Localization and significance of the nerve entry points and the center of the highest region of the muscle spindle abundance in the lateral muscle group of leg
ZHUO Li-fan,HU Shuai-yu, PAN Yan-mei, KE Zhi-teng, YANG Sheng-bo
Chinese Journal of Clinical Anatomy ›› 2018, Vol. 36 ›› Issue (2) : 121-126.
Localization and significance of the nerve entry points and the center of the highest region of the muscle spindle abundance in the lateral muscle group of leg
Objective To localize the location of the nerve entry points (NEPs) and the center of the highest region of the muscle spindle abundance (CHRMSA) in the lateral muscle group of the leg. Methods Twelve adult cadavers were placed in a side-lying position. The curved lines on skin surface joining the lateral epicondyle and the medial epicondyle of the femur and the lateral epicondyle of the femur and lateral malleolus of the fibula were respectively defined as the horizontal reference line (H) and the longitudinal reference line (L). Cadavers were dissected to expose NEPs; Sihler 's staining was adopted for showing the intramuscular nerve dense regions; HE staining was performed for demonstrate muscle spindles in order to calculate their abundance; barium sulfate was used to label the NEPs and CHRMSAs, and then CT scan. The body surface projection point of the NEP was designated as P, whereas the projection in the opposite direction across the transverse plane was designated as P'. The intersection between the vertical line and line H, and that between the horizontal line and line L through P were designated as PH and PL, respectively. The percentage location of PH and PL on the line H and line L and depth of NEP were determined. Results The PH and PL of the NEP of peroneus longus and peroneus brevis muscles were located at 13.14% and 10.35% of line H and 21.81% and 52.6% of line L, respectively. The depth of NEP was at 50.89% and 25.7% of line PP', respectively. The PH of the CHRMSA of the peroneus longus and peroneus brevis muscles were located at 14.45% and 12.86% of the line H and the PL is at 35.11% and 71.49% of the line L, respectively. The depth were at 18.16% and 20.40% of the line PP', respectively. Conclusion These results should provide an anatomical guidance for accurately localizing the block targets in treatment of spasticity in the lateral muscles.
Lateral leg muscle / Spasticity; Nerve entry point; Intramuscular nerve dense regions / Muscle spindle abundance
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