. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 16 Anatomy of the Woodenuck, Marmota monax. Fig. 2-6. Skull, dorsal view of an immature animal, rietal bone, 2 interparietal bone, 3 occipital bone. 1 pa- animal it is visible on the surface of the skull 10 mm wide and 8 mm long. It cannot be identified externally on the skull of a mature animal. The interparietal bone is overgrown by the pa- rietals that meet on the midline as the external sag- ittal crest. Temporal bone, os temporale (Figs. 2-5 and 2-7), is paired, each consisting of squamous, petrous and tympanic parts. The squ
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 16 Anatomy of the Woodenuck, Marmota monax. Fig. 2-6. Skull, dorsal view of an immature animal, rietal bone, 2 interparietal bone, 3 occipital bone. 1 pa- animal it is visible on the surface of the skull 10 mm wide and 8 mm long. It cannot be identified externally on the skull of a mature animal. The interparietal bone is overgrown by the pa- rietals that meet on the midline as the external sag- ittal crest. Temporal bone, os temporale (Figs. 2-5 and 2-7), is paired, each consisting of squamous, petrous and tympanic parts. The squamous part, pars squamosa, forms the caudolateral portions of the cranium. It has a large zygomatic process, processus zygomaticus, which joins the temporal process of the zygomatic bone to form the zygomatic arch. The root of the zygo- matic process has a large ventral concave area, the mandibular fossa, fossa mandibularis (Fig. 2-8), which bears the articular surface for the mandible. A large retroarticular foramen, foramen retroarti- culare (Figs. 2-5 and 2-7), for the passage of blood vessels lies caudal to the root of the zygomatic pro- cess, and the caudoventral border of the bone bears a shallow tympanic incisure for the tympanic bulla. The squamous part fuses dorsally with the parietal bone, rostrally with the frontal bone and rostrally and rostroventrally with the wing of the basisphe- noid bone. Caudoventrally it fuses with the tym- panic and petrous parts of the temporal bone and caudodorsally with the occipital bone (Fig. 2-7). The fusion of the petrous and squamous parts of the temporal bone completes the ventrolateral part of the nuchal crest. The temporal bone of the woodchuck does not have distinct retroarticular and retrotympanic processes. The tympanic part of the temporal bone, pars tympanica, forms the caudoventral part of the cra- nium between the basioccipital ventrally and the supraoccipital bone dorsally (Fig. 2-8). Dorsolat- erally it has a large openin
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Keywords: ., bookcollectionbiodiversity, booksponsorbiodi, booksubjectmammals
