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The most prominent projecting point of the occipital bone at the base of the skull.

[Greek īnion, occipital bone, from īs, īn-, sinew, fiber; see wei- in Indo-European roots.]


(Anatomy) anatomy the most prominent point at the back of the head, used as a point of measurement in craniometry
[C19: from Greek: back of the head]


(ˈɪn i ən)

the bulging part of the human occipital bone at the back of the skull.
[1805–15; < New Latin < Greek īníon nape of the neck]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.inion - the craniometric point that is the most prominent point at the back of the head (at the occipital protuberance)
craniometric point - a landmark on the skull from which craniometric measurements can be taken
occipital bone - a saucer-shaped membrane bone that forms the back of the skull
References in periodicals archive ?
Anteroposterior Dimension (APD): The maximum length of the cranial diameter from the glabella to the external occipital protuberance is measured using a spreading calliper.
From qualitative point of view, the roughness of the nuchal lines and the prominence of the external occipital protuberance are good indicators for the diagnosis of sex (Rogers, 2005).
Treatment technique: Sub-occipital Muscle Inhibition (SMI): With the patient supine, the therapist sat at the head of the table and places the palms of hands under the subject's head, pads of therapist's fingers on the projection of the posterior arch of the atlas which is palpated between the external occipital protuberance and spinous process of axis vertebra.