. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 149 In the ordinary course of the dissection of the supraclavicular triangle, it was noticed that the Omo-hyoid seemed to possess only an anterior belly. This was attached behind the Clavicle at the outer border of the Sterno-mastoid to a band of fibrous tissue covering the posterior aspect of the bone. On disarticulating the Clavicle at its inner end and pulling it forwards, this fibrous tissue showed an inter- mixture of muscular fibres. This was the more evident at its outer extremity where it was continuous with the Trape
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 149 In the ordinary course of the dissection of the supraclavicular triangle, it was noticed that the Omo-hyoid seemed to possess only an anterior belly. This was attached behind the Clavicle at the outer border of the Sterno-mastoid to a band of fibrous tissue covering the posterior aspect of the bone. On disarticulating the Clavicle at its inner end and pulling it forwards, this fibrous tissue showed an inter- mixture of muscular fibres. This was the more evident at its outer extremity where it was continuous with the Trapezius above and the Subclavius below. The Subclavius muscle was strongly developed, and though some of its fibres were continuous with the retro-clavicular band, by far the greater part of the muscle received insertion normally into the groove on the under aspect of the Clavicle. Lying below the Subclavius, and entirely distinct from it, was a narrow muscular belly, which, like the Subclavius, but below it, took origin from the cartilage of the first rib. Running outwards along the lower border of this muscle it was attached laterally to the upper border of the Scapula, immediately behind the Suprascapular notch. These features of the case are figured in the schematic drawing con- structed to illustrate it. Unfortunately it was impossible to demonstrate the origin of the nerve supplies to the various muscular slips, these having been injured during the previous dissection. The abnormality of the Omo-hyoid is by no means an uncommon one; it constitutes a definite reversional variation. The fibro-muscular band stretching behind the Clavicle from Sterno-mastoid to Trapezius doubtless represents a remnant of the continuous sheet from which these muscles are derived. The accessory belly below the Subclavius is however less easy to explain. Its lateral attachment coincides exactly with that usual for the posterior belly of the Omo-hyoid (which however is a variable quantity). If it is
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