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Show 370 PROF. K. VON BARDELEBEN ON THE [Apr. 17, c. RODENTIA. 1. SCIURUS ARIZONENSIS. (Plate XXI. fig. 4.) (Zool. Soc. Gardens.) The nerv. plantaris medidlis supplies all 5 toes except only the outer half of the 5th. A n abductor (extensor) prcehallucis (tibialis medialis) (v. Bathyergus) is present; it takes origin from the inner (tibial) surface of the tibia and ends in the Ph.; the muscle is covered in by the tibialis posticus. Nerv. tibialis. The plantaris arises in common with the lateral head of the gastrocnemius; it is a little fixed on the calcaneum and ends in four tendons, which are provided with a weak fleshy belly each ( = lumbriccdes ?). 2. SCIURUS NIGER. a. Flexores. The gastrocnemius is a two-headed, strong, and flat muscle; it is inserted into the tuberos. calcan. The plantaris is large; it arises from the external condyle, becomes tendinous near the calcaneum, where it is fixed by connective tissue, and is inserted by four tendons into toes 2-5. These tendons are cleft and perforated by those of the flexor longus. A muscle (soleus?) taking origin from the capitulum fibulae joins the tendon of the gastrocnemius. The two flexores longi are united into one muscle coming from the tibia and fibula and ending in five tendons. One tendon of the flexor communis joins the tendon of the plantaris which goes to the 5th toe. There are present four large lumbricales muscles. The tibialis posticus is inserted into the naviculare tibiale. The abductor (extensor) prcehallucis (tibialis medialis) arises from the internal surface of the tibia (in the upper half) and is inserted into the Ph. and the first metatarsal bone and phalanx I. of the hallux. There are five flexores breves profundi. 8. Extensores. The tibialis anticus is so very large that it covers the ext. hall. I. and ext. dig. com. I. in the upper part of the leg. There are four peroncei muscles :-(1) the peronceus longus ; (2) the peronceus brevis, both very strong; (3) the peronceus " tertius," arises from the fibula (upper end) and goes to the capitulum metatarsi quinti ; (4) the peronceus " quartus" takes origin from the middle and lower third of the fibula and joins the outer border of the extensor digitorum brevis. The extensor brevis goes to toes 2-5, the tendon to the fifth toe being very delicate. |
