. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPTILIA. 281 The flexor brevis digitorum gives off a slip to each of the three middle toes. Myology of Ophidian Reptiles, Muscles of the Spine. — In serpents, as might be expected, the muscles of the spine are very completely developed, and easy to identify. The spinalis dorsi arises from the lateral surface of the spinous processes of the verte- brae, and likewise receives tendons of rein- forcement from the longissimus dorsi, which spread out and are lost upon its inferior sur- face ; this muscle divides itself intern
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. REPTILIA. 281 The flexor brevis digitorum gives off a slip to each of the three middle toes. Myology of Ophidian Reptiles, Muscles of the Spine. — In serpents, as might be expected, the muscles of the spine are very completely developed, and easy to identify. The spinalis dorsi arises from the lateral surface of the spinous processes of the verte- brae, and likewise receives tendons of rein- forcement from the longissimus dorsi, which spread out and are lost upon its inferior sur- face ; this muscle divides itself internally into as many fasciculi as there are vertebras, each fasciculus terminating in a very long tendon, which runs in an aponeurotic sheath to be inserted into the spinous process of the ver- tebra to which it is destined. The longissimus dorsi arises by fleshy fibres from the extremities of the articular apo- physes, which here perform the office of transverse processes. These slips, after having become united with each other, give off two sets of tendons, one of which runs obliquely to assist in giving origin to the spinalis dorsi; the others descend in like manner, and constitute the only tendons of origin of the sacro-lumbalis, so that this mus- cle cannot be said to have any direct insertion upon the vertebral column. The sacro-lumbalis arises from the tendons of the longissimus dorsi just described, and divides itself externally into slips, each of which is inserted by a slender tendon into the posterior edge of the upper third of one of the ribs. Under the spinalis dorsi is found the semi- spinalis (transverso-spinalis), and beneath this the interspinalis. On the inferior aspect of the vertebral column there is found a muscle in all respects analogous to the longus colli, except as re- gards its extent, and which might be called the transverso-spinalis inferior : this extends from the inferior spinous process of one vertebra to the transverse processes of the second an
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