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From Embryology

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Plate 5. The Left Otic and Occipital Region - viewed from within

Encircling the zone of union of the pars cochlearis with the planum is a well-marked groove. The posterior portion of this, which may be known as the dorsal basicochlear groove (fig. 5), is crescentic in outline, and is fairly well defined. It contains the inferior petrosal sinus, and appears more sharply marked than in the models of Levi and Jacoby, judging from the illustrations of these authors. The ventral portion - much deeper and narrower - is also crescentic, and may be termed the ventral basicochlear groove (fig. 2). These grooves meet, above and below, their confluences being marked by notches, designated the sphenocochlear and occipitocochlear notches (fig. 5) respectively. The sphenocochlear notch occupies the interval between that part of the lateral surface of the corpus sphenoidale which lies dorsal to the processus alaris, medially, and the medial aspect of the cranial pole of the pars cochlearis, laterally (fig. 1). It is narrow and deep. The occipitocochlear notch is the ventromedial extremity of the jugular foramen.

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Links: plate 1 | plate 2 | plate 3 | plate 4 | plate 5 | plate 6 | fig 6 | fig 7 | plate 7 | fig 8 | fig 9 | plate 8 | fig 10 | plate 9 | fig 11 | fig 12 | plate 10 | plate 11 | fig 14 | Macklin 1914 part 1 | Macklin 1914 part 2 | Skull Development


Macklin CC. The skull of a human fetus of 40 mm 1. (1914) Amer. J Anat. 16(3): 317-386.

Cite this page: Hill, M.A. (2024, June 18) Embryology Macklin1914 plate05.jpg. Retrieved from

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