135-170Yehudah ben Ilai

Sayings of Yehuda ben Ilai extracted from the tractates Pesachim and Chullin (Babylonian Talmud). Babylonian Talmud was written between about 450 - 550 in present-day Iraq (formerly Babylonia). The religious scholar Yehuda ben Ilai points out the distal attachment site of the ligamentum capitis femoris (LCF) and demonstrates knowledge of the possibility of its injury. See our commentary at the link: 135-170Yehudah ben Ilai [Rus].

Quote 1.

[Heb]

Pesachim 22a5

(original source: sefaria.org)

Quote 2.

[Heb]

Pesachim 83b5

(original source: sefaria.org)

Quote 3.

[Heb]

Pesachim 83b6

(original source: sefaria.org)

Quote 4.

[Heb]

Pesachim 83b7

(original source: sefaria.org)

Quote 5.

[Heb]

Chullin 91a12

(original source: sefaria.org)

Quote 6.

[Heb]

Chullin 96a5

(original source: sefaria.org)

Quote 7.

[Heb]

Chullin 96b2

(original source: sefaria.org)

Quote 8.

[Heb]

Chullin 96b3

(original source: sefaria.org)

Translation

Quote 1.

[Eng]

Passover Festivals 22a5

The Gemara answers: Whom did you hear that said that sinews do not give flavor? It is Rabbi Shimon, as it was taught in a baraita: With regard to one who eats the sciatic nerve from a non-kosher domesticated animal, Rabbi Yehuda deems him liable to receive two sets of lashes: One for eating the sciatic nerve and one for eating the meat of a non-kosher animal. And Rabbi Shimon exempts him entirely, since according to his opinion the prohibition to eat the sciatic nerve applies only to a kosher animal. In addition, one violates the prohibition of eating from a non-kosher animal only when it has the flavor of meat. (original source: sefaria.org)

Quote 2.

[Eng]

Passover Festivals 83b5

Granted, if you say they are meat, due to that they require burning; but if you say they are not meat, why do they require burning? One should simply discard them like other waste. Rav Ḥisda said: The mishna’s mention of sinews is necessary only for the sciatic nerve, in accordance with the opinion of Rabbi Yehuda. (original source: sefaria.org)

Quote 3.

[Eng]

Passover Festivals 83b6

As it was taught in a baraita that Rabbi Yehuda said: The prohibition to eat the sciatic nerve according to Torah law applies only to the sciatic nerve in one of the animal’s thighs, and not to both, and logic dictates that it is the right thigh. However, since there is no absolute proof that this is correct, the sciatic nerve must be removed from both sides. Although in theory the forbidden sciatic nerve may be discarded and the permitted one may be eaten, since there is uncertainty as to which one is permitted, neither of them may be eaten. Both must be burned. (original source: sefaria.org)

Quote 4.

[Eng]

Passover Festivals 83b7

The Gemara asks: Shall we then conclude that Rabbi Yehuda was uncertain about which sciatic nerve is forbidden? The Sages were unsure whether Rabbi Yehuda was absolutely convinced that it is the sciatic nerve from the right side that is forbidden, or if he was saying that this would seem likely to be the case, but he was not certain. As, if it were clear to him that it is the sciatic nerve from the right thigh that is forbidden, the proper procedure would be different: The one that is permitted we should eat, and the one that is forbidden we should discard. Why should he require burning? (original source: sefaria.org)

Quote 5.

[Eng]

Chullin 91a12

The Gemara asks: And what is the reason that Rabbi Yehuda holds that only the sciatic nerve of the right thigh is forbidden by Torah law? Rava said that it is because the verse states: “Therefore the children of Israel eat not the sciatic nerve that is upon the spoon of the thigh” (Genesis 32:33). The definite article indicates that this is referring to the most important thigh. (original source: sefaria.org)

Quote 6.

[Eng]

Chullin 96a5

MISHNA: One who removes the sciatic nerve must scrape away the flesh in the area surrounding the nerve to ensure that he will remove all of it. Rabbi Yehuda says: Scraping is not required; it is sufficient to excise it from the area above the rounded protrusion in order to thereby fulfill the mitzva of removal of the sciatic nerve. (original source: sefaria.org)

Quote 7.

[Eng]

Chullin 96b2

And according to Rabbi Yehuda, from where is it derived that one is liable for eating one olive-bulk of a larger sciatic nerve? He holds that it is derived from the phrase “that is upon the spoon of the thigh,” which indicates that even if one eats only the part of the sciatic nerve that is upon the spoon of the thigh, rather than the entire sciatic nerve, he is liable. (original source: sefaria.org)

Quote 8.

[Eng]

Chullin 96b3

And how do the Rabbis interpret that phrase? That phrase is necessary to teach the halakha stated by Shmuel, as Shmuel said: The Torah prohibits only the part of the sciatic nerve that is on the rounded protrusion of flesh shaped like a spoon. And what does Rabbi Yehuda hold with regard to the halakha stated by Shmuel? He derives from the fact that it is written: “The spoon of the thigh,” that the sciatic nerve of the entire thigh is forbidden, not just the part that is on the rounded protrusion of flesh shaped like a spoon. (original source: sefaria.org)

Explanation: Chullin 96b4-5

4. And how do the Rabbis interpret “the spoon of the thigh”? According to the Rabbis, this expression indicates that the prohibition of the sciatic nerve applies to the nerve that extends throughout the entire thigh, i.e., the inner nerve, which serves to exclude the outer nerve, which is not forbidden by Torah law; but in fact, only the part of the inner nerve that is on the protrusion of flesh shaped like a spoon is forbidden, not the entire inner nerve. (original source: sefaria.org)

5. The Gemara objects: But this term “spoon” is required to exclude the sciatic nerve of a bird, which does not have a rounded protrusion on its thigh bone that can be described as the spoon of the thigh, as taught in the mishna (89b). The Gemara explains: There are two usages of the term “spoon” written in the verse, and therefore two separate halakhot can be derived from this term. (original source: sefaria.org)

External links

Babylonian Talmud. Pesachim (The William Davidson Edition). 450-550. [sefaria.org]

Babylonian Talmud. Chullin (The William Davidson Edition). 450-550. [sefaria.org]

Babylonian Talmud. Tract. Pesachim (Passover). Trans. M.L. Rodkinson, Vol. 5. Boston: The Talmud Society, 1918. [archive.org]

Authors & Affiliations

Yehuda ben Ilai (Yehudah ben Il'ai, Yudah ben Ilai, Judah beRabbi Ilai, Rabbi Yehuda, Rabbi Judah, Judah bar Ilai; ca. 135 – ca. 170) was a teacher (rabbi), tannaim - fifth generation, lived in Usha (Galilee). [jewishencyclopedia.com , sefaria.org , wikipedia.org]

Keywords

ligamentum capitis femoris, ligamentum teres, ligament of head of femur, Bible, Torah, animals, damage, attachment, synonym

NB! Fair practice / use: copied for the purposes of criticism, review, comment, research and private study in accordance with Copyright Laws of the US: 17 U.S.C. §107; Copyright Law of the EU: Dir. 2001/29/EC, art.5/3a,d; Copyright Law of the RU: ГК РФ ст.1274/1.1-2,7

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Comments

1902RilkeRM

Works of art that mention ligamentum capitis femoris (LCF) are extremely rare. One such work is the poem «Der Schauende» ( He Who Visions, The Seer, The Man Watching, The Beholder) b y Rainer Rilke. Below is the original text in German. Der Schauende 1. Ich sehe den Bäumen die Stürme an, die aus laugewordenen Tagen an meine ängstlichen Fenster schlagen, und höre die Fernen Dinge sagen, die ich nicht ohne Freund ertragen, nicht ohne Schwester lieben kann. 2. Da geht der Sturm, ein Umgestalter, geht durch den Wald und durch die Zeit, und alles ist wie ohne Alter: die Landschaft, wie ein Vers im Psalter, ist Ernst und Wucht und Ewigkeit. 3. Wie ist das klein, womit wir ringen, was mit uns ringt, wie ist das groß; ließen wir, ähnlicher den Dingen, uns so vom großen Sturm bezwingen, - wir würden weit und namenlos. 4. Was wir besiegen, ist das Kleine, und der Erfolg selbst macht uns klein. Das Ewige und Ungemeine will nicht von uns gebogen sein. Das ist der Enge...

1730CheseldenW

Fragments from the book Cheselden W. The Anatomy of the Human Body (1730). The author draws attention to the role of ligamentum capitis femoris (LCF) in counteracting hip dislocation and maintaining the femoral head in the joint. The work notes that the LCF is “powerful” and “short” - “about two inches” i.e. approximately 5 cm! This error will be corrected in a subsequent treatise ( 1733CheseldenW ) . Quote pp. 43 - 44 Chap. VII. Of the Ligaments At the upper part of the articulation of the Os Femoris and Os Innominatum, is a strong ligament of great consequence; it contributing very much to preserve that joint from being luxated by the weight of the body. And from the lower edge of the Acetabulum of the Os Innominatum, runs a ligament to the middle of the head of the Os Femoris, about two inches long (which the Motion in this joint requires) called Teres, or Rotundum, whose use is to prevent the Os Femoris from being luxated upwards, but down wards it will le...

LCF in 2026 (May)

LCF in 2026 (May ) (Quotes from articles and books published in May 2026 mentioning the ligamentum capitis femoris) Kim, P. S., Kang, C., Lee, J. K., & Hwang, J. M. (2026). Hip arthroscopy to treat symptomatic paralabral cysts: a retrospective analysis of clinical outcomes. Arthroscopy and Orthopedic Sports Medicine , 13 (1), 27-34. [i] e-aosm.org Ko, H. Y. (2026). Vascular Anatomy of the Extremities and Lungs. In Practical Functional Anatomy for Spinal Cord Injury Rehabilitation: A Guide for Physiatrists and Rehabilitation Specialists (pp. 191-223). Singapore: Springer Nature Singapore. [ii] link.springer.com Aiba, H., Yamaguchi, M., Kimura, H., & Murakami, H. (2026). Advances in limb-salvage surgery and reconstruction for pediatric bone and soft tissue tumors. Frontiers in Pediatrics , 14 , 1817788. [iii] pmc.ncbi.nlm.nih.gov Bajwa, A., Villar, R., ...

1851HyrtlJ

The author expresses a classic view on the functions of the ligamentum capitis femoris (LCF): a conductor of blood vessels and a limiter of adduction of the femur. J. Hyrtl believed that it was impossible to completely dislocate the hip without tearing the LCF. Hyrtl J. Lehrbuch der Anatomie des Menschen, mit Rücksicht auf physiologische Begründung und praktische Anwendung. Wien: W. Braumüller, 1851. [fragment] Quote p. 265 In der Höhle des Gelenks liegt das runde Band des Schenkelkopfes (Lig. teres), welches an der Incisura acetabuli entspringt, und bei richtiger Neigung des Beckens, senkrecht zur Grube des Schenkelkopfes aufsteigt. Es beschränkt dieses Band die Zuziehung des Schenkels, und schreibt zugleich den durch die Incisura acetabuli eindringenden Blutgefässen den Weg vor, den sie zum Oberschenkelkopfe zu nehmen haben. Da das Band, wenn es in die Höhle des Gelenkes vorragen würde, durch Reibung viel zu leiden hätte, so...

1626BartholinC

Fragment from the book Bartholin C. Anatomicae Institutiones Corporis Humani (1626). The author describes the anatomy, topography, geometric and mechanical properties of the ligamentum capitis femoris (LCF). The term «terete» (rounded) is used to indicate its geometry. The term «cartilagine» (cartilaginous) is used to describe the hardness of the LCF, and the analogy of «nervus esset cartilaginosus» (like a cartilaginous sinew) is given. Similar terminological elements are present in the works of Galen of Pergamon and Theophilus Protospatharius ( 2020ArkhipovSV_ProlyginaIV ). See the previous edition at the link: 1611BartholinC Quote p. 409 [Lat] Cap. XXI. DE OSSIBUS TOTIUS PEDIS. … I. Est caput maximum & rotundum, ex appendice factum, quod in coxendicis acetabulum inseritur, & duplici ligamento cum coxendice nectitur: uno communi, lato, membraneo, sed satis crasso, orbiculatum articulum ambiente; altero terete, quasi cartilagine (ac si nervus esset cart...

1905BardeenCR

An excerpt from the article by Bardeen CR. Studies of the development of the human skeleton (1905). The author briefly discusses the emergence of the ligamentum capitis femoris (LCF). Quote p. 287 The hip-joint is represented at first by a dense mass of scleroblastema, Fig. 55. The development of the acetabulum by ingrowth and fusion of processes from the iliac, ischial and pubic cartilages has already been described. The cartilagenous joint-cavity is at first quite shallow, Fig. 56. But extension of cartilage into the blastemal tissue which passes from the pelvis over the head of the femur serves greatly to deepen it on all sides except in the region of the cotyloid notch. The joint-cavity is at first completely filled with a dense blastemat tissue, Fig. 56. While the embryo is growing from 20 to 30 mm. in length cavity formation begins in the tissue lying between the cartilagenous floor of the acetabulum and the head of the femur. The first stage in the process is marked by a c...

1720RuyschF

The author draws attention to the well-developed blood supply of the acetabular fossa, as well as the ligamentum capitis femoris (LCF). In the work, it is referred to as the «ligamentum nerveo-cartilagineum», which literally means the tough cartilaginous ligament and implies its strength. With the difficulty of accessing the acetabular fossa, and therefore the LCF, Frederik Ruysch associates the inefficiency of treating hip joint pain. The writer presumably implies osteoarthritis. In our opinion, its development is initiated by the pathology of the LCF ( 2012АрхиповСВ ). The discussed work includes a black and white drawing of the LCF of a child, made by the illustrator Jan Wandelaar. In color, the same preparation, but from a different angle, was depicted by the artist Jan l'Admiral in a separate publication ( 1738LadmiralJ ). Ruysch F. Adversarium anatomico-medico-chirurgicorum decas secunda. In quâ varia notatu digna recensentur. Cum figuris aeneis. Amsterdami: a...

Human Children. Retelling of Chapter 14

Short retelling of chapter 14 of the essay: Arkhipov S.V. Human Children: The Origins of Biblical Legends from a Physician's Perspective. Joensuu: Author's Edition, 2025. [In Russian] Chapter 14. ESAU AND JACOB At 40, Isaac marries Rebekah, his cousin’s daughter. Their marriage is long childless until Rebekah conceives twins, detected prenatally, possibly by her large belly or palpation. Genesis states that at 60, Isaac fathers the twins, born naturally after 20 years of marriage. The first, Esau, emerges “red, all hairy like a cloak,” followed by Jacob, unremarkable but grasping Esau’s heel. Over time, their differences deepen: Esau, a skilled hunter, roams fields; Jacob, gentle, stays in tents. Famine forces the family from “Beer-Lahai-Roi” in the Negev to “Gerar’s Philistine king,” then to “Gerar’s valley,” and finally to Beersheba. At 40, Jacob, urged by Rebekah, deceives blind Isaac to steal Esau’s inheritance, sparking enmity. Rebekah advises Jacob to flee to rela...

Human Children. Retelling of Chapter 1

Short retelling of chapter 1 of the essay: Arkhipov S.V. Human Children: The Origins of Biblical Legends from a Physician's Perspective. Joensuu: Author's Edition, 2025. [In Russian] Chapter 1. THE BEGINNING OF THE WORLD The Bible stands as a remarkable testament to religious and philosophical thought, passed down through the ages with minimal alterations. At its core lies a collection of texts rooted in the sacred writings of Jewish and Samaritan traditions, known as the Torah, meaning "Law" or "Teaching." In its narrowest sense, the Torah comprises the first five books of the Hebrew Bible, collectively called the Tanakh—an acronym derived from the Hebrew terms for "Law/Teaching" (Torah), "Prophets" (Nevi’im), and "Writings" (Ketuvim). Beyond this Written Torah, there exists an Oral Torah, which includes the Mishnah, Talmud, and Midrash, offering interpretations and expansions of the written texts. The Written Torah it...

1877MorrisH

An excerpt from the article by Morris H. Dislocations of the Thigh: their mode of occurrence as indicated by experiments, and the Anatomy of the Hip-joint (1877, pp. 161-170). The author noted that the ligamentum capitis femoris (LCF) is stretched during flexion, adduction, and external rotation. It was found that the LCF is always damaged in hip dislocations, is more often torn from the femur, and is rarely ruptured. Discussion of article see article 1877BrookeC . DISLOCATIONS OF THE THIGH: THEIR MODE OF OCCURRENCE AS INDICATED BY EXPERIMENTS AND THE ANATOMY OF THE HIP-JOINT. BY HENRY MORRIS, M.A., M.B., F.R.C.S., ASSISTANT SURGEON TO, AND LECTURER ON ANATOY1 AT, THE MIDDLESEX HOSPITAL. Received January 9th-Read February 13th, 1877. RECENTLY, whilst making various dissections of the hip-joint, the usually accepted doctrine that dorsal and ischiatic dislocations of the femur occur when the thigh is in a position of adduction appeared to me as very improbable, on anatomi...

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