. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Fig. 2-36. Left forepaw, palmar view. I-V = metacarpals, 1-5 = digits. 1 radius, 2 intermedioradial carpal bone (sca- pholunatum), 3 radial sesamoid, 4 proximal phalanx of sec- ond digit, 5 middle phalanx of second digit, 6 distal pha- lanx of second digit, 7 flexor tubercle, 8 distal sesamoid, 9 proximal sesamoid, 10 accessory carpal bone (pisiform), 11 ulnar carpal bone (triquetrum), 12 ulna. The pubic bone forms the cranial and medial borders of the obturator foramen, foramen obtura- tum. The ischium, os ischii, forms the cauda
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Fig. 2-36. Left forepaw, palmar view. I-V = metacarpals, 1-5 = digits. 1 radius, 2 intermedioradial carpal bone (sca- pholunatum), 3 radial sesamoid, 4 proximal phalanx of sec- ond digit, 5 middle phalanx of second digit, 6 distal pha- lanx of second digit, 7 flexor tubercle, 8 distal sesamoid, 9 proximal sesamoid, 10 accessory carpal bone (pisiform), 11 ulnar carpal bone (triquetrum), 12 ulna. The pubic bone forms the cranial and medial borders of the obturator foramen, foramen obtura- tum. The ischium, os ischii, forms the caudal part of the os coxa, and consists of a body and a ramus. It forms the caudal and lateral borders of the obtu- rator foramen. The body of the ischium, corpus ossis ischii, fuses with the ilium, acetabular bone and pu- bis at the acetabulum. It has a low ischiatic spine, spina ischiadica, and caudal to that a lesser ischiatic notch, incisura ischiadica minor, for the tendon of the internal obturator muscle. The caudal, flattened part of the ischium forms the tabula, tabula ossis ischii. The latter bears the ischial tuberosity, tuber ischiadicum, for the attachment of the caudal thigh muscles. The ischial ramus, ramus ossis ischii, pro- jects ventromedially from the caudal part of ischial body and fuses with the caudal branch of the pubic. Fig. 2-37. Pelvis, oblique caudodorsal view. 1 auricular face, 2 sacral tuber, 3 major ischiadic incisure, 4 body of ilium, 5 ischiadic spine, 6 minor ischiadic notch, 7 obturator foramen, 8 ischial tuberosity, 9 ischial ramus, 10 caudal ra- mus of pubis, 11 cranial ramus of pubis, 12 iliopubic emi- nence, 13 acetabular fossa, 14 articular surface, 15 tubercle for the rectus femoris muscle, 16 gluteal line, 17 gluteal surfaces, 18 tuber coxae. bone. It does not, however, contribute to the for- mation of the pelvic symphysis. The left and right ischial rami collectively form the ischial arch, arcus ischiadicus. The angle of the ischial arch of
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