*5.19.2 The extensors of the tarsal joint and flexors of the digits*

• M. gastrocnemius: The lateral and medial heads of the gastrocnemius muscle arise from the lateral and medial epicondyle of the femur, respectively. A sesamoid

#### **Figure 38.**

*Lateral view of the lower leg musculature (left hind limb). A: superficial layer, B: deeper layer, C: deepest layer. 1: m. biceps femoris, 2: m. semitendinosus, 3: m. gastrocnemius caput laterale, 4: m. tibialis cranialis, 5: m. extensor digitorum longus, 6: m. fibularis longus, 7: m. fibularis brevis, 8: m. tibialis caudalis, 9: m. plantaris, 10: m. soleus, 11: m. extensor digiti primi (hallucis) longus.*

#### **Figure 39.**

*Medial view of the lower leg musculature (left hind limb). A: superficial layer, B: deeper layer, C: deep layer, D: deepest layer. 1: m. sartorius, 2: m. gracilis, 3a: m. gastrocnemius caput mediale, 3b: m. gastrocnemius caput laterale, 4: m. soleus, 5: m. plantaris, 6: m. flexor digitorum tibialis, 7: m. tibialis cranialis, 8: m. popliteus, 9a: m. semimembranosus accessorius, 9b: m. semimembranosus proprius, 10: m. tibialis caudalis.*

*Anatomy of the Rhesus Monkey (*Macaca mulatta*): The Essentials for the Biomedical Researcher DOI: http://dx.doi.org/10.5772/intechopen.99067*

#### **Figure 40.**

*Dorsal view of the musculature of the left foot. A: superficial layer, B: deep layer. 1: retinaculum proximalis, 2: retinaculum distalis, 3: m. tibialis cranialis (two bellies), 4: m. extensor digitorum longus, 5: m. extensor digiti primi (hallucis) longus, 6: m. adductor digiti primi (hallucis), 7:m. extensor digitorum et digiti primi (hallucis) brevis, 8: m. abductor digiti quinti, 9: mm. interossei.*

bone is present in each tendon of origin (ossa sesamoidea m. gastrocnemii or fabellae). The tendo Achilles attaches to the tuber calcanei (**Figures 25**, **26**, **36**, **38**, and **39**).


#### **Figure 41.**

*Plantar view of the musculature of the left foot. A: middle layer, B: deep layer. 1: m. quadratus plantae, 2: m. flexor digitorum (longus) tibialis, 3: m. flexor digitorum (longus) fibularis (tendon to digit I), 4: m. abductor digiti primi (hallucis), 5: m. flexor digiti primi (hallucis) brevis, 6: m. adductor digiti primi (hallucis), 7: m. flexor digiti quinti brevis, 8: mm. lumbricales, 9: mm. contrahentes digitorum pedis, 10: mm. interossei.*

