Abnormalities in human myology / by J.F. Knott.

  • Knott, John, 1853-1921.
Date:
1881
Catalogue details

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.

    23/29 page 425
    occurred twice in thirty-four subjects, and I have seen several other examples. The bilaminar form described by Meckel and Macalister occurred once. Once the muscle almost formed a triangle, the trun- cated apex of which was formed by the radial end. Cubit o-carpeus.—This rare muscle arises from lower end of ulna, where it is in close contact with the pronator quadratus, form- ing, in fact, a detached portion of the latter; and it passes inwards to be inserted into the tuberosity of the scaphoid bone and base of the first metacarpal. It nearly corresponds to the ulno-carpalis singular in anterior of Gruber; but the latter is large at its ulnar attachment as the normal pronator, and is wholly inserted into the carpus. Tensor ligamenti annularis (v. orbicularis) dorsalis (v. posterior).— Arising from the ulna behind the lesser sigmoid cavity, it is inserted into the posterior surface of the orbicular ligament of the radius. I found it as a distinct slip six times in thirty-four subjects. According to Macalister, its proportional frequency as a separate muscle is twenty- five per cent, of subjects examined; according to Gruber it has been found in seventy-four per cent, of fore-arms. Tensor ligamenti annularis (v. orbicularis) volaris (v. anterior).— Arises from the coronoid process of the ulna, and is inserted into the anterior surfaco of the orbicular ligament of the radius. It is much less frequently seen than the other : it occurred in my cases twice in thirty-fou? subjects: according to Krause, the average frequency of its occurrence is seven per cent. Supinator radii brevis accessorius.—Is a small slip from the brachialis anticus, going to the tubercle of the radius. I have seen two specimens. Extensor carpi radialis longior; brevier.—These muscles I have found completely inseparable five times in thirty-four bodies. In one of the cases three tendons were given off—one to the second metacarpal bone, two to the third. In another instance a normal longior sent an acces- sory tendon to accompany that of brevior. Brevior had a double in- sertion in two of the fore-arms into second and third metacarpal bones. Extensor communis digitorum.—Absence of the little finger tendon occurred in three of the subjects already referred to. Doubling of one or more of the tendons occurred in a large proportion of cases, but I made no note of the exact number. Extensor minimi digiti.—This was completely absent in one instance. In two other cases there was a double tendon: in one of these the two sups were inserted together; in the other the second tendon went to l L^?e^acarPa^ bone of the ring finger. In one case the muscle was (Kr ^ seconc^ Part forming the extensor minimi digiti accessorius Extensor brevis digitorum manus.—A rudimentary muscle, which is lound m various forms of development on the back of the hand. The proportion of cases in which it occurs is, according to Krause, from rce o seven per cent. It arises most frequently from the posterior annular ligament (Krause); sometimes from the end of the radius ' 1UUS) Humphry); from the bases of one or more of the metacarpal
    digitised image 1
    digitised image 2
    digitised image 3