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Subclavius.
THis is called the Subclavius which is seated under the Clavicle,* 1.1 and lodgeth between the first Rib of the Thorax; This is accounted the first Muscle of the Thorax, it ariseth from the Inferior part of the Clavicle, and being enlarged forwards with Oblique and ••ransverse Fibres, it is implanted into the first Rib near the Sternon, and by drawing it upwards and outwards, doth dilate the Thorax.
The use of this Muscle is for drawing down the Clavicle,* 1.2 when it is moved upwards with the Scapula, for when the Sca∣pula's are attolled, the Clavicles are lifted up with them, the which to reduce into their proper places, the Subclavius is to be brought downwards; and hence in Fractures of the Clavicles, if they be fractured near the Sternon, the Arm with the Scapula does soon fall downwards, and that part which is next the Sternon doth ascend and is raised upwards, as Hippocrates doth observe, Lib. de Fractur. and on the contrary, if they be broken near the Acromium, you will find neither part to ascend: the cause of which, the same worthy Anthor doth fortifie with this ingenious Reason; Whereas this Muscle is inserted to that part which is next the Acromium, when the Clavicle is fractured two ways, this Subclavian Muscle is presently contracted; and thus the Arm draws the dependent Scapula together with its self, whilst the other part is detained in its place by the strength of the Muscle.
F. Shews this, Tab. 11.