biology

Low anterior hairline

Low anterior hairline 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 Low anterior hairline rather than just read about it. In short: Low anterior hairline is a dysmorphic feature in which the frontal hairline which defines the top and sides of the forehead is unusually low. This can mean that either the distance between the trichion (hairline) and glabella at the midline is more than 2 standard deviations below the mean, or that this distance is apparently (subjectively) decreased.

Key takeaways

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

Reference excerpt

Low anterior hairline is a dysmorphic feature in which the frontal hairline which defines the top and sides of the forehead is unusually low. This can mean that either the distance between the trichion (hairline) and glabella at the midline is more than 2 standard deviations below the mean, or that this distance is apparently (subjectively) decreased.

Conditions Low anterior hairline is seen in the following conditions and syndromes:

8q22.1 microdeletion syndrome Adams-Oliver syndrome 2 Agenesis of the corpus callosum with peripheral neuropathy ALG11-congenital disorder of glycosylation Barber-Say syndrome Blepharophimosis - intellectual disability syndrome, Verloes type Bohring-Opitz syndrome Cataract - congenital heart disease - neural tube defect syndrome Cerebellar atrophy, visual impairment, and psychomotor retardation Coffin-Siris syndrome 5 and 12 COG7 congenital disorder of glycosylation Congenital lactic acidosis, Saguenay-Lac-Saint-Jean type Cornelia de Lange syndrome 3 and 5 Craniosynostosis 6 Deficiency of alpha-mannosidase Deletion of long arm of chromosome 18 DOORS syndrome Dysmorphism-conductive hearing loss-heart defect syndrome Ectodermal dysplasia 13, hair/tooth type Fanconi anemia, complementation group S Focal facial dermal dysplasia type III Fontaine progeroid syndrome Hereditary spastic paraplegia 49 Intellectual disability, autosomal dominant 14, 42, and 52 KBG syndrome Lissencephaly 7 with cerebellar hypoplasia Megalocornea-intellectual disability syndrome MEGF8-related Carpenter syndrome Microcephaly, short stature, and impaired glucose metabolism 1 Muenke syndrome Nicolaides-Baraitser syndrome Pontocerebellar hypoplasia, IIA 17 Rubinstein-Taybi syndrome due to CREBBP mutations

Saethre-Chotzen syndrome SCARF syndrome Skin creases, congenital symmetric circumferential, 2 Spondyloepimetaphyseal dysplasia, Bieganski type Spondyloepimetaphyseal dysplasia, Genevieve type TCF12-related craniosynostosis Vertebral anomalies and variable endocrine and T-cell dysfunction Warburg Micro syndrome 2, 3, and 4 Zimmermann-Laband syndrome 1 and 3

Illustrations

Worked examples

Example 1 — a first encounter with Low anterior hairline

Start with the simplest possible case. Write down what Low anterior hairline 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 Low anterior hairline 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 Low anterior hairline 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 Low anterior hairline

In research: Low anterior hairline 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 Low anterior hairline 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: Low anterior hairline is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomical pathology, Face, Hair, so understanding it makes those chapters shorter.
In everyday life: Look for Low anterior hairline 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 Low anterior hairline in 20 minutes

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

Frequently asked questions

What is Low anterior hairline in simple terms?

Why does Low anterior hairline 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 Low anterior hairline?

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 Low anterior hairline.