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- Object recognition (cognitive science)Ability to identify objects
- Obligate nasal breathingInstinct to breathe through the nose rather than the mouth
- Oblique dendriteType of extensions of neurons
- Obstructive sleep apneaUpper airway closure disrupting sleep
- Obturator membraneThe obturator membrane is a thin fibrous sheet, which almost completely closes the obturat
- Obturator nerveNerve in human anatomy
- Occipital arteryThe occipital artery is a branch of the external carotid artery that provides arterial sup
- Occipital boneBone of the neurocranium
- Occipital gyriThree parallel gyri of the occipital lobe of the brain
- Occupational burnoutType of occupational stress
- Occupational cardiovascular diseaseMedical condition
- Occupational stressTensions related to work
- Ocular dominance columnOcular dominance columns are stripes of neurons in the visual cortex of certain mammals (i
- Oculocardiac reflexPulse rate connected with eye muscles
- Oculomotor nerveCranial nerve III, for eye movements
- Oddball paradigmPsychology research paradigm
- Odor detection thresholdThe odor detection threshold is the lowest concentration of a certain odor compound that i
- Oestrus (fly)Oestrus is a genus of bot flies, from the family Oestridae
- Oil Red OOil Red O (Solvent Red 27, Sudan Red 5B, C.I. 26125, C26H24N4O) is a lysochrome (fat-solub
- OlecranonCurved bony eminence of the ulna; forms the pointed part of the elbow
- OlfactometerInstrument used to detect and measure odor dilution
- Olfactory bulbNeural structure
- Olfactory ensheathing cellType of macroglia that ensheath unmyelinated olfactory neurons
- Olfactory epitheliumSpecialised epithelial tissue in the nasal cavity that detects odours
- Olfactory nerveCranial nerve I, for smelling
- Olfactory receptor neuronSensory neuron that detects odorants
- OligodendrocyteNeural cell type
- Oligodendrocyte progenitor cellSubtype of glial cell in the central nervous system
- Omohyoid muscleThe omohyoid muscle is a muscle in the neck. It is one of the infrahyoid muscles. It consi
- Oncotic pressureMeasure of pressure exerted by large dissolved molecules in biological fluids
- One and a half syndromeThe one and a half syndrome is a rare weakness in eye movement affecting both eyes, in whi
- OneirologyScientific study of dreams
- Online Mendelian Inheritance in ManOnline catalog of human genes
- Opal (fuel)Type of Australian gasoline
- OpenWormSimulation of a roundworm
- OpiateSubstance derived from opium
- Opioid epidemicDeaths due to abuse of opioid drugs
- Opioid epidemic in the United StatesOngoing overuse of opioid medication in the US
- Opioid receptorGroup of biological receptors
- Opium LawThe Opium Law (Opiumwet in Dutch) is the section of the Dutch law which covers nearly all
- Optic canalThe optic foramen is the opening to the optic canal. The canal is located in the sphenoid
- Optic chiasmIn neuroanatomy, the optic chiasm, or optic chiasma (; from Greek χίασμα 'crossing', from
- Optic discOptic nerve head, the point of exit for ganglion cell axons leaving the eye
- Optic tractNeural pathway within the human visual system
- Optic vesicleThe eyes begin to develop as a pair of diverticula (pouches) from the lateral aspects of t
- Optical sectioningOptical sectioning is the process by which a suitably designed microscope can produce clea
- OptogeneticsControlling biological cells with light
- Optomotor responseIn behavioral biology, the optomotor response is an innate, orienting behavior evoked by w
- Ora serrataThe ora serrata is the serrated junction between the choroid and the ciliary body. This ju
- Orbicularis oculi muscleThe orbicularis oculi is a muscle in the face that closes the eyelids. It arises from the
- Orbicularis oris muscleIn human anatomy, the orbicularis oris muscle is a complex of muscles in the lips that enc
- Orbit (anatomy)Cavity or socket of the skull in which the eye and its appendages are situated
- Orbital part of frontal boneThe orbital or horizontal part of the frontal bone (pars orbitalis) consists of two thin t
- OrexinNeuropeptide that regulates arousal, wakefulness, and appetite
- Orexin-AOrexin-A, also known as hypocretin-1, is a naturally occurring neuropeptide and orexin iso
- OrganogenesisPhase of embryonic development
- Orientation columnRegions of neurons in the brain
- Orientations of Proteins in Membranes databaseOrientations of Proteins in Membranes (OPM) database provides spatial positions of membran
- Orienting responseOrganism's immediate response to a change in its environment
- OrosomucoidAcute phase protein found in plasma
- OrthopneaShortness of breath when lying flat
- Os clitoridisThe os clitoridis (also called the os clitoris, clitoral bone or baubellum; pl.: baubella)
- Osmotic shockShock caused by a sudden change in the solute concentration around a cell
- OssificationDevelopment process in bones
- OsteoblastCells that form bone tissue
- OsteoclastCell that removes bone tissue
- Otic ganglionParasympathetic ganglion of the head and neck
- OvalbuminOvalbumin (abbreviated OVA) is the main protein found in egg white, making up approximatel
- Ovarian surface epitheliumThe ovarian surface epithelium, also called the germinal epithelium of Waldeyer, or coelom
- Overflow incontinenceOverflow incontinence is a concept of urinary incontinence, characterized by the involunta
- Oxygen saturationMeasure of dissolved or carried oxygen
- Oxygen saturation (medicine)Medical measurement
- Oxygen–hemoglobin dissociation curveVisual tool used to understand how human blood carries and releases oxygen
- Oxyphil cell (parathyroid)Cell type
- OxytalanOxytalan fibers are elastic-like fibers that run parallel to the tooth surface and bend to
