal fissure, a break or tear in the skin of the anal canal anterior interventricular sulcus calcaneal sulcus coronal sulcus femoral sulcus or intercondylar fossa of femur fissure (dentistry), a break in the tooth enamel fissure of the nipple, a condition that results from running, breastfeeding and other friction-causing exposures fissured tongue, a condition characterized by deep grooves (fissures) in the tongue gingival sulcus gluteal sulcus Henle's fissure, a fissure in the connective tissue between the muscle fibers of the heart interlabial sulci intermammary sulcus intertubercular sulcus, the groove between the lesser and greater tubercules of the humerus (bone of the upper arm) lacrimal sulcus (sulcus lacrimalis) malleolar sulcus palpebral fissure, separates the upper and lower eyelids patellar sulcus or intercondylar fossa of femur posterior interventricular sulcus preauricular sulcus radial sulcus (musculospiral groove) sagittal sulcus separatoral sulcus (depression behind the brow ridges of some primates) sigmoid sulcus skin fissure, a linear-like cleavage of skin, sometimes defined as extending into the dermis sulcus arteriæ vertebralis sulcus subtarsalis in the eyelid sulcus tubae auditivae tympanic sulcus urethral sulcus ventral median fissure, of the spinal cord

In neuroanatomy

Brain Broca's fissure: found in the third left frontal fold of the brain. Burdach's fissure: connects the brain's insula and the inner surface of the operculum. Calcarine sulcus or Calcerine fissure: extends from the occipital of the cerebrum to the occipital fissure. Callosomarginal fissure: found in the medial surface of the cerebrum. Central sulcus or Rolando's fissure: separates the brain's frontal and parietal lobes. Clevenger's fissure: found in the inferior temporal lobe of the brain Collateral fissure: found in the inferior surface of the cerebrum. Fissure of Bichat: found below the corpus callosum in the cerebellum of the brain. Lateral sulcus or Fissure of Sylvius: separates the frontal and parietal lobes of the brain from the temporal lobe. Hippocampal sulcus: a sulcus that extends from the brain's corpus callosum to the tip of the temporal lobe. Horizontal fissure or Transverse fissure: found between the cerebrum and the cerebellum. Note that a "transverse fissure" can also be found in the liver and lungs. Longitudinal fissure or Medial longitudinal fissure: which divides the cerebrum into the two hemispheres. Occipitoparietal fissure: found between the occipital and parietal lobes of the brain. Wernicke's fissure: separates the brain's temporal and parietal lobes from the occipital lobe. Zygal fissure: found in the cerebrum. In the brain, a sulcus is a groove formed in the stage of gyrification by the folding of the cortex. There are many sulci and gyri formed. A larger than usual sulcus may instead be called a fissure such as the longitudinal fissure that separates the two hemispheres.

Illustrations

Sulcus (morphology): Gingival sulcus at neck of mammalian tooth — Gingival sulcus at neck of mammalian tooth

Sulcus (morphology): Rotating image of human brain, illustrating the lateral sulcus in the brain — Rotating image of human brain, illustrating the lateral sulcus in the brain

Worked examples

Example 1 — a first encounter with Sulcus (morphology)

Start with the simplest possible case. Write down what Sulcus (morphology) 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 Sulcus (morphology) 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 Sulcus (morphology) 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 Sulcus (morphology)

In research: Sulcus (morphology) 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 Sulcus (morphology) 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: Sulcus (morphology) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomy, so understanding it makes those chapters shorter.
In everyday life: Look for Sulcus (morphology) 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 Sulcus (morphology) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sulcus (morphology) 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 Sulcus (morphology) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sulcus (morphology) in simple terms?

Why does Sulcus (morphology) 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 Sulcus (morphology)?

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 Sulcus (morphology).