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In human anatomy, the pars flaccida of tympanic membrane or Shrapnell's membrane (also known as Rivinus' ligament) is the small, triangular, flaccid portion of the tympanic membrane, or eardrum. It lies above the malleolar folds attached directly to the petrous bone at the notch of Rivinus .
Tympanic membrane retraction describes a condition in which a part of the eardrum lies deeper within the ear than its normal position.. The eardrum comprises two parts: the pars tensa, which is the main part of the eardrum, and the pars flaccida, which is a smaller part of the eardrum located above the pars tensa.
The relatively fragile pars flaccida lies above the lateral process of the malleus between the Notch of Rivinus and the anterior and posterior malleal folds. Consisting of two layers and appearing slightly pinkish in hue, it is associated with [ vague ] Eustachian tube dysfunction and cholesteatomas .
The hepatogastric ligament or gastrohepatic ligament connects the liver to the lesser curvature of the stomach.It contains the right and the left gastric arteries.In the abdominal cavity, it separates the greater and lesser sacs on the right.
Prussak's space is important because it is a site for pars flaccida acquired cholesteatoma formation. [5] A cholesteatoma forms when there is a deep retraction pocket in the tympanic membrane. The lining of the tympanic membrane, which is skin, is shed, but if the membrane is retracted it gets trapped.
He divided the membrane into two parts; the pars tensa (tense portion) and the pars flaccida (flaccid portion). In 1832 he published his findings in the London Medical Gazette in an article titled "On the form and structure of the membrana tympani".
Human vestibular system of the semicircular canals in the inner ear. The vestibular system, in vertebrates, is a sensory system that creates the sense of balance and spatial orientation for the purpose of coordinating movement with balance.
The vestibular duct or scala vestibuli is a perilymph-filled cavity inside the cochlea of the inner ear that conducts sound vibrations to the cochlear duct. [1]It is separated from the cochlear duct by Reissner's membrane and extends from the vestibule of the ear to the helicotrema where it joins the tympanic duct.