All articles starting with F

Femoral nerve

The femoral nerve is a large lower limb nerve arising from the L2, L3, and L4 lumbar plexus roots and supplying the anterior thigh muscles.

Femoral triangle (Scarpa's triangle, trigonum femorale): wedge-shaped space in the superomedial thigh bounded by inguinal ligament, sartorius, and adductor longus; contains femoral nerve, artery, vein, canal (NAVEL); site for pulse, vascular access, hernias.

Femoral vein

Femoral vein (vena femoralis), formerly misnamed superficial femoral vein: the deep thigh vein continuing the popliteal vein through the adductor hiatus to become the external iliac vein; drains the lower limb, has one to six valves, and is a standard catheter access site.

Femoral-facial syndrome

Femoral-facial syndrome, also called femoral hypoplasia-unusual facies syndrome, is a rare congenital disorder combining underdeveloped or absent femurs with distinctive facial features, often linked to maternal diabetes.

Femoroacetabular impingement

Femoroacetabular impingement (FAI, FAI syndrome): hip condition with cam, pincer, or combined extra bone causing abnormal joint contact, pain, labral and cartilage damage, and early osteoarthritis risk.

Femoropopliteal bypass

Femoropopliteal bypass is a vascular operation that restores blood flow to the leg by grafting a conduit, preferably the great saphenous vein, around blocked arteries.

Femosphere

Femosphere: term coined by Jilly Boyce Kay (Loughborough University) for online female-centric communities mirroring the manosphere, including femcels, female dating strategists, and pink-pill ideology; also an older US usage and a women's blog name.

Oct 10, 2026

Femsa

Femsa is a Monterrey-based Mexican multinational operating Coca-Cola bottling across Latin America and the OXXO store chain, tracing its origins to an 1890 brewery in Monterrey.

Femtanyl

Femtanyl is a Canadian musical duo consisting of Noelle Stockwood and Juno Callender. They are known for their aggressive blend of digital hardcore and breakcore-influenced rave.

Femto-

Femto- is an SI prefix denoting 10 to the −15, one quadrillionth, with the symbol f, adopted in 1964 and used in units like the femtosecond and femtometer.

Oct 22, 2026

Femto-photography

Femto-photography is an ultrafast imaging technique developed at MIT that captures movies of laser pulses traveling through a scene, at about half a trillion frames per second.

FEMTO-ST

FEMTO-ST is a French multidisciplinary research institute for engineering sciences and information technologies, created in 2004 and run jointly by CNRS and the University of Franche-Comté.

Femtochemistry

Femtochemistry is the study of chemical bond making and breaking on the femtosecond timescale, established by Ahmed Zewail, who won the 1999 Nobel Prize in Chemistry.

Femtosecond

A femtosecond (fs) is a unit of time equal to one quadrillionth of a second, the timescale of molecular vibrations and chemical bond making and breaking.

Femtosecond crystallography

Femtosecond crystallography, practiced as serial femtosecond crystallography (SFX), determines atomic structures of protein microcrystals from femtosecond X-ray free-electron laser snapshots, merging thousands of still images taken before each crystal is destroyed.

Femtosecond laser ablation

Femtosecond laser ablation is a machining method using laser pulses shorter than a picosecond to vaporize material with minimal heat damage, used on stents, smartphone glass, and solar cells.

Oct 22, 2026

Femtosecond laser writing of optical waveguides in diamond

Femtosecond laser writing of optical waveguides in diamond is a fabrication technique that uses focused femtosecond laser pulses to create buried, light-guiding paths inside diamond without etching.

Oct 22, 2026

Femtosecond laser-driven ultrafast magnetization dynamics in antiferromagnets

Femtosecond laser-driven ultrafast magnetization dynamics in antiferromagnets is the study of how the staggered magnetic order of antiferromagnets responds to ultrashort light pulses, a field grown from femtomagnetism since 1996.

Femtosecond stimulated Raman spectroscopy

Femtosecond stimulated Raman spectroscopy (FSRS) is a three-pulse ultrafast technique recording time-resolved vibrational Raman spectra of photoexcited molecules, combining femtosecond time resolution with spectral resolution below 10 cm⁻¹.

Femur

Femur (thigh bone, os femoris): the longest, heaviest, strongest human bone, running hip to knee; ~128-degree neck-shaft angle, endochondral ossification from week 7, over 300,000 US hip fractures yearly.

Femur-fibula-ulna complex

Femur-fibula-ulna complex (FFU complex, femur-fibula-ulna syndrome, OMIM 228200) is a rare, sporadic, non-lethal congenital limb malformation with asymmetric hypoplasia or absence of the femur, fibula, and/or ulna; right side and upper limbs more often affected.

Fen

A fen is a peat-forming wetland fed by groundwater and mineral soil drainage rather than rain, making it less acidic and more nutrient-rich than a bog.

Oct 20, 2026

FEN 560

FEN 560 is the EU code for fenugreek seed powder (Trigonella foenum-graecum), a plant protection active substance approved only as an elicitor of crop self-defence mechanisms, included in Annex I of Directive 91/414/EEC from 1 November 2010.

Fen Causeway

Fen Causeway, or Fen Road (Margary 25), a Roman gravel causeway road across the East Anglian Fens from Denver, Norfolk to Durobrivae (Water Newton) near Peterborough, built in the late 1st century AD over the earlier Bronze Age Flag Fen causeway route.

Sep 19, 2026

Fen TV

Fen TV (Фен ТВ) is a Bulgarian music television channel based in Sofia that has broadcast pop-folk, folklore, and Balkan music 24 hours a day since 2003.

Sep 21, 2026

Fen‐Biao Gao

Fen-Biao Gao is a neuroscientist who is Professor of RNA Therapeutics and founding director of the Frontotemporal Dementia Research Center at UMass Chan Medical School, studying frontotemporal dementia and ALS.

Fena: Pirate Princess (賊王女)

Fena: Pirate Princess (海賊王女, Kaizoku Ōjo) is a 2021 original 12-episode anime by Production I.G, directed by Kazuto Nakazawa with music by Yuki Kajiura, co-produced by Crunchyroll and Adult Swim; orphan Fena Houtman voyages with samurai to solve the mystery of "Eden."