OCR Text |
Show 694 MR. F. G. PARSONS ON T H E [June 16, There is no Scalenus anticus ventral to the subclavian artery and brachial plexus. The Scalenus brevis rises from the posterior two or three cervical transverse processes and is inserted into the first rib behind the vessels. The Sccdenus longus rises with the last and is inserted into the outer surfaces of the 2nd, 3rd, and 4th ribs. The Bectus capitis anticus major rises from the 3rd to the 7th cervical transverse processes as well as, by an internal origin, from the bodies of the anterior four thoracic vertebrae. Its insertion is normal. On the outer side of the last muscle, separated by it from the longus colli, is a muscle which rises from the ventral part of the posterior four cervical transverse processes to be inserted into the body of the axis and the ventral arch of the atlas. The Longus colli is normal, and extends as far back as the 4th thoracic vertebra. The Bectus capitis anticus minor and lateralis are normal; the former comes from the transverse process of the atlas, lying external to the major, and ventral to the rectus lateralis. The Splenius capitis is normal and entirely covers the complexus. The Splenius colli is continuous with the last, and is inserted into the transverse processes of the anterior three cervical vertebrae. The Trachelo-niastold is very well developed; it is inserted into the outer part of the curved line of the occipital bone, into the para-mastoid process, and into the transverse processes of the anterior cervical vertebrae. Its insertion is tendinous, and there are two other tendinous intersections further back. The Transversalis colli is large and is inserted into the posterior five cervical transverse processes. The Cervicalis ascendens is inserted into the last three cervical transverse processes. The Rectus capitis posticus major is distinctly bilaminar, a con-r dition I have also found in the Guinea-pig \ Muscles of the Anterior Extremity. The Trapezius rises, as in the Great Kangaroo and Bennett's Wallaby, from the ligamentum nuchae and anterior six thoracic spines ;' it has a continuous fleshy origin except opposite the first thoracic spine, where it is aponeurotic. It is inserted into the clavicle as far as the origin of the cleido-mastoid, into the acromion, the spine of the scapula, and the fascia over the infraspinatus. • , Q , The Latissimus dorsi rises from the 5th, 6th, /th, ana »tn 1 Proceedings of the Anatomical Society, February 1892, p. x. |