title: Comparative anatomy, homologies and evolution of the pectoral and forelimb musculature of tetrapods with special attention to extant limbed amphibians and reptiles.
abstract: The main aim of the present work is to synthesize the information obtained from our dissections of the pectoral and forelimb muscles of representative members of the major extant taxa of limbed amphibians and reptiles and from our review of the literature, in order to provide an account of the comparative anatomy, homologies and evolution of these muscles in the Tetrapoda. The pectoral and forelimb musculature of all these major taxa conform to a general pattern that seems to have been acquired very early in the evolutionary history of tetrapods. Although some muscles are missing in certain taxa, and a clear departure from this general pattern is obviously present in derived groups such as birds, the same overall configuration is easily distinguishable in these taxa. Among the most notable anatomical differences between the groups, one that seems to have relevant evolutionary and functional implications, concerns the distal insertion points of the forearm musculature. In tetrapods, the muscles of the radial and ulnar complexes of the forearm are pleisomorphically mainly inserted onto the radius/ulna or onto the more proximal carpal bones, but in mammals some of these muscles insert more distally onto bones such as the metacarpals. Interestingly, a similar trend towards a more distal insertion of these muscles is also found in some non-mammalian tetrapod taxa, such as some anurans (e.g. Phyllomedusa). This may be correlated with the acquisition of more subtle digital movement abilities in these latter taxa.
authors.affiliation: U.N.T., Instituto de Herpetologia, Fundación Miguel Lillo, CONICET, Tucumán, Argentina. virginia@webmail.unt.edu.ar
authors.forename: Virginia
authors.initials: V
authors.lastname: Abdala
authors.forename: Rui
authors.initials: R
authors.lastname: Diogo
mesh_terms: D000663:Amphibians / Q000033:anatomy & histology; D000717:Anatomy, Comparative; D000818:Animals; D005552:Forelimb / Q000033:anatomy & histology*; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D012104:Reptiles / Q000033:anatomy & histology; D014714:Vertebrates / Q000033:anatomy & histology*
references.citation: Syst Biol. 2004 Oct;53(5):815-21
references.pmid: 15545258
references.citation: Anat Rec A Discov Mol Cell Evol Biol. 2006 Jan;288(1):46-57
references.pmid: 16342210
references.citation: BMC Dev Biol. 2008 Feb 28;8:24
references.pmid: 18307809
references.citation: J Anat Physiol. 1869 May;3(Pt 2):335-40
references.pmid: 17230809
references.citation: J Anat. 2009 May;214(5):694-716
references.pmid: 19438764
references.citation: Science. 1999 Feb 12;283(5404):998-1001
references.pmid: 9974396
references.citation: Clin Anat. 2009 May;22(4):481-8
references.pmid: 19373904
references.citation: J Exp Zool B Mol Dev Evol. 2009 Jan 15;312(1):30-41
references.pmid: 18942113
references.citation: Naturwissenschaften. 2003 Oct;90(10):473-6
references.pmid: 14564408
references.citation: J Anat. 2008 Sep;213(3):296-307
references.pmid: 18565111
references.citation: J Anat. 2008 Aug;213(2):159-72
references.pmid: 19172731
references.citation: J Anat Physiol. 1872 May;6(Pt 2):293-512.31
references.pmid: 17230935
references.citation: Dev Dyn. 2006 May;235(5):1194-218
references.pmid: 16502415
references.citation: Folia Morphol (Praha). 1971 Aug;19(3):252-8
references.pmid: 5142773
references.citation: J Exp Zool B Mol Dev Evol. 2005 May 15;304(3):206-19
references.pmid: 15880771
references.citation: J Morphol. 2007 Nov;268(11):986-1020
references.pmid: 17823914
references.citation: J Morphol. 2007 Jun;268(6):504-17
references.pmid: 17417805
references.citation: Syst Biol. 2005 Aug;54(4):530-47
references.pmid: 16085573
references.citation: Mol Phylogenet Evol. 1999 Oct;13(1):144-8
references.pmid: 10508547
references.citation: J Anat. 2008 Oct;213(4):391-424
references.pmid: 18657257
references.citation: Development. 1996 Oct;122(10):3229-42
references.pmid: 8898235
references.citation: J Morphol. 2009 Jan;270(1):14-51
references.pmid: 18798250
references.citation: J Exp Zool B Mol Dev Evol. 2005 Jan 15;304(1):86-90
references.pmid: 15515040
references.citation: Mol Biol Evol. 1988 Nov;5(6):603-25
references.pmid: 3065587
references.citation: Evol Dev. 2007 Nov-Dec;9(6):566-78
references.pmid: 17976053
references.citation: Anat Rec (Hoboken). 2009 Sep;292(9):1246-65
references.pmid: 19711458
references.citation: Anat Rec A Discov Mol Cell Evol Biol. 2003 Oct;274(2):891-916
references.pmid: 12973714
references.citation: J Exp Zool B Mol Dev Evol. 2005 May 15;304(3):198-205
references.pmid: 15880773
references.citation: J Anat. 1950 Jan;84(Pt 1):13-29
references.pmid: 17105089
references.citation: J Morphol. 2007 Jun;268(6):457-84
references.pmid: 17372936
references.citation: J Anat. 1939 Jan;73(Pt 2):211-33
references.pmid: 17104753
references.citation: J Morphol. 1977 Apr;152(1):101-140
references.pmid: 30253636
references.citation: Gene. 2000 Dec 23;259(1-2):139-48
references.pmid: 11163971
references.citation: J Anat. 2009 Sep;215(3):300-19
references.pmid: 19531159
references.citation: J Morphol. 2007 May;268(5):423-41
references.pmid: 17390336
references.citation: Cladistics. 1988 Jun;4(2):105-209
references.pmid: 34949076
references.citation: PLoS One. 2008 Oct 03;3(10):e3325
references.pmid: 18833328
references.citation: Ann Anat. 1996 Jan;178(1):49-60
references.pmid: 8717327