AbstractsBiology & Animal Science

Myology of the pectoral girdle of the golden hamster

by William Merton Spooner




Institution: Boston University
Department:
Year: 1949
Record ID: 1542643
Full text PDF: http://hdl.handle.net/2144/6309


Abstract

In the literature which is written on rodent myology there is not much reference made to the morphology of the golden hamster. Parsons (1896) reports on some hamsters that he dissected. Priddy and Brodie (1948) have published the only recent work on the morphology of the golden hamster. This study is concerned with the myology of the pectoral girdle of the golden hamster. The pectoral girdle is compared with that of the laboratory rat (Greene, 1935), the wood rat (Howell, 1926), the kangeroo rat (Howell, 1932), the pocket gopher (Hollinger, 1916) and the rabbit (Bensley, 1938). Parsons work on the comparative myology of the sciuromorphine, hystricomorphine and myomorphine rodents (1894 and 1896) is referred to extensively. The following muscles are included in this study: M. clavotrapezius, M. acromiotrapezius, M. spinotrapezius, M. sternomastoideus, M. cleidomastoideus, M. subclavius, M. atlantoscapularis, M. occipitoscapularis, M. levator scapulae, M. seratus magnus, M. rhomboideus anticus, M. rhomboideus posticus, M. acromiodeltoideus, M. spinodeltideus, M. suspraspinatus, M. infraspinatus, M. subscapularis, M. teres major, M. teres minor, M. coracobrachialis, M. pectoralis, M. latissimus dorsi, M. epitrochlearis, M. anconeus, M. triceps longus, M. triceps lateralis, M. triceps medialis, M. biceps brachii and M. brachialis. The origins and insertions or the following muscles had the normal relationships in the golden hamster: sternomastoideus, cleidomastoideus, subclavius, acromiodeltoideus, spinodeltoideus, supraspinatus, infraspinatus, subscapularis, teres major, latissimus dorsi, anconeus, triceps longus, triceps lateralis, triceps medialis and brachialis. The trapezius muscle in the hamster is clearly divided into three parts: clavotrapezius, acromiotrapezius and spinotrapezius. The origin of the spinotrapezius showed some variation in the animals that were dissected. The trapezius complex of muscles showed differences in the laboratory rat (Greene, 1935) and in the pocket gopher (Hollinger, 1916). The atlantoscapularis in the hamster arises from the atlas only, but in the rabbit the atlantoscapularis arises from the sphenoocipital synchondrosis. Parsons reports that in the sciuromorphine and hystricomorphine rodents (1894) the origin may be from either place mentioned above. The occipitoscapularis is a distinct muscle in the hamster, laboratory rat and the wood rat. Bensley (1938) treats this muscle as a part of the levator scapulae complex. Parsons (1894 and 1896) and Howell (1932) treat the occipitoscapularis as part of the rhomboideus complex. The levator scapulae in the hamster originates from the lateral processes of the last three cervical vertebrae and from the first three ribs. The other animals in this study vary considerably as to points of origin. The serratus magnus in the hamster originates from the third to the ninth rib. The other animals in this study vary considerably as to points of origin. Most of the authors in this study treated the levator scapulae as part of the serratus magnus…