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directed toward or situated at the back; opposite of anterior. Called also dorsal.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. human anatomy denoting the back surface of the body. Often used to indicate the position of one structure relative to another, that is, nearer the back of the body. Synonym(s): dorsalis [TA], dorsal (2) , posticus
2. After, in relation to time or space.
3. veterinary anatomy limited to structures of the eye and ear. The word is otherwise ambiguous with respect to the anatomy of quadrupeds; caudal is preferred.
[L. comparative of posterus, following]
Farlex Partner Medical Dictionary © Farlex 2012


(pŏ-stîr′ē-ər, pō-)
1. Located behind a part or toward the rear of a structure.
2. Relating to the caudal end of the body in quadrupeds or the back of the body in humans and other primates.
3. Botany Next to or facing the main stem or axis.
4. Coming after in order; following.
5. Following in time; subsequent.
The buttocks.

pos·te′ri·or·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


noun A euphemism for the buttocks.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


1. After, in relation to time or space.
2. human anatomy Denoting the back surface of the body. Often used to indicate the position of one structure relative to another, i.e., nearer the back of the body.
Synonym(s): dorsal (2) .
3. Near the tail or caudal end of certain embryos.
4. A substitute for caudal in quadrupeds; in veterinary anatomy, posterior is used only to denote some structures of the head.
[L. comparative of posterus, following]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Pertaining to the back of the body or a part. Dorsal. Compare ANTERIOR.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


1. After, in relation to time or space.
2. human anatomy denoting the back surface of the body. Often used to indicate the position of one structure relative to another, i.e., nearer the back of the body.
Synonym(s): dorsal (2) .
[L. comparative of posterus, following]
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about posterior

Q. Is there any reason behind this? a bipolar woman is mostly misdiagnosed for depression… there any reason behind this?

A. freebrid12 is right, and there's another thing- depression is a very common diagnosis amongst women and bipolar is less common. therefore psychiatrist tend to diagnose depression more then bipolar disorder.

Q. I have been having chronic pain in sinus area and behind my eyes, been to ENT who states it is not infection? I wake up with the pain and go to sleep in severe pain. Its all day and all night. Dr insists that its migraine related and allergy related. I have chronic postnasal drainage. It started 4 months ago when I moved into our new house. The pain makes me extremely fatigue and dizzy at times. I have been referred to the eye doctor, a headache specialist and an allergy specialist. Just recently I have had a CT scan and an MRI, as well as xrays of my sinus. Nothing other than a deviated septum and possible allergies from an ENT has been diagnosed. In the mean time I am waiting for the days to come when I can get into see these specialist. Anyone out there have any of the same symptoms?? Need help here. Soooooo sick of the pain.

A. i have chronic sinusitis and can really relate to what you describe. learned to live with the pain...but still, i use various ways to reduce inflammation in my sinuses, i heat the place up before going to sleep, try to avoid eating or drinking cold stuff.
another thing i do is i heat water (80c) then add a special oil i bought in a chinese medicine store , about 5 drops, and inhale the fumes. nettle tea can do wonders too.

Q. info on arachnoid cyst in the right posterior fossa

A. Basically it's like a small sac filled with fluid. The problem is that the skull is a rigid closed space, which means that if there's something other than the brain, it'll occupy space, usually on expense of the brains' space. These kinds of problems are often referred to as "space occupying lesion".

It's usually congenital (i.e. develops during pregnancy), and even when it cause symptoms they develop slowly.

YOu can read more here (

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References in periodicals archive ?
On the basis of our experience with the cases described in this report as well as our in vitro model, we recommend the use of anterior chamber maintainer with a stable infusion rate during the surgical treatment of traumatic cataract with posterior capsular rupture only.
In the current case, neurological symptoms occurred as the primary symptoms when metastatic spinal tumor of thyroid cancer was found at the posterior element fusion level after posterior fixation.
Lui, "Failure of flow diverter treatment of intracranial aneurysms related to the fetal-type posterior communicating artery," Neurointervention, vol.
The incidence in posterior fossa surgery can be as high as 17%.1 CSF leakage poses a risk of significant morbidity and remains potentially life-threatening due to the risk of meningitis.1,3,4 Furthermore, the costs related to treating patients affected by this complication have been estimated to be 141% >that of patients without a CSF leak.1
A total of sixty eyes of patients having posterior capsular opacification diagnosed on slip lamp examination were included in the study.
558 infants (32.54%) had posterior frenulum, which required the special maneuver that consisted in both elevating and pushing the tongue back simultaneously (Figure 2).
In this study, we compared two different IOL implantation techniques used in pediatric patients, i.e., those who underwent anterior vitrectomy and posterior capsulorhexis with in-the-bag IOL implantation and those in whom the IOL was captured behind the posterior capsule without an anterior vitrectomy.
PI indicates the maximum proportion of IAC that can be exposed by drilling while preserving the posterior semicircular canal.
The total amount of Nd:YAG laser energy used for posterior capsulotomy.
Cadavers were randomized either to lateral or posterior QL blocks or to the posterior QL block with a different needle trajectory.
Studies that explore preoperative evaluations of the integrity of the PC and the relationship between posterior opacity and the PC are very helpful for preparing for scheduling and designing surgical approaches.