Licence: Public Domain Mark
Credit: Abnormalities in human myology / by J.F. Knott. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![1XIII. Abnormalities in Human Myology. By J. F. Knott, F.It.C.S.I. [Read, April 11, 1881.] The following is an imperfect list of the muscular anomalies which have come under my notice during the four winters which I have occupied the office of Demonstrator of Anatomy in the School of the Koyal College of Surgeons. During that time I have paid particular attention to some of those which struck mo in the commencement as being specially important or interesting, and which attracted my atten- tion sufficiently to induce me to tabulate the frequency of their occur- rence. As I had not the advantage of any co-operation in the research, a very large proportion of the anomalies which might easily have been preserved were necessarily lost, from the fact that it was impossible for mo to distribute my attention over the dissection of so largo a number of subjects as were always passing through the room. My statistics are, accordingly, in many instances, very imperfect, although by no means so, I hope, in all; but, although not so valuable as could bo desired as an index of frequency, I venture to hope that the publi- cation of the j>rcsent collection will bo found interesting to those who have^ devoted any attention to this special department of Ana- tomy. The importance attached to these variations must daily increase in connexion with the absorbing interest of the study of muscular morphology, and of the homologous elements thereof in the various grades of the animal kingdom. Viewed from this stand- point, an otherwise somewhat dry catalogue of variations in Human Myology will be looked upon with favour by those who hail with welcome the addition of every small contribution to the hourly increasing treasury of our knowledge in this, ono of the most interesting departments of human study. Occipito-frontalis.—The early removal of the brain prevented me Irom examining this muscle completely, in a large proportion of the subjects of our dissecting-room. The frontal portion I have seldom tound to agree completely with the description given in our standard text-books. I have noted its peculiarities in twenty-eight cases, in ™ I examined it with special care. In only five of these did the fleshy fibres reach so high as the coronal suture. Below I have 'vays ound its fibres attached to the internal angular process of the os fi'ontis, some being continued into the pyramidalis nasi, and levator labn supenons alaeque nasi, but the great bulk of the fibres ™!i i Wlt l the orbicularis palpebrarum and corrugator supercilii, • i a aigc proportion adhered to the deep surface of the skin of I could never satisfy myself of an attachment of any orbital t0 v.aSal *!0Iie>. glabella, superciliary ridge, or supra- bital arch, as has been described by different observers. In every frcclv nexam™ed’ the deeP surface of the muscle appeared to glide y over those bony prominences, and to be connected thereto](https://iiif.wellcomecollection.org/image/b22381582_0005.jp2/full/800%2C/0/default.jpg)
