| OCR Text |
Show 1885.] MYOLOGY OF THE WATER-OPOSSUM. Fig. 3. J 3 A SB: -A.E. E.S.I P. -z-rE.O.M.F' FC. F.D.P.<' i. _AI, S.B. P.Q.^ PUT. Myology of Water-Opossum, A.E.,anconeus externus; E.S.I.P.,extensor secundiinternodiipoliicis; E.O.M.P., extensor ossis metacarpi poliicis ; S.B., supinator brevis ; A.I., anconeus internus; F.C.U., flexor carpi ulnaris; B.A., brachialis anticus; Bi., biceps ; S.B., supinator brevis ; F.B.P., flexor digitorum profundus ; P.R.T., pronator radii teres; P.Q., pronator quadratus. Muscles of Posterior Extremity. Gluteus maximus.-A thin triangular muscle, arising chiefly by fascia from anterior superior spine of ilium, from transverse processes of sacral vertebrae, and from caudal vertebrae as far as third or fourth. Anterior and middle fibres converge to be inserted into outer aspect of root of great trochanter ; posterior fibres inserted into linea aspera for its upper two thirds. It is quite free posteriorly, but in front turns round gluteus medius and joins anterior border of gluteus minimus. Gluteus medius.-Thin posteriorly, but thick and partly divisible into three laminae anteriorly. Arises from dorsum ilii, anterior superior iliac spine, and sacral vertebrae, continuous anteriorly with gluteus maximus. Its superficial part is inserted into outer surface, its deep part into upper border of great trochanter. Gluteus minimus.-Thin, arising from border of ilium between iliacus and gluteus medius. Inserted into anterior border of great trochanter, being continuous both at its origin and insertion with gluteus maximus. Gluteus quartus.-Thin muscular fibres, closely applied to capsule of hip-joint, arising superficial to rectus tendon and closely connected with it. It is inserted just below inner part of neck of femur between psoas and vastus internus. Pyriformis.-Arises from side of sacrum half an inch behind sacro- |
