Arterial Supply in the Human Pectoralis Minor Muscle

• MORIYA Atsushi

  First Department of Anatomy, Kyorin University School of Medicine

• TAKAFUJI Toyoharu

  First Department of Anatomy, Kyorin University School of Medicine

• SATO Yasushi

  First Department of Anatomy, Kyorin University School of Medicine

抄録

In the following, we report our findings obtained as a result of injecting an acrylic pigment in the arteries supplying the pectoralis minor muscle in 50 lateral chests of 26 Japanese adults (15 males and 11 females). In the pectoralis minor muscle, the muscular bundle near the terminal is supplied by A. processus coracoideris (Pc, Sato-Takafuji, '85) or A. coracobrachialis (Cb, Sato, '80) of A. axillaris (Ax), while its middle upper and lower peripherals are supplied by A. thoracoacromialis (Ta) and A. partis abdominalis (Pab, Sato, '76), respectively. Further, the upper and lower peripherals at its origin are supplied by A. thoracica suprema (Ts) and A. thoracica lateralis (Tl), respectively. Pc, Cb, Pab and Ts may occasionally be absent. Arteries supp lying this muscle are classified according to their origins and routes of distribution, as follows. Type I-a: Pc or Cb, Ta, Pab, Ts and Tl are present,32%; Type II-a: Ts is absent from Type I-a,14%; Type III-a: Pb and Pc are absent from Type I-a,20%; Type IV-a: Cb, Pc and Ts are absent from Type I-a,10%. Type b is Type a without Pab. The rates of appearance of Type I-b, II-b, III-b and IV-b were all 6%. The ratios of distribution in area a were as follows, in order of decreasing ratio: 37.6% for Pab (37 cases),32.4% for Tl(49 cases),30.2% for Ta (49 cases),10.8% for Ts (32 cases),7% for Cb (9 cases), and 6.37% for Pc. In the pectoralis minor muscle, the major supplying arteries are Pab, Tl and Ta, and where Pab was absent, this was compensated for by a branch of Ta. The total number of supplying arteries in this muscle was two to five, with the majority, or 36%, having four arteries. As for sex differences in the incidence of each type, Type I-a appeared more often in males (40%) than in females (20%). The rates according to the ribs of origin were 46%,36%,16%, and 2% for types 2-3-4-5,3-4-5,2-3-4, and 2-3-4-5-6, respectively. It was interesting that all Type II and Type IV cases without Ts corresponded to Type 3-4-5 without the muscular bundle arising from the second rib, as it suggests the process of degeneration of the pectoralis minor muscle in Homo. Innervating the pectoralis minor muscle, nerves containing fibers from the Truncus medius (mainly C7) were found in a small upper peripheral region, and those containing fibers from the Fasciculus medialis (C8, Th1) were distributed in the majority of the remainder in 50% of the subjects studied, while 36% lacked the branch from the Truncus medius. There was no strong correlation between the nerves and the type of arterial distribution.

収録刊行物

• Okajimas Folia Anatomica Japonica

  Okajimas Folia Anatomica Japonica 69 (6), 321-333, 1993

  Editorial Board of Okajimas Folia Anatomica Japonica

キーワード

• Human pectoralis minor muscle
• Arterial supply
• A. partis abdominalis
• A. thoracica lateralis
• A. thoracoacromialis

詳細情報

• CRID: 1390282680436965120
• NII論文ID: 130004650388
• DOI: 10.2535/ofaj1936.69.6_321
• COI: 1:STN:280:DyaK3s3is1emsg%3D%3D
• ISSN: 0030154X
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可