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 [ah-pen´diks] (pl. appen´dices, appendixes) (L.)
1. a slender outgrowth or appendage.
2. a small appendage near the juncture of the small intestine and the large intestine (ileocecal valve). An apparently useless structure, it can be the source of a serious illness, appendicitis. Called also vermiform appendix. adj., adj appendic´eal.
vermiform appendix appendix (def. 2).


, gen.


, pl.




(ă-pen'diks, -di-sis, -di-sēs, -dik-sĕz),
1. An appendage or appendixlike structure.
2. A wormlike intestinal diverticulum extending from the blind end of the cecum; it varies in length and ends in a blind extremity. Synonym(s): appendix vermiformis [TA], appendix ceci, processus vermiformis, vermiform appendage, vermiform appendix, vermiform process, vermix
[L. appendage, fr. ap-pendo, to hang something on]


/ap·pen·dix/ (ah-pen´diks) pl. appen´dices, appendixes   [L.]
1. a supplementary, accessory, or dependent part attached to a main structure.

epiploic appendices  small peritoneum-covered tabs of fat attached in rows along the taeniae coli.
vermiform appendix  a wormlike diverticulum of the cecum.
Enlarge picture
Vermiform appendix and adjacent structures.
xiphoid appendix  see under process.


n. pl. appen·dices (-dĭ-sēz′) or appen·dixes
Anatomy Any of several supplementary or accessory parts of a bodily organ or structure, especially the vermiform appendix of the large intestine.


[əpen′diks] pl. appendices, appendixes
1 an accessory part attached to a main structure. Also called appendage.
2 See vermiform appendix. appendical, appendiceal, appendicial, appendicular, adj.


, pl. appendixes, appendices (ă-pendiks, -dik-sĕz, -di-sēz) [TA]
1. Synonym(s): appendage.
2. A wormlike intestinal diverticulum extending from the blind end of the cecum; it varies in length and ends in a blind extremity.
[L. appendage, fr. ap-pendo, to hang something on]


1. The worm-like structure attached to the CAECUM at the beginning of the large intestine and known as the vermiform appendix.
Appendixclick for a larger image
Fig. 42 Appendix . Location of appendix.



vermiform appendix

a small fingerlike projection from the tip of the CAECUM in the mammalian gut.

In herbivores the caecum and appendix are important, containing bacteria which facilitate the digestion of cellulose. In humans and other non-herbivores the caecum and appendix have no function. The appendix can become infected and must be removed surgically (appendectomy) if in this condition.


The worm-shaped pouch attached to the cecum, the beginning of the large intestine.


, pl. appendixes, appendices (ă-pendiks, -dik-sĕz, -di-sēz) [TA]
An appendage or appendixlike structure.
[L. appendage, fr. ap-pendo, to hang something on]


n 1. an accessory part of a main structure or text;
2. the term generally refers to the
vermiform appendix, which is located at the junction of the small and large intestines.


pl. appendices [L.]
1. a slender outgrowth or appendage.
2. the vermiform appendix, a slender diverticulum present in only a few mammals such as the rabbit, humans and the great apes. A structure of doubtful function, rich in lymphoid tissue.

appendix epididymis
a small, piriform body attached to the head of the epididymis that is a remnant of the blind cranial segment of the mesonephric duct.
appendix testis
a small cyst adjacent to the head of the epididymis that is a remnant of the paramesonephric (müllerian) duct. Called also Morgagni's hydatid.

Patient discussion about appendix

Q. What Causes Acute Appendicitis? I've heard that appendicitis is a very common situation. What causes it to happen? Is there a way to avoid it?

A. Appendicitis is caused by an infection of the appendix, usually from bacterias that are already located in the abdomen. It is not a situation that can be avoided and can occur in a high prevalence in the population.

More discussions about appendix
References in periodicals archive ?
In 2005, a case report of a 36-year-old man with a 28 cm, torsed and necrotic appendix was reported.
When imaged with CT, a mucocele of the appendix will typically manifest as homogenous hypoattenuating material that has Hounsfield values similar to water filling the lumen of the appendix.
For most of us, the appendix either points down towards the pelvis or straight out.
Although variation in the size and position of the appendix is common, duplication is rare and may be associated with other congenital abnormalities (1).
However, recent research has suggested that the appendix probably plays a role in infection control in the gut and may also aid in the digestion of your food.
Many biology texts today still refer to the appendix as a 'vestigial organ'," says Dr.
Finally, the book also has an online appendix: Appendix L.
Duplication of the vermiform appendix, originally described in 1903, is rare with a reported incidence of 0.
Key prevention messages, summarized in Appendix B, stress problems with overheating, not knowing what's in the drug, and feeling overconfident.
To ensure that the information in appendix A accurately describes the structure of check-processing operations within the Federal Reserve System, the final rule revises the lists of routing symbols associated with Federal Reserve offices to reflect the reassignments discussed above.
Appendix B: FSIS safety and security guidelines, for the transportation and distribution of meat, poultry, and egg products.
Appendix A--Lesson plans for field sanitation training course