J. Playfair MeMurrich 499 
rived from the flexor brevis superficialis is entitled to be known as the 
{iexor brevis pollicis. 
11. The interosseus primus volaris of Henle is correctly so named, and 
there are typically four palmar interossei in the human hand. 
12. The derivation of the palmar muscles of the human hand from 
the various layers may be tabulated as follows: 
Flexor brevis superficialis—Palmaris brevis, abductor quinti digiti, oppo- 
nens quinti digiti, flexor brevis quinti digiti, abductor pollicis, opponens 
pollicis, flexor brevis pollicis. 
Flex. brevis med. str. superficiale—The lumbricals. 
Fiex. brevis med. str. profundum.—The adductor pollicis. 
Flex. brevis profundus.—The interossei volares, the interossei dorsales 
(in part). 
Intermetacarpales.—The interossei dorsales (in part). 
REFERENCES. 
1900. K. von BARDELEBEN.—Muskeln und Muskelmechanik. Ergebn. fiir 
Anat. und Entwick., IX, 1900. 
1902. K. von BARDELEBEN.—Muskeln und Muskelmechanik. Ergebn. fiir 
Anat. und Entwick., XI, 1902. 
i886. H. Sr. J. Brooks.—Variations in the nerve supply of the flexor brevis 
pollicis muscle. Journ. of Anat. and Phys., XX, 1886. 
1886. H. Sr. J. Brooks.—On the morphology of the intrinsic muscles of 
little finger, with some observations on the ulnar head of the 
short flexor of the thumb. Journ. Anat. and Phys., XX, 1886. 
1887. H. Sr. J. Brooks.—Variations in the nerve supply of the lumbrical 
muscles in the hand and foot, with some observations on the 
innervation of the perforating flexors. Journ. Anat. and Phys., 
XXI, 1887. 
1878. D. J. CUNNINGHAM.—The intrinsic muscles of the hand of the Thy- 
lacine (Thylacinus cynocephalus), Cuscus (Phalangista maculata) 
and Phascogale (Phascogale calura). Journ. Anat. and Phys., XII, 
1878. 
1882. D. J. CUNNINGHAM.—Report on some points in the Anatomy of the 
Thylacine (Thylacinus cynocephalus), Cuseus (Phalangista maculata) 
and Phascogale (Phascogale calura) collected during the voyage 
of H. M. S. Challenger in the years 1873-76; with an account of 
the intrinsic muscles and the nerves of the mammalian pes. 
Scient. Results, Voyage of H. M. S. Challenger, Zool., V, 1882. 
1882. D. J. CUNNINGHAM.—The relations of nerve-supply to muscle homol- 
ogy. Journ. Anat. and Phys., XVI, 1882. 
1887. D. J. CunntncHAM.—The flexor brevis pollicis and the flexor brevis 
hallucis in man. Anat. Anzeig.,- II, 1887. 
1902. D. J. CuNNINGHAM.—Text-book of Anatomy. Edinb. and London, 
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