in·fun·dib·u·lum, pl. infundibula (in'fŭn-dib'yū-lŭm, -lă)
1. [TA] A funnel or funnel-shaped structure or passage.
2. Synonym(s): infundibulum of uterine tube.
3. The expanding portion of a calyx as it opens into the pelvis of the kidney.
4. Synonym(s): arterial cone.
5. Termination of a bronchiole in the alveolus.
6. Termination of the cochlear canal beneath the cupola.
7. The funnel-shaped, unpaired prominence of the base of the hypothalamus behind the optic chiasm, enclosing the infundibular recess of the third ventricle and continuous below with the stalk of the hypophysis.
8. The contact surface indentation in the incisor and cheek teeth of a horse.
Synonym(s): mark (2) .
http://medical-dictionary.thefreedictionary.com/infundibulum

calix [kaliks] (pl. calices) (L.)
a cuplike organ or cavity. adj., adj caliceal.

But I can only find examples spelt with a "y" - "calyceal"



Percutaneous Nephroscopic Surgery
www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC)
by TK Hwang - ‎2010 - ‎Cited by 21 - ‎Related articles
May 19, 2010 - ... superior and inferior aspects of the middle calyceal infundibulum or the medial and lateral aspects of the upper calyceal infundibulum [52].

Tuberculous infundibular stenosis. (A) Retrograde pyelo | Open-i
https://openi.nlm.nih.gov/detailedresult.php?img=PMC2873882_...
... the less vascular superior and inferior aspects of the middle calyceal infundibulum or the medial and lateral aspects of the upper calyceal infundibulum [52].

Interventional Management of Urological Diseases
https://books.google.es/books?isbn=4431356428
S. Baba, ‎Y. Ono - 2007 - ‎Medical
... the less- vascular superior and inferior aspects of the middle calyceal infundibulum or the medial and lateral aspects of the upper calyceal infundibulum [40].

Download PDF - Springer
link.springer.com/content/pdf/10.1007%2F978-4-431-35642-4_2.pdf
by TK Hwang - ‎Cited by 1 - ‎Related articles
vascular superior and inferior aspects of the middle calyceal infundibulum or the medial and lateral aspects of the upper calyceal infundibulum [40]. Reported ...

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Note added at 5 hrs (2016-07-19 07:25:08 GMT)
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Sorry - I've just realised it's the same paper in the four refs...

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Note added at 8 hrs (2016-07-19 09:49:51 GMT)
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Certainly worth a question Eileen, IMO it's not straightforward.

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Note added at 8 hrs (2016-07-19 09:50:56 GMT)
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And you're very welcome.....