The Anthromica Library
The human body one structure at a time. Every page has a 3D model you can turn, with its parts numbered on it, where it sits, what it does and what supplies it.
193–216 of 348 · HeadClear filters
- Occipital boneOs occipitaleThe single bone at the back and base of the skull, ringing the foramen magnum and resting on the first neck vertebra.
- Occipital nodesNodi occipitalesA few lymph nodes at the back of the head, near the upper edge of trapezius, draining the occipital scalp.
- Occipital polePolus occipitalisThe rounded rear tip of each cerebral hemisphere, at the back end of the occipital lobe above the tentorium cerebelli.
- Occipital sinusSinus occipitalisThe smallest dural venous sinus, running in the attached edge of the falx cerebelli from the foramen magnum up to the confluence of sinuses.
- Occipital veinVena occipitalisA vein of the back of the scalp that drains the occipital region and links with the dural sinuses through emissary veins.
- Occipitalis muscleMusculus occipitalisThe occipitalis is the thin, four-sided back belly of the scalp muscle, running from the back of the skull to the epicranial aponeurosis.
- Oculomotor nerve (III)Nervus oculomotorius (III)The third cranial nerve, running from the midbrain to the orbit to move most eye muscles, lift the upper lid and narrow the pupil.
- Olfactory nerve (I)Nervus olfactorius (I)The first cranial nerve: fine bundles carrying smell from the roof of the nasal cavity through the ethmoid bone to the olfactory bulb.
- Olfactory sulcusSulcus olfactoriusA straight groove on the underside of each frontal lobe, parallel to the midline, in which the olfactory bulb and tract lie.
- OliveOlivaAn oval swelling on the front of the medulla oblongata, beside the pyramid, produced by the inferior olivary nucleus beneath it.
- Opercular part of inferior frontal gyrusPars opercularis gyri frontalis inferiorisThe hindmost section of the inferior frontal gyrus, lying in front of the precentral gyrus and covering part of the insula.
- Ophthalmic arteryArteria ophthalmicaAn internal carotid branch, given off just beyond the cavernous sinus, that enters the orbit with the optic nerve to supply the eye.
- Ophthalmic nerveNervus ophthalmicusThe smallest, uppermost trigeminal division, sensory to the eye, upper eyelid, forehead, scalp and part of the nose.
- Optic chiasmChiasma opticumThe X-shaped junction below the hypothalamus where the two optic nerves meet and their nasal fibres cross to the opposite side.
- Optic nerve (II)Nervus opticus (II)The second cranial nerve, a bundle of axons from the retina running through the optic canal to the optic chiasm.
- Optic tractTractus opticusThe band of visual fibres running back from the optic chiasm round the cerebral peduncle to the lateral geniculate body.
- Orbicularis oris muscleMusculus orbicularis orisThe orbicularis oris is the ring of muscle inside the lips that surrounds the mouth opening, closing it and pursing the lips.
- Orbital gyriGyri orbitalesThe four gyri on the concave underside of the frontal lobe, arranged around an H-shaped orbital sulcus above the roof of the orbit.
- Orbital part of inferior frontal gyrusThe front and lowest section of the inferior frontal gyrus, lying below the anterior limb of the lateral sulcus and curving onto the orbital surface.
- Orbital part of orbicularis oculiPars orbitalis musculi orbicularis oculiThe orbital part of orbicularis oculi is the thick outer ring of the eyelid sphincter, lying over the orbital rim and closing the eye tightly.
- Orbitofrontal branches of anterior cerebral arteryRami orbitofrontales arteriae cerebri anteriorisBranches of the anterior cerebral artery that run forward under the frontal lobe to supply its medial orbital surface and the olfactory bulb and tract.
- Palatine boneOs palatinumAn L-shaped paired bone at the rear of the nasal cavity that completes the hard palate and reaches up into the orbit.
- Palatine tonsilTonsilla palatinaA paired mass of lymphoid tissue in the side wall of the oropharynx, lodged between the palatoglossal and palatopharyngeal arches.
- Palpebral part of orbicularis oculiPars palpebralis musculi orbicularis oculiThe palpebral part of orbicularis oculi is the thin, pale sheet of muscle within both eyelids that closes them gently in blinking and sleep.