. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 66 Anatomy of the Woodchuck, Marmota monax. Fig. 4-13. Thorax, left lateral view. 1 splenius m., 2 spinalis et semispinalis m., 3 longissimus m., thoracic part, 4 iliocostalis m., thoracic part, 5 diaphragm, left crus, 6 diaphragm, costal part, 7 diaphragm, tendinous center, 8 diaphragm, sternal part. these five the two superficial layers and part of the third layer attach the thoracic limb to the body. The muscles of the first layer are the m. trapezius and m. omotransversarius. Those of the second lay- er are the m. latissimus d
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 66 Anatomy of the Woodchuck, Marmota monax. Fig. 4-13. Thorax, left lateral view. 1 splenius m., 2 spinalis et semispinalis m., 3 longissimus m., thoracic part, 4 iliocostalis m., thoracic part, 5 diaphragm, left crus, 6 diaphragm, costal part, 7 diaphragm, tendinous center, 8 diaphragm, sternal part. these five the two superficial layers and part of the third layer attach the thoracic limb to the body. The muscles of the first layer are the m. trapezius and m. omotransversarius. Those of the second lay- er are the m. latissimus dorsi and m. rhomboideus. Those of the third layer are the m. serratus ven- tralis, m. serratus dorsalis and m splenius. Those of the fourth layer are the m. iliocostalis, m. longis- simus and m. spinalis et semispinalis, and those of the fifth layer are the m. multifidus, m. interspi- nales, m. intertransversarii, and the dorsal muscles of the atlanto-occipital and axio-atlantal joints. Functionally the iliocostalis, longissimus, and transversospinalis muscle groups belong to the M. erector spinae. The muscles that attach the thoracic limb to the body are discussed under the muscles of the tho- racic limb. The dorsal serratus muscle, m. serratus dorsalis (Fig. 4-7), consists of cranial and caudal parts. The cranial part, m. serratus dorsalis cranialis (serratus posterior superior of Bryant, 1945), lies deep to the serratus ventralis muscle, and its fibers run dorsocranially. Origin: By means of a wide aponeurosis from the spinous processes of 2C, from the dorsal median raphae of the neck, and from the spinous processes of 1T-12T. Insertion: Muscular on ribs 4 to 10, just lateral to the iliocostalis muscle. Action: Pulls the ribs cranially during inspira- tion. The caudal part, m. serratus dorsalis caudalis (ser- ratus posterior inferior of Bryant, 1945), lies deep to the latissimus dorsi muscle. Its fibers run cau- doventrally and overlap (lies superficial to) the cau- dal fasc
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