Kenhub

Interactive online anatomy & histology learning platform used by millions of healthcare students and professionals worldwide. Learning is hard.
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And yes we know: Learning anatomy is really hard. But who says it also has to be time consuming and boring? Stop spending endless hours reading an anatomy atlas or textbooks. We have engineered dozens of engaging exercises to make learning anatomy faster, easier and more fun. https://www.kenhub.com/

05/10/2026

Dopamine is not the pleasure chemical. Block it and the wanting disappears, while the liking survives. It is the molecule that pushes you toward a reward rather than the one that enjoys it once you arrive.

📚 Go deeper on the major neurotransmitters, their functions and the disorders linked to them, with labelled illustrations, a video tutorial and quizzes: https://khub.me/wfgcas

02/10/2026

Quiz Time! 🤓☝️📚 “How many bones can you name in one minute?”

02/10/2026

A nerve impulse only travels one way, and it is not because the axon is built as a one-way street. It comes down to timing.

The moment an action potential passes a patch of membrane, the sodium channels there are left inactivated. For roughly 1 to 2 milliseconds that patch cannot fire again regardless of how strong the next stimulus is. This is the absolute refractory period, and since the membrane behind the impulse is locked out while the membrane ahead is still resting, the only available direction is forward. What follows is the relative refractory period, where the sodium channels have reset but potassium channels remain open and the membrane is hyperpolarised, so a second action potential is possible only with a suprathreshold stimulus.

Between them, these two phases also decide the maximum frequency at which a neuron can fire.

📚 Want the full picture? This guide breaks down both refractory phases and the channel states behind them, with labelled illustrations, a video tutorial and quizzes: https://khub.me/xsh8zt

01/10/2026

The moment when carpal tunnel is not fun for the median nerve

30/09/2026

See the full breakdown of study groups for anatomy, the evidence-based pros, the pitfalls, and the review group approach that works better: https://khub.me/3796gm

29/09/2026

The back of the shoulder is easier to remember if you build it on your own hand. Teres minor sits above, teres major below, the long head of triceps runs vertically between them, and the humerus forms the outer edge. The gaps left over are three named spaces, and each one transmits something you will be asked about.

The triangular space carries the circumflex scapular artery. The quadrangular space carries the axillary nerve along with the posterior circumflex humeral artery. The triceps hiatus, also called the triangular interval, carries the radial nerve and the profunda brachii artery.

The quadrangular space is the one worth knowing clinically, because the axillary nerve passing through it is exactly why that nerve is at risk in a shoulder dislocation or a fracture of the surgical neck of the humerus.

📚 Want the spaces and their contents properly mapped out? This guide covers the fascias and spaces of the shoulder girdle with labelled illustrations and quizzes: https://khub.me/1iqsfb

23/09/2026

To learn more about all facial muscles, check out this free study guide article: https://khub.me/esk0cp

21/09/2026

Every neuron carries a signal. What changes from one to the next is the shape, and the shape tells you what that cell does and where in the nervous system it sits.

There are five classic types. Unipolar neurons have a single process doing all the work, and they're essentially an invertebrate design. Bipolar neurons have one dendrite in and one axon out, with the soma sitting right in the middle of the signal path, which is what you find in the retina, the olfactory epithelium and the cochlear and vestibular ganglia. Pseudounipolar neurons send out one process that immediately splits into a peripheral and a central branch, leaving the cell body off to the side so the signal bypasses it. Those are the cells of your dorsal root ganglia, carrying touch, pain, temperature and proprioception.

Multipolar neurons, one axon and many dendrites, are by far the most common. Their dendritic trees are wide enough to collect thousands of synapses, and they include the cortical pyramidal cells, cerebellar Purkinje cells, motor neurons and interneurons that do the actual integrating. Anaxonic neurons are the outliers, with processes so alike you cannot tell the axon from the dendrites, and they mostly work on graded potentials instead of firing action potentials.

One worth remembering for exams: when a text labels human sensory ganglion cells "unipolar", what it usually means is pseudounipolar.

📚 Want all five laid out properly? This guide covers the structure, location and function of each type, with labelled illustrations, a video tutorial and quizzes to test yourself: https://khub.me/7z3brq

15/09/2026

Add a little color to the anatomy of the spine and things become clearer.

To learn everything about the vertebral column, check out this free article study guide: https://khub.me/ybmxli

10/09/2026

Do study groups actually help you learn anatomy, or just help you feel like you're learning? 🤔

It's a fair debate. Studying with others lets you ask questions on the spot, split the workload, and test each other out loud. But research also points to real downsides, like collaborative inhibition and the very high chance your session quietly turns into a social hangout. The honest answer is: it depends. And there's a smarter middle ground, where everyone studies alone first and then meets to review and quiz each other.

📚 See the full breakdown of study groups for anatomy, the evidence-based pros, the hidden pitfalls, and the "review group" approach that works better: https://khub.me/mt7okh

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