ANATOMY IN A NUTSHELL. 113 



Action. — Draws thumb towards median line. 

 Xerye Supply. — Eighth cervical through ulnar. 

 Blood Supply. — From the palmar arches. 



LESSOX XXIX. 



Palmaris brevis. — Description. — (Plate XXXI.) — This is a thin, quad- 

 rilateral muscle placed beneath the integument on the ulnar side of the hand. 

 The palmar fascia is in relation with its deep surface and separates it from the 

 ulnar vessels and nerve. 



Origin. — Annular ligament by tendinous fasciculi and palmar fascia. 



Insertion. — Skin on inner border of palm. (Plate XXXI.) 



Action. — Corrugates skin of hand. 



Xera'e Supply. — Eighth cervical through the ulnar. 



Blood Supply. — The ulnar artery. 



Abductor minimi digiti. — Description. — (Plate XXXI.) — This muscle is 

 situa ted on the ulnar border of the palm of the hand. 



Origin. — Pisiform bone and from the tendon of the Flexor carpi ulnaris. 



Insertion. — By two slips, the one into ulnar side of base of first phalanx 

 of little finger: the other into ulnar border of the aponeurosis of the Extensor 

 minimi digiti. (Plate XXVII.) 



Action. — Abducts little finger from middle line of hand. 



Xerye Supply. — Eighth cervical through the ulnar. 



Blood Supply. — The ulnar artery. 



Flexor brevis minimi digiti. — Description. — (Plate XXXI-XXVII.) — The 

 Flexor brevis minimi digiti lies on the same plane as the preceding muscle, on 

 its radial side. It is separated from the Abductor at its origin by the deep 

 branches of the ulnar artery and nerve. This muscle is sometimes wanting; 

 the Abductor is then usually of large size. 



Origin. — From the convex aspect of the hook of the unciform bone and 

 anterior surface of annular ligament. 



Insertion. — Inner side of base of first phalanx of little finger. 



Action. — Flexes little finger. 



Nerve Supply. — Eighth cervical through the ulnar. 



Blood Supply. — The ulnar artery. 



Opponens minimi digiti (Flexor ossis metacarpi minimi digiti). — Descrip- 

 tion. — (Plate XXXI.) — This is a triangular muscle placed immediately 

 beneath the preceding . 



Origin. — From convexity of hook of unciform bone and contiguous por- 

 tion of annular ligament. (Plate XXVII.) 



Insertion. — Whole length of metacarpal of Little finger along ulnar mar- 

 gin. (Plate XXVII.) 



Action. — Draws fifth metacarpal forward so as to deepen hollow of palm. 



Nerve Supply. — Eighth cervical through ulnar. 



Blood Supply. — Ulnar artery. 



Lumbrieales. — Description. — (Plate XXXI) — The Lumbricales are four 

 small fleshy fasciculi, accessories to the deep Flexor muscle. 



